1000+ Head-Fier
Triple Duality
Pros: The best Tempotec sound in one dongle: Dual DAC CS43131, dual output SE 3.5mm and BAL 4.4mm, dual volume button.
- Possibility to change the sound profile via firmwares.
- Adequate size, sober construction, efficient, attractive and effective.
- It's a wireless pickup, unlike its brothers E35 and E44.
- Good power level.
- 60 volume steps.
- Great quality/sound/price ratio.
- ASIO drivers.
Cons: No gain selector.
- Perhaps not the most powerful dongle in its class.
- For iPhone it is necessary to purchase a separate Lightning to Type-C OTG cable.

Tempotec is known for its long history of pursuing the best sound quality, and the most convenient user experience. Well known for its dongles, it now continues to squeeze the double DAC CS43131, adding a professional FPGA and 3 high-performance oscillators to achieve low latency and high precision data transfer capability. It supports up to DSD256, 32Bit/384kHz PCM and high-resolution MQA and lossless music. It has 3.5mm SE and 4.4mm BAL outputs. RGB light indicates operating status. Two physical buttons facilitate volume control. It has an SNR that reaches 131dB, with a THD+N of 0.00012% and achieves up to 280mW at 32Ω through the balanced output. Its power consumption is very low and it can play for up to 35 hours on a 4000mAh battery. Finally, its body is metallic and has a transparent window through which you can see its circuitry. In addition, Tempotec has an ace up its sleeve, as it allows the sound profile to be modified by means of firmwares. Let's take a closer look at what the new Tempotec Sonata BHD Pro has to offer.

Tempotec BHD Pro 01_r.jpgTempotec BHD Pro 02_r.jpgTempotec BHD Pro 03_r.jpg


  • Model: Sonata BHD Pro.
  • DAC used: 2*CS43131
  • SNR: 131dB.
  • THD+N: 0.00012%.
  • Maximum output level: 2V RMS SE. 4V RMS BAL.
  • Power: 280mW/32Ω balanced output.
  • Volume control: Physical + and - buttons. 60 volume steps.
  • DSD: DSD64~DSD256.
  • PCM: 16Bit 44.1kHz-32Bit 384kHz.
  • MQA: Native.
  • LED: Operating status.
  • Headphone ports: BAL 4.4mm, SE 3.5mm.
  • Dimensions: 55x21x11mm.
  • Weight: 18g.
  • Material: Aluminium.

Tempotec BHD Pro 04_r.jpgTempotec BHD Pro 05_r.jpg


The Tempotec Sonata BHD Pro comes in a small cardboard box painted black. Its packaging is very reminiscent of the previous March III where the cardboard waves can be seen through the paint. The dimensions are 107x97x42mm. The box opens up like a flap box and on the upper side is the name "Sonata" in orange and on the top is the brand logo, towards the left side. On the back is the brand name in white lettering, while on the bottom right is a sticker with the model name and colour. The brand logo is repeated on the closing tab and on the back it appears again, this time accompanied by the name of the series, Sonata, of course. After opening the box there is a transparent plastic sheet protecting the product packaging. The BHD Pro is encased in a black foam mould. Below it there is another level containing the rest of the accessories. In a nutshell:

  • The Tempotec Sonata BHD Pro dongle.
  • A cloth pouch.
  • A warranty certificate.
  • One warranty card.
  • A user manual.
  • A thank you card from the company.
  • One short silver-plated copper male-to-male USB Type-C cable.
  • One USB Type-C female to Type-A male adapter.

The packaging is relatively small, with a sober presentation, in line with the previous March III. It is appreciated that it comes with a cloth pouch for storage. The cable is short as it is intended for use with mobile devices.

Tempotec BHD Pro 06_r.jpgTempotec BHD Pro 07_r.jpg

Construction and Design

The BHD Pro is made of textured aluminium. In my case its colour is called titanium grey. It is a tablet whose upper face has two levels separated by a rounded edge. The upper side is shorter and features the brand logo and the name in white ink. On the lower face is a transparent window, flanked by a black border which reads "Dual Osc FPGA" in gold lettering. The window allows a view of the interior, the oscillators and the FPGA, as well as some of the circuitry. A little closer to the bottom edge is a horizontal slit that allows the light from the bottom LED to exit. On the side near the letters is a physical, rocker-mode double knob that controls the volume. The + button is in the centre, while the - button is closer to the USB connection. The USB connector is Type-C. At the other end there are two audio outputs, SE 3.5mm and BAL 4.4mm gold-plated. The underside is a cover that has two screws for closure. At its centre is the MQA logo and the Hi-Res Audio logo in white ink.
The dimensions of the dongle are 55x21x11mm. At the thinnest side it measures 10mm. Its weight is 18g.
Its design combines sharp edges with more vivid ones, located on the face of the window. The face of the window is the one that allows you to see the inside of the electronic circuit and its moderate size. In reality, the design of the BHD Pro continues to maintain a classic and sober air of the brand, without great fanfare, something more modern and attractive, but without being very striking in this aspect.
The level of construction and solidity of the product is very good and, without a doubt, it is not weak in any way, but rather robust, even in the window area.

Tempotec BHD Pro 08_r.jpgTempotec BHD Pro 09_r.jpg


The BHD Pro is compatible with PC, Android Smartphones and iPhone. It can be used with PC and Android with the standard cable. For iPhone it is necessary to purchase a separate Lightning to Type-C OTG cable. For Windows 10 no additional driver is required and ASIO driver is available. Allows exclusive mode with the HiBy Music APP. MQA certified.

Tempotec BHD Pro 10_r.jpgTempotec BHD Pro 11_r.jpg


The BHD Pro has a 60-step volume control. It supports PCM from 16Bit 44.1kHz up to 32Bit 384kHz, DSD64 up to DSD256. It also supports MQA. It has ASIO drivers. Connects in exclusive HQ USB Audio mode with the HiBy Music APP. It has a multi-coloured LED status indicator:

  • Red: Connected, paused.
  • White: DSD64~DSD256.
  • Violet: MQA (TIDAL music application).
  • Yellow: 32kHz~48kHz playback.
  • Cyan: 64kHz~192kHz playback.
  • Orange: Playback >=352.8 kHz.

It has USB Type-C input and 3.5mm SE and 4.4mm BAL outputs.
It works smoothly whether connected to a PC, SmartPhone, DAP or PAD. It only heats up if the output volume is high, something that I was able to verify when I carried out the power tests. Although the temperature was not high and it is necessary to take into account an ambient temperature of 27ºC during the tests. I didn't experience any dropouts during playback, nor did I experience any clogging. The volume steps start with small jumps, which get bigger as they get closer to the maximum.

Tempotec BHD Pro 12_r.jpgTempotec BHD Pro 13_r.jpg


There is no gain selector. 2V RMS at no load, by SE 3.5mm and 4V RMS at no load, by BAL 4.4mm.
To make the measurements I have connected the BHD Pro connected to my PC using foobar2000 and pure amplitude 1 tones created with Audacity.
The oscilloscope used for this occasion is the new VIMU MSO21, a two-channel 12-bit USB oscilloscope with logic analyser, digital inputs/outputs and DDS. It can be used as a spectrometer, data recorder, logic analyser, etc. Works on PC, including Android. It has a vertical resolution of 12bits, giving it 4096 levels of resolution. You can find more information about the oscilloscope used here:


No Load SE

2V RMS over the entire frequency range.

Tempotec BHD Pro SE No Load.png

15 Ω SE

1.223V for 15Ω means 100mW and a current of 81mA. A great value.

Tempotec BHD Pro SE 015.png

33 Ω SE

With the 81mA it is capable of delivering for 15Ω I expected a great value for 33Ω. But the BHD Pro delivers 1.65V RMS, which is 82.5mW and 50mA. It falls a bit short compared to the performance for 15Ω.

Tempotec BHD Pro SE 033.png

100 Ω SE

I was expecting the BHD Pro to deliver full voltage for this impedance value, but it falls a little short at 1.91V, which is a delivery of 19mA and 36.5mW.

Tempotec BHD Pro SE 100.png

No Load BAL

Clean 4V RMS across the entire frequency range.

Tempotec BHD Pro BAL No Load.png

15 Ω BAL

Strange behaviour by BAL for 15Ω, well below the performance by SE. 0.828V RMS, which is 46mW and 55mA.

Tempotec BHD Pro BAL 015.PNG

33 Ω BAL

We continue with the strange behaviour of the BHD Pro, but now for the better. For the 33Ω per BAL you get 1.83V RMS, which is 100mW of power. The brand specifies 280mW for 32Ω, which would mean a delivery of 3V RMS, with an amount of current of 93.5mA, exceeding the limit of those "mythical" 90mA. As you can see, it's a bit far, but it's a good value.

Tempotec BHD Pro BAL 033.png

On the other hand, I anticipate some questions that may be asked by amateurs who have read other reviews made with more professional measuring devices. In that review, 137mW is reached at 33Ω, which means a voltage of 2.13V RMS. I understand that this measurement has been made with a pure 1khz sinusoidal tone. As can be seen in the following measurement, the BHD goes up to 2.33 VRMS. But if a 20Hz tone is played at the same volume, the distortion is very evident. My measurements try to find the maximum RMS voltage value over the whole frequency range. I think it's no use if at 1kHz it gives a spectacular measurement if the bass is completely distorted, as it is in this example.

Tempotec BHD Pro BAL 033 Max 1kHz.pngTempotec BHD Pro BAL 033 Max 20Hz.png

100 Ω BAL

Again, the BHD Pro fails to deliver the full voltage for 100Ω, staying at 3.6V RMS, which implies a power of 130mW and 36mA. Not a bad value at all.

Tempotec BHD Pro BAL 100.png

Frequency Response

Totally flat from 20Hz to 40kHz, even at different volumes. The R and L graphs overlap, there is no difference between channels. The roll-off between 5Hz and 20Hz is very small, while the roll-off between 10Hz and 20Hz is not noticeable. This is definitely a Hi-Res product.

Tempotec Sonata BHD Pro.png


The Tempotec Sonata BHD Pro has the possibility to alter its sound signature through the use of different firmwares. At the time of writing this review, from the Tempotec website, you can download firmware version 1.01. This package contains two firmwares: S-BHDPRO-HMN1.01.bin and S-BHDPRO-HMF1.01.bin. The firmware ending with F1.01 is the default version. The N1.01 version has a "different sound style". I have tried both, the operation is simple but it takes a few minutes and it is possible that the memory of each sound profile is lost in that time. It is true that there is a difference in sound, but it is not night and day. I think the N1.01 version is somewhat warmer and the F1.01 is more neutral, within a sound that is already subtly warm in itself.
Tempotec has accustomed us to a clean, neutral sound and is already an expert at using the Cirrus CS43131 DAC in a dual setup. It has added an FPGA to expand the possibilities of the sound already showcased in the larger E35 and, above all, E44 dongles. Tempotec needed to combine the two models into one and add a bit of novelty to them. And it has succeeded, even though the power performance is almost the same for both models. I think the E44 is somewhat cleaner and more neutral, with a subtly wider sound. Although it may also be a bit suggestive of the good regard I have for it. Going back to the Sonata BHD Pro, it has 60 volume steps, although the voltage jumps in the last steps are slightly high. But that's not uncommon for powerful sources. 100 steps would have been very appropriate, or at least, a button to use low/high gain.
One of the things I prefer about the E models is that it is a wireless tablet and its design has improved compared to those, being more elegant and eye-catching, although within the sobriety that Tempotec is used to.
As I said, the profile of the BHD Pro is neutral but subtly warm and pleasant. It has an organic and realistic tone. It is not spectacular or analytical, but moves in a melodious and effective environment. I don't mean it's soft because it breaks and rips when it needs to. It has a good drive starting from the low end, although there is a subtle colouring in the lower frequencies, where the sound is less sensory than audible, perhaps that makes the sound warmer. This sensation is something that I was able to verify by comparing it with the xDuoo Link2 Bal, whose sound is a bit deeper. In terms of power I feel the same, the punch is powerful and energetic. The volume occupied is large and the capacity for resolution, layering and breakdown of complex bass lines is very good, at the level of the xDuoo.
The vocals have a subtly sweet sonority, which makes them more organic, natural and appealing. In this respect the xDuoo is a little more nondescript and neutral, while the BHD Pro adds a melodious edge that is more pleasing. Instrumentation is clear, noticeably separated, accurate and full in resolution, but not analytical. With respect to the xDuoo, again that subtle warmth gives the sound a more pleasing, less incisive feel that makes it more pleasing, captivating and euphonic. The level of detail and resolution is very good, as good as the xDuoo and that's saying a lot for the performance for the price of this little BHD Pro.
The treble is quite crisp, clear, transparent and clean. They retain that natural flavour that is never crisp and remains delicate and delicious in equal parts. The BHD Pro, in this sense, is a very suitable dongle for long listening. And, as you can see from the measurements, the treble extension is full and there is no drop or loss of energy in the high end, maintaining an excellent sense of air at all times.
The scene is big, as big as the xDuoo can offer, and I even find it a little calmer, a quieter sound that gives it a slightly superior vaporous and transparent feel. As I said, the level of detail is quite descriptive, but without losing the organic and natural character that determines it. But it also offers a vivid and expressive temperament, which adds a higher level of expansiveness. It is effective in the positioning of the image and the distribution of the elements. It has a high level of resolution to arrange the notes and present them clearly, without any opacity, achieving a notable separation of the components and a dark background between them.

Tempotec BHD Pro 14_r.jpgTempotec BHD Pro 15_r.jpg


It's amazing what Tempotec can do for so little money. The Sonata BHD Pro seems like a trivial product, one more in the brand's long list of dongles. However, it tries to fill a gap in their catalogue, a mix between the E35 and the E44 with its Dual CS43131, with both outputs, a smaller body, no cables and with the addition of an FPGA that allows the use of different firmwares capable of modifying the sound. This is certainly something that sets it apart from the competition and goes beyond the filters that are built into ESS DACs. At the moment there are two sound styles, but there could be more, which would make this small device even more attractive. In terms of power level it does not go beyond its smaller siblings, although it has the necessary power to drive a large catalogue of headphones with sufficient authority. My measurements will tell you that.
Its level of construction is sober, a trademark of the company, but robust and faultless. Its design is a little different from the established Tempotec design and it is true that it can remind us of other models, with that transparent window towards the inside. Sound buttons are a must, and the BHD Pro has them, with 60 volume steps. There is also a status LED, which has become essential for the information it provides. Of course, the ASIO driver is also available right out of the box. All this makes the new BHD Pro possibly the dongle with which Tempotec should bid farewell to the Dual CS43131 that it has been so successful with. And it would do so in style.

Tempotec BHD Pro 16_r.jpgTempotec BHD Pro 17_r.jpg

Earphones and Sources Used During Analysis

  • Hidizs AP80 PRO-X Red Copper LE
  • Xiaomi Redmi Note 8 Pro
  • ISN H40
  • Hidizs MP145
  • Hidizs MS5
  • KiiBOOM Allure
  • KiiBOOM Evoke
  • 7Hz Sonus
  • Rose QT9 MK2

Tempotec BHD Pro 18_r.jpgTempotec BHD Pro 19_r.jpg

Tempotec offered me this model, in exchange for writing an honest review. I want to make it clear that all my opinions written in this review have not been conditioned by this fact, nor will I ever write anything that I do not really think or feel here. I will only write about my personal opinion in relation to the revised product.

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Purchase Link

Tempotec BHD Pro 22_r.jpgTempotec BHD Pro 23_r.jpg

You can read the full review in Spanish here

Tempotec BHD Pro 24_r.jpgTempotec BHD Pro 25_r.jpg
Very deep review.
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Mark K
Mark K
I have mine. The first impression is that it's power output is very low.

K othic

New Head-Fier
Pros: Robust build
Large number of volume steps
More than sufficient power for portable use
Good stock firmware
Cons: Slightly warm signature (not all IEMs will benefit from this)
Could have a more competitive price
Unbalanced output is not sufficient to amplify demanding headphones (nitpick)
TempoTec Sonata BHD Pro: powerful with a touch of warmth



As the Sonata HD PRO was my first dongle, I have a great appreciation for the TempoTec brand, and today I'm pleased to bring you my review of their latest dongle: the BHD Pro, which at $89 USD aims to compete with well-known dongles such as the Truthear Shio ($69) and the Tanchjim Space ($89).

TempoTec BHD Pro Unboxing: BHD Pro Unboxing Short

Check out previous reviews here (or in spanish here)


Unboxing, Build & Accessories


Device: similar in size to the Sonata HD PRO (length: 5.5cm, width: 2.1cm, depth: 1cm (USB-C connection area) – 1.1cm (3.5mm and 4.4mm port area)).





Construction entirely in aluminum with a transparent zone that allows observing the two chips that make up the BHD Pro (both CS43131). Volume button on the left side (approximately 50 steps). RGB LED strip indicating the quality of the audio being played.


USB-C to USB-C cable - USB-C to USB-A adapter - Carrying pouch

Functionality & Performance

Sound Profile

The BHD Pro is a dongle that imparts warmth to the sound signature. It doesn't overly color the signature, but the elevation of the bass in different headphones is noticeable.


This new TempoTec device aims to enter the market where the Shio and Space belong by offering more power for a similar price. What do I mean by this? The BHD Pro has two outputs (3.5mm and 4.4mm) just like the Shio, but it boasts double the power of the latter (Truthear Shio - > 3.5mm: 55mW@32ohms – 4.4mm: 150mW@32ohms - TempoTec BHD Pro - > 3.5mm: 140mW@32ohms – 4.4mm: 280mW@32ohms). Additionally, it provides around 50mW more power in its balanced output compared to the Tanchjim Space, both being available at the same price.

todo auris.png

In terms of testing:

The 7Hz Salnotes Zero is the “easy” test once again. With the BHD Pro at maximum volume and only 3 steps of volume on my phone, the Zero gains enough dynamics to be highly enjoyable. In my opinion, the 4.4mm output isn't necessary in this case, but for those who need it, I would say it's nearly twice as powerful at the same volume.

For the KZ PR2, I feel that using the 4.4mm input is necessary to bring it to life, thus opening up the soundstage and enhancing detail retrieval.

Next, I had to test the HE400SE using the 3.5mm output as I don't have balanced cables. The volume it reaches seemed acceptable to me, but the performance and microdynamics fell short compared to the small desktop DAC/AMP, the FiiO E10K (not to mention the iFi ZEN Air CAN). This isn't inherently the BHD Pro's fault, but it shows that demanding planar headphones won't perform optimally with this dongle when connected in an unbalanced manner.

Battery Consumption
  • Test conducted with the dongle at maximum volume and three volume steps on my phone (Samsung Galaxy A50).
  • IEM used: KZ PR2.
  • The test was performed without multitasking, only music playback with my smartphone locked.

  • 3.5mm Output: Battery consumption in 1 hour = 12%.
  • 4.4mm Output: Battery consumption in 1 hour = 14%.

vs TempoTec Sonata HD PRO

Although belonging to the same brand and housing the same chip inside, it's easy to identify the differences and similarities between these two models:


  • The BHD Pro makes hard-to-amplify IEMs like KZ PR2 shine, thanks to its balanced output.
  • However, the BHD Pro's warm signature makes it more suitable for IEMs lacking punch, while the HD PRO, being quite neutral, faithfully represents any IEM and offers better overall resolution.
  • The construction of both is spectacular, and I appreciate that the new BHD Pro features a much larger number of volume steps, preventing sudden volume jumps.
  • Both are plug & play on Windows.
  • The stock firmware of the BHD Pro had better implementation than that of the HD PRO, avoiding strange music cuts during playback without multitasking.
  • Lastly, the BHD Pro takes slightly longer to heat up than the HD PRO at a similar volume.

Both are excellent portable options from TempoTec. However, I feel that the BHD Pro could have a slightly more aggressive price to attract more consumers.


As I've been emphasizing throughout the review, the warmth added by the BHD Pro is welcome when using gear leaning towards neutral. That's why I noticed that it paired excellently with the 7Hz Salnotes Zero and the LETSHUOER DZ4. On the other hand, with the KZ PR2 and the Whizzer Kylin HE10, the extra warmth only muddied their midrange a bit more.


The TempoTec BHD Pro is a powerful beast in a small and portable form factor. It's impressive in terms of power delivery, but its potential is not always fully harnessed due to how the BHD Pro colors the sound, limiting its versatility.

A great addition for those seeking to add impact to the bass of their colder-sounding headphones and for users who require power on the go.


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Hi. Have you tried any other dongles like Shio with PR2? If yes, which one do you consider to have better synergy? Is there a difference in note weight between any of the dongles for PR2?
K othic
K othic
@Tamizhan Hello there! I have tried other dongles (not the Shio though), and PR2 pairs nicely with more neutral dongles. Someone told me that the firmware update for the BHD Pro changes it sound profile to a more neutral one. In that case, it would pair nicely!
If you pair the PR2 with more warm sounding dongles, maybe you end up with too much bass (at least for my liking).

yea, perfect for a cencibel.


100+ Head-Fier
Tempotec Sonata BHD Pro's Review
Pros: Clean sounding and quite un-colored to my ears
Upgradable firmware to change sound tuning
Plenty of power to drive most efficient IEMs and Headphones
Cons: Lack of high/low gain mode
Bundled type c cable is a little too short (nit picking)
Volume button doesn't sit that firm

Tempotec is known for producing products with a high price performance ratio. I have reviewed several of their products and most of the time i’m left with a positive experience. I got the new dongle from them today which is the Sonata BHD Pro which features dual CS41313 DAC. Packaging is rather minimal yet it doesn't look cheap. It came bundled with a Type C to A adapter, a short Type C to C cable. Build quality is also very solid all around as the dongle’s front features a small see through glass to view the FPGA chip, also the LED indicator, the whole dongle has aluminium case and it looks quite premium. The only thing that I noticed is that the volume toggle doesn’t sit that firm, it does exhibit a slight rattle when you are pressing the volume button.

  • DAC: 2*CS43131
  • SNR: 131dB
  • THD+N: 0.00012%(@32ohm 1kHz 0dB signal )
  • OUTPUT LEVEL: 4VRMS@4.4mm/32Ω,2VRMS@3.5mm/32Ω
  • OUTPUT POWER: 280mW@4.4mm/32ohm
  • Frequency: 0-40KHZ /+- 0.5dB
  • RGB light: indicates working status
  • PCM: up to 32Bit/384kHz DSD256(NATIVE)
  • DSD: up to DSD256
  • MQA: MQA renderer 8X
  • Volume Control: hardware buttons
  • Platform support: Windows PC,MACOS and Android


Gears used for this review
  • Tempotec Sonata BHD Pro
  • Truthear Shio
  • Tempotec IM05
  • 7Hz Legato
  • HifiMan Deva Pro
My review is solely based on what I hear via my equipment and I never consider my reviews to be objective in any way rather a subjective approach. Do take into consideration that everyone’s ear anatomy is not the same, so the psychoacoustics perception might be different as well, but i believe it will not stray too far


Battery Drain
  • BHD Pro is quite power efficient based on my test, i did not specifically measure the power draw but based on my observation
  • BHD Pro is connected to Xperia 5 II at 100% battery, the volume is being set at +- 40% and i connected the Kbear Believe to it via 4.4 and let it loop through the playlist from 10pm until the next morning 9am (UAPP Pro on exclusive mode)
  • That’s about 11 hours and the battery on Xperia 5 II is at 53% when i checked the battery%, that is quite efficient in my opinion based on my observation
  • Upgradeable firmware (i have yet to try that because i’m a Mac user and unfortunately, the flash tool doesn’t support Mac and my windows VM can’t detect the BHD Pro)
  • Independent volume control that doesn’t control the OS’s volume but actually controlling the volume of the DAC
  • Low power consumption
Sound Impression
Tonality wise, BHD Pro doesn’t add much coloration to the signature, i would say it is quite neutral with a slight hint of warmth for the signature. I have tested several dongle with CS41313, including BHD Pro, it does seems like they have this signature where it sounds quite airy and a little bit of meat at the low end.

Listening Impression with the following gears
Tempotec IM05

  • Bass is punchy and tight, mid bass especially
  • Sub bass has slightly better extension
  • Mids are slightly being pushed forward instead of sounding slightly recessed prior to pairing with BHD Pro
  • Slightly bigger soundstage
  • Male vocal has slightly thicker texture and sounds fuller
  • Female vocal is full sounding as well
  • Not so much changes in terms of detail retrieval
  • Overall, a very good synergy pairing the IM05 with BHD Pro, this is also probably it is their own in house IEM
7Hz Legato
  • Legato is a bassy and warm IEM, aimed at delivering analog-ish speaker sound
  • The mids are slightly recessed, but when paired with BHD Pro, the mids doesn’t sound that recessed anymore and it sounded a little bit more forward, both male and female vocal also have better texture and body to it
  • Bass on the other hand sounds a little tame when paired with BHD Pro, the sub bass doesn’t rumble that much, but mid bass is still punchy, a very refreshing experience if you ask me, still very fun sounding
  • Not much changes on the detail retrieval as well
  • Soundstage is slightly better in terms of better height,depth and width perception
  • Legato is not hard to drive, but BHD Pro does have more than enough power to push it hard as Legato scales really well with power and source
Hifiman Deva Pro 4.4
  • Deva Pro is a Planar headphone from Hifiman, that’s not that easy nor hard to drive
  • BHD Pro does have the capability to drive it to optimum performance with a 4VRMS voltage swing on balanced output
  • Deva Pro on its own is quite neutral sounding with a slight hint of brightness in terms of tonality, pairing it with the BHD Pro seems to be a good choice where the overall presentation has a bit more body to it
  • The low end is slightly elevated due to the added warmth, treble is smoother yet it doesn’t compromise in terms of resolution
Comparison (Truthear Shio)
  • Shio sounds warmer to my ears
  • The low end is way more elevated compared to BHD Pro
  • Treble doesn’t sound as airy as BHD Pro
  • It does have a low/high gain mode which can be toggled by pressing a certain button combination (Would prefer if BHD Pro have this feature as well)
  • Although sporting different DAC, they difference are actually very minimal, the 43131 on BHD Pro is a DAC chip with build in amp section, where as on the Shio’s 43198, it is a DAC only setup and the amp section is designed/implemented separately
Final Thoughts
With the implementation of FPGA within the BHD Pro, having different kind of sound tuning by only flashing the firmware makes it quite a versatile unit in my opinion, although I personally wouldn’t want to flash it all the time, but having this feature is certainly handy.
On top of that, the sound is rather uncolored and air, not to mention with a slight hint of warmth, it makes pairing IEMs/Headphones very easy.
The tech within the dongle and the asking price, i’d say its fair and i have no issue recommending this dongle if you’re in search for a dongle that has good performance without breaking the bank.

*A big thanks to Tempotec for sending this over for the purpose of this review. I thank them for their support.

*At the time of writing, there is currently a sale going on for the BHD Pro with discount coupon, which makes it even more attractive and competitive

Head over to their official AliExpress Store and official website if you are interested in getting one:

Tempotec Sonata BHD Pro Official Webstore- Non Affiliated
Tempotec Sonata BHD Pro Official Aliexpress Store - Non Affiliated



Headphoneus Supremus
Well-built powerful dongle with nice gracefully warmer sound, and great promise of more firmware
Pros: -- Competent sound gently on a warmer side
-- Very good power and independent volume control
-- Well-built and attractively looking
-- Excellent power consumption and power management
-- Great promise of 6 different firmware to be released
Cons: -- The volume control switch can rattle when shaked
-- The promise of different firmware is yet to be realized
Build and appearance:
BHD pro offers a very nice solid build of the beatifully machined and finished full aluminum enclosure.

The bottom panel can be unscrewed for more in-depth endeavours including potential modifications (I did not go that far yet...)
The top panel has a nice window with a nice view of the insides, similar to Tanchjim Space.
There are some general similarities in appearance with Space, so a direct comparison can be instructively made.
First, points to Space being lighter and smaller (though the larger BHD pro is not much of a factor for me, still small enough).
Second, the top-panel window is definitely nicer on BHD pro - more elegantly rounded, and smartly covering with its longer extension less sightly USB port and with a good text signature. I also like more prominent illuminarion of BHD pro, shown in the above image, but it can be more subjective - some may prefer more subtle lights of Space.
As well, I really like the option of space gray finish on mine rather than just silver - very attractively looking for my preferences.
Lastly, the area where Space clearly takes points is its much nicer sturdy volume rocker switch with very considerately different height levels for + and - for an easy tactile recognition - very nice!
BHD pro has a simple rocker that can actually rattle.

Minor, but more than "nitpicking", as it can trigger some OCD and better be avoided - really the only deficiency in otherwise excellent build and appearance.

Power consumption:
Truly excellent with ca.61-62 mA consumed while playing, shutting down to 14 mA while idle, unlike many other Cirrus-based competitors. Similar to E44 and BHD original, with slightly higher idke for BHD pro (14 vs. 5 mA) because of bright illumination.
Space has 78/78 mA (playing/idle) - no shutdown in idle. That was the main point for me preventing Space being noticeably superior to BHD pro.
Some dongles can use up to 200 mA (Muse M3), 150 mA (AP90), so BHD pro values are great, especially for the power it can provide.

IEMs used for testing:
Two demanding (<16 Ohm impedance at 1 kHz) all-BAs were largely used: HiSenior U4, and Audiosense T800. The latter is notorious to be very sourse sensitive with its 9 Ohm. For instance, with AP90, T800 sadly was no show becoming lackluster. At the same time, all Cirrus-based dongles that I tested, were good, providing at least 85% of "juice" compared to an externally-powered E1DA SG3 (a good standard for a very capable dongle for me)

Sound rendering:
A brief summary here, with more in comparisons below.
BHD Pro builds upon Tempotec Cirrus-lineage with the neutrality, air and spatiality, while paying some tribute to a warmer original BHD heritage. Then the warmth of BHD pro is implemented carefully and gracefully, working for ca. 85% of my recordings nicely, while being acceptable for the rest.

BHD Pro is not uncoloured, like Sonata HD pro that is one of my most neutral DACs.
When compared to BHD original, BHD pro is not smoothing transients but rather adds a bit of bass carefully, more of the midbass. While I really liked original BHD with many of my sharper all-BA IEMs, it was harder to universally recommend. BHD pro definitely offers more universal sound rendering that should be also more universally liked and even preferred by many. The airy treble is there to balance the added warmth.
E44 is colder by comparison, while BHD pro and E44 are closer together (compared to E44 and BHD original) and are quite complementary to each other.
Tanchjim Space is more airy and spacious. At this point and time, I prefer Space rendering for shorter sessions. In longer listening with my all-BAs and Space can be a bit overwhelming, there BHD pro will fit nicely.
iBasso DC03 pro, while nicely euphonic, is disqualified from comparisons for not being compatible with my older Samsung S10 (I could make it work with some usb splitters, but no more iBasso for me, should not have even tried 03 pro after truly bad (in many aspects of implementation rather than sound) DC04).

I will be happy to provide more comparisons and to answer more specific questions.

Disclaimer: purchased with my own funds at the June introductory discount available to all previous Tempotec customers (no any review talk/obligations; the reason to write a bigger review is solely for my appreciation of Tempotec).

Overall conclusion:
Great solid construction, very attractive appearance, nice sound, excellent power management and the promise of 6 different firmware to be released for different sound rendering - solid 4.5+ stars for me.
With the firware released, BHD Pro can (and, hopefully, will) become a great 5-star story.

P. S. Size comparison of BHD pro, Space, and JCAlly AP20
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its a pity that u dont review. you r much better than reviewers. i enjoyed and benefited from ur review + answers/explanaions on your comments.
glad to meet u.
read everything u have written 3 times. never encountered such a satisfactory + acurrate description with such afew words : -)
@PhonoPhi How would you compare the Sonata BHD Pro to firmware updated SHIO? Mine sounds pretty neutral so no idea if Tempotec is warmer or brighter?