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Headphoneus Supremus
Pros: Microphone input, parallel outputs, lots of power, op-amp rolling, PC bay compatible, small form factor, simple interface, quality components, Alps volume potentiometer, 5-year warranty
Cons: High output impedance, really bright blue front light
Video Review:

0:00 - Start
0:17 - Disclaimers
0:28 - LED indicator
0:55 - Front panel overview
1:58 - Back panel overview
2:41 - PC case rail mount system and usage
3:51 - Case cover removal
4:08 - Internal components of the amplifier
4:28 - Max Current Power Supply
4:56 - User-replaceable op-amps
5:53 - Types of op-amps the Fun uses
7:05 - Part 2 of the review
7:22 - Power output
8:06 - Headphones used for testing
8:28 - Amp-headphone pairings
9:06 - Output impedance and its effect on headphones
9:43 - Sound overview disclaimers
9:58 - Instrument separation
10:34 - Soundstage
11:17 - Tonality
11:39 - Bass
12:23 - Lower-midrange/midrange
12:37 - Upper-midrange
13:40 - Treble
13:52 - Fun versus RME ADI-2 DAC
14:16 - Overall sonic impressions
14:55 - Final recommendations
16:22 - Amp options in this price range
17:05 - Stay tuned for Part 2

0:00 - Burson Audio V6 op-amp options 1:33 - Op-amp installation 2:12 - V6 op-amp features 2:55 - V6 op-amp orientation upon installation 3:08 - Stock op-amp versus V6 Vivid sound 3:33 - Bass 3:56 - Treble and upper-midrange 4:38 - Instrument separation 4:55 - Imaging 5:26 - Sparkos SS3601 alternative op-amp 5:53 - Burn-in disclaimer 6:11 - Thank yous

Thank you to Burson B for contacting me about getting this demo unit to listen to! I previously have not been too interested in a Burson Audio product before, but I would say the Fun is definitely worth looking into!

EDIT (2020/01/29): Burson will be sending me the V6 Vivid op-amps to test out! Stay tuned for an updated impressions section!


Notable Features:
  • Dual mono Class A amp/pre-amp
  • "Max Current Power Supply"
  • Elna brand low-tolerance MELF (Metal Electrode Leadless Face) resistors
  • Code:
    R (Ω) P (W) V (V) I (mA) SNR (dB)
    8 1.2 3.10 387.30 91
    16 1.9 5.51 344.60 92
    32 2.1 8.20 256.17 95
    100 1 10 100 94
    150 0.66 9.95 66.33 96
    300 0.33 9.95 33.17 94
  • User-changeable 8-pin operational amplifiers
  • Microphone input
  • Parallel RCA and microphone outputs

The only reason for me to give this unit a 4/5 rating instead of a 5/5 one is because of the high output impedance, and the blue LED power indicator is too bright for my preferences. Everything else about this unit is rock solid though, and I would give it a strong recommendation for someone looking to get an affordable, customizable amplifier/pre-amplifier. Giving the user the option to change the Fun's sound with different op-amps is a really awesome concept.

Simple, compact, and flexible. That pretty much describes the design of the Fun.

The exterior is flexible in that it can be used as a desktop amplifier, a pre-amplifier, as well as being able to be installed into a PC bay (being powered by your PC's power supply via Molex connectors instead of the DC input). No other audio enthusiast-designed amplifier that I am aware has this kind of flexibility, and that makes the Fun really unique. Unfortunately my PC does not have external drive bays, so I was unable to test out its use case for that scenario.

Still on the topic of the Fun's exterior design, the large Alps volume knob is a nice inclusion: it has a very small channel imbalance region, and it feels very smooth to operate.

Two things about the exterior design that I am not fond of are the super bright blue LED indicator that basically shot a blue laser beam across my room at night, and the rough matte-black finish that makes cleaning it a bit difficult.



On to the interior of the Fun, it too is well-designed: using quality components, custom-made parts, and a dual-mono amplification stage. These all aid in the overall sound of the Fun.

What is also unique about the Fun's design is the addition of a microphone input, and output section. Although this is targeted to a small set of users, such as gamers, it can be useful for those who are looking for an amplifier with this feature.

The only issue I have with the Fun's design is the 6-ohm output impedance. This is quite high for low-impedance headphones and in-ear earphones, and the damping ratio does play a role in this case (see sound impressions below). However, the higher output impedance helps to protect short-circuiting when the headphones are unplugged while a signal is being played, so there are some safety precautions set in place given the Fun's high output power.

Amplfiers are still somewhat of a mystery to me, to be perfectly honest. I mostly find sound differences between setups coming from the headphones, the DAC, the power supply, and not so much the amplifier (save for tube amps). I use the RME ADI-2 DAC as my primary DAC and amplifier, but in this case, I did hear a difference between the ADI-2 DAC and the Fun. The differences are more pronounced with my AKG K701 versus with the Focal Clear.

All of these impressions are with the default op-amps installed in the Fun. A hex wrench, and other op-amps were not included in this demo package.

Whether it is the actual amplifier design, or the discrete power supply built into the Fun, I find the Fun to have a very black background. Imaging is superb as a result of this, and is the easiest thing to distinguish between the Fun and the ADI-2 DAC. Instruments are well-separated from one another and this adds a sense of layering that I have not heard before with the K701.

Related to imaging, the sense of soundstage is presented in a more three-dimensional manner, making the K701 even more enjoyable to listen to. Usually, the K701 has a two-dimensional/flat-sounding presentation of with sounds mostly panning left and right, but on the Fun, instruments were presented in front of me as well; a nice change of pace to hear.

Again, I am not sure if these two aspects of the sound are attributed to the amplifier section of the Fun, or the well-designed power supply. Both of these qualities are what I hear when a better power supply is implemented into an audio chain, as well as going from single-ended outputs to balanced outputs (perhaps the dual-mono design aids in this as well).

As for the overall frequency response, the stock op-amps seems to make the Fun have a slightly emphasized mid-bass, upper-midrange, and a kind of grainy treble. These attributes give the Fun a slight coloration of sound, which may or may not be good depending on the headphones you use. For the Focal Clear, the emphasized upper-midrange is a bit much for me (becoming more fatiguing to listen to), but it is okay with the K701. The slightly emphasized mid-bass is great for both headphones on the other hand, and it makes the music listening experience more fun. I still find the stock op-amps' sound to be a bit rough, but I assume this will change once op-amp rolling is taken into consideration. Volume-matching the outputs of the Fun and ADI-2 DAC, the emphasized upper-midrange is apparent to me in comparison to the more neutral-sounding ADI-2 DAC.

Despite this, the Fun drive both the K701 and the Clear with ease thanks to its high output power capabilities. Additionally, the Fun's headphone output is clear of any background noise: I am able to use the Ultimate Ears Reference Remastered perfectly fine without any volume potentiometer channel imbalance issues, nor background hiss.

On that note however, the high output impedance of the Fun does affect headphones with a low impedance (minus planar magnetic headphones), as well as in-ear earphones with multiple drivers. For this purpose, I do not recommend the Fun if you plan to use it with such headphones. Listening to the UE RR on the Fun, it is evident that the bass is less controlled than when using an amplifier with a lower output impedance: the bass and lower-midrange frequencies almost sound slurred and less textured.


V6 Vivid Op-Amp Update (2020-07-14):

Burson kindly sent me a pair of the V6 Vivid op-amps for me to try out...actually I accidentally requested the Dual op-amp version at first instead of the Single op-amp version, so it took a little longer to get my impressions sorted out.


^ The Dual V6 Vivid looks almost identical to this, except it says Dual on it, and the print is on a different side of the op-amp

After letting the V6 Vivid burn-in with pink noise for some 250 hours, I did a lot of back and forth listening between it and the stock NJM 5534D op-amp. To be honest, I wasn't expecting much of a sound difference since I was under the impression that op-amps are just one component of the whole circuit and that the rest of the circuit was probably optimized. I was wrong about that, haha.

As it turns out, the V6 Vivid vastly improved the sound quality to my ears; many of the issues I had with the stock configuration of the Fun were resolved.

For the bass, the lows sounded like they had more extension as opposed to having a slight emphasis on the mid-bass. This was one of the biggest differences I heard between the RME ADI-2 DAC and the stock Fun and it made listening to electronic music more enjoyable.

The somewhat shouty and harsh upper-midrange I was hearing from the stock Fun was also alleviated with the installation of the V6 Vivid op-amps: music was overall less fatiguing to listen to, especially when using the Focal Clear.

Although I thought the treble was grainy-sounding with the stock op-amps, the Fun still retained a good sense of texture. With the V6 Vivid op-amps installed, the treble seemed smoothed out, which I find to work out fantastically for general music listening, but the overall sense of detail seemed less.

Instrument Separation
Another difference I heard between the V6 Vivid and stock op-amps was the ability to separate instruments within the headspace. As mentioned above, the stock op-amps have a very incredible sense of instrument separation, to the point where I can easily pick out instruments from one another in a mix.

Listening to the V6 Vivid op-amps, that sense of instrument separation was still better than the RME ADI-2 DAC by itself, but it wasn't to the same degree as the stock op-amps.

That being said, I did like how the V6 Vivid op-amps presented the sounds more in front compared to the stock op-amps. This kind of imaging reminds me of how one would hear bookshelf speakers on a desk setup, so this kind of presentation is what I prefer to hear when listening to music, and I find it to be more engaging.

Given the fact that the Fun can be used in many different scenarios, I think this is a terrific amplifier for what you pay for, even with the stock op-amps. The fact that you even swap out op-amps makes this amp fun in of itself. I might purchase a Fun just to try out different op-amps!
Last edited:
I don't have that kind of equipment on hand unfortunately, so I can only do what I measured above. A 3-ohm output impedance is still within spec of the Fun (rated at 6 ohms), so I wouldn't rule it out, and its effect is audible to me.
I updated the review to include my impressions of the Fun with the V6 Vivid op-amps installed. Good stuff!


100+ Head-Fier
Pros: Outstanding musicality, rich harmonics, flat response from 20Hz-20kHz
Cons: None
Fun_Marketing.png 03_P1410494.jpg Fun_Back.png

Outstanding Headphone Amp

A Review On: Burson Fun
Review by Mike Brunner (Lead Guitarist for Rivul)
Review Topics:
About Me
About the product/expectations
Provided for review by manufacturer
Normal Retail Price: $299
Pros: Outstanding musicality, rich harmonics, flat response from 20Hz-20kHz
Cons: None!

About Me
To get started, let me tell you a little about myself.
I’m a gigging musician (lead guitar/backup vocals), an audio forensic analyst, a novice sound engineer, and an avid music lover with a wide taste in music. Being an audio forensic analyst is a plus I find when reviewing audio products simple because I know what bad audio sounds like and usually know how to correct it. My experience allows me to be familiar with the limitations of my own ears and the equipment I’m using.
For the consumers, my perspective for all my IEM reviews will be based on these things. I won’t sugar coat things or make things sound better than they are. I’m just like you and I want good value for the money I pay for any product.

To the manufacturers, I’ll always give you an option to respond to any concerns such as quality that I have during my review. I’ll contact you directly and will do so before my review is published. I want to provide an honest and tangible review for your prospective customers without being unfair to you as a manufacturer.
I’ll always be fair and my review will be based on my perspective and my experience.
Now on to the important stuff.

About the product/expectations
I was provided a review sample for my unbiased review. Having tried the Burson Play, and really enjoying it, I was expecting the Burson Fun to be on par.

The Burson Fun design is very professional looking. The metal enclosure and sturdy input/output jacks feel like they will last for years. I have no complaints about the build quality at all. The only thing that I would say is that for my setup, I would like to have seen perhaps a digital input. Having reviewed the Burson Play though which is the same price, I really felt that the Burson Fun missed the mark slightly. I didn't quite understand why Burson would offer the amp only section of the Burson Play, without the USB DAC.

I suppose each product has it's fit, especially if you already have a top notch desktop DAC and are just looking for a top notch desktop headphone amp.

The good stuff! This is what all of us audio geeks/audiophiles want to hear about. So when I first started this I decided to give myself a baseline using my pro audio gear. I first listened to my desktop DAW interface (Sapphire 2i4) and Midas M32. Both are designed to give pristine audio with no coloration at all. My monitors of choice this time were my 64Audio A18t, Fiio FH5, InEarz Euphoria. The 64Audio pairing is for technical listening with musicality, the Fiio FH5 for everyday use, whereas the InEarz is for ease of listening.

After setting up the baseline through listening to each interface for about an hour the break down was the Burson Fun is a very clean Amp. There was little to no noticeable difference to my ears. After listening to the Burson Fun the transition back to my pro audio sources were nearly transparent. There was a just a slight musical warmth from the Burson Fun that I detected and I found myself missing after a short play back on my normal desktop gear.

Across the entire audio spectrum the Burson Fen seemed very flat. I actually hooked both the headphone out and the RCA outputs to my DAW to analyze the frequency response. In the lowest frequencies, the Burson Play showed a slight dip below 20Hz, and a slight dip above 20KHz. This simply put, in the audio range, the Burson Play showed a perfectly flat frequency response. Whatever you put in you get out. Near perfection for $299? Wow! Long term usage of the Burson Fun, left me wanting to return to this setup for that just slight warmth/musicality for my listening.

Each of us wants value for our money. The value of the Burson products that I've tried are well above their price point and the Burson Fun is no exception. This is an outstanding value for a professional quality desktop headphone amp. Great job Burson!


Headphoneus Supremus
Pros: Great sounding op amp at a reasonable cost that enhances the listening experience.
Cons: None, that I can see, it does consume a bit more power, and distorts at extremely loud listening volumes.
Burson Audio Supreme Sound Opamp V5i

Before writing this review I would like to thank Carlos of Burson Audio for sending me the Burson 5vi to test and review. He has has kindly offered me a free trial of the Burson V5i op-amp in return for my honest feedback.

The V5i can be used to substitute for many op-amps of different models. A nice
bonus provided by Burson Audio, an Australian company, is the lifetime warranty for the V5i.

About Me:

I am a musician and artist who became interested in the High Fi audio scene about 10 years ago. I own and play several instruments and am interested in mixing. I tend to favor heavy metal, death metal, and hard rock, but I also listen to Jazz, Bluegrass, Trance, BlueGrass, and Folk music.

I own a few TOTL CIEMS one of them being the JH Roxanne. I own a few TOTL DAPs like the Astell & Kern AK380 Copper +Copper amp and Lotoo Paw Gold Diana Edition as well as more budget friendly items such as the
Zishan Z1, Walnut Stack, KZ ZS7, and CCA C16.

I have done some op-amp rolling in the past with cmoy type amps, and
believe op-amps make a change in sound. My main experience
is with the Lehman black cube, Objective 2 amp, Little Dot I-IV,
and the Matrix M Stage Amps.

Testing equipment:

DAP: Zishan Z1, Walnut V2S/Walnut F1 (Walnut Stack
IEMs: KZ ZS7, CCA C16, JH Roxanne CIEM
OP-amps: Burr-Brown OPA227, Signetics NE5532, (Zishan Z1 stock),NE5532 (Walnut
V2S stock)


The op-amps come in a fully protected, sealed and professional looking box. The op-amps are extremely well
built like little tanks.




Fortunately, the Zishan Z1 and Walnut 2VS installation is straight forward, plug and play, as I'd have to dig up my old Weller soldering gun, and my desoldering iron.



Burn In:

I am a firm believer in burn in, I burned both op amps in for 100 hours each.
I noticed the first big change after approximately 50 hours of burn in with a
further refinement after 100 hours.

Sound Impressions:

Of course, any review of this kind is subjective as a reviewer's taste in
music varies. Thus, it is very subjective.


One thing I dislike about the Z1 is that the highs lack detail, there is a
grain to the sound. There is a lack of clarity and extension. With the Burson
the grain is gone. The highs gain clarity, sparkle, and increased extension.
There is much more micro detail. They gain air and refinement.


Both male and female voices sound more natural and realistic. There is an
increase in detail. The midrange details sound less congested, has a more
natural timbre, and a warmer tonality.


The bass has more impact, the bass is much more detailed and has more texture. It is more defined and tighter with much greater detail.


The stage gains width and depth, and there is an increase in clarity, layering,
and dynamics. The sound is more musical, but with greater detail and a better sense of space.


Clarity, transparency, speed, and instrument separation
are the main sonic characters of the Op-Amp. There is no coloration of sound.


The op amp provided a couple hours less battery life due to increased
power consumption. The op amp distorts are very loud volumes more quickly
than the stock op amps.


The Burson 5vi is a worthy upgrade to budget and mid level DAPs, the increase
in bass performance and clarity is worth the price of admission alone. I was
also pleasantly surprised by the increase in the high end, and just the overall
dynamics and separation of the sound. The 5vi excels in all sound areas over
stock and is a very nice upgrade.


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