Qudelix T71

First Impressions of the Qudelix T71 & T71 IEM Pairing​

This is my first time writing a review, and I couldn’t have picked a better item to start with. While I don’t consider myself a "true" audiophile, I know what sounds good to me. My approach here will be straightforward—focusing solely on the Qudelix T71 and its paired T71 IEM.

Overview​

Verdict: 100% falls into the "DIS GOOD!" category.

Key Specs:

• Core Processor: NXP iMXRT600 ARM + DSP Core
• DACs: Four ES9219C SABRE HiFi® DACs
• Amps: Two Texas Instruments INA1620
• Outputs: Unbalanced (4V RMS, 3.5mm), Balanced (8V RMS, 2.5mm/4.4mm)
• Battery: 4-10 hours (1000mAh)
• Audio Modes: 2.0 Stereo (384kHz/32-bit), 7.1 Surround (96kHz/32-bit)
• EQ: 20-band PEQ/GEQ

Unboxing​

The T71 comes in simple packaging with a thoughtful bundle:




Tips: Spinfit and foam options (didn’t test as I have plenty).

• Accessories: Rubber bands, USB-C to USB-C cable, and USB-C to Lightning cable.
  The cables are sturdy but a tad short for my liking.

The T71 IEM, a collaboration with AME, features:

• 8mm Graphene Dynamic Driver
• Three Sonion BA Drivers
• High-density 3D-printed shell

This IEM was solely tuned for the T71 IEM to output 2.0/5.1/7.1 sound.

Sound and Features​

The standout feature is the T71's ability to unlock 5.1 and 7.1 surround sound. Content from Disney+, Netflix, Apple Music (Spatial Audio), and Tidal becomes immersive, delivering a home-theater-like experience directly to your ears.



Out of the box, the IEMs sound fine, but the magic happens when you use the Qudelix 20-band EQ to tune them. Pair that with surround content, and you’ve got a cinematic experience in your pocket. I can particularly see this being a game-changer for folks on long flights, pairing it with an iPad or other content consumption device.

The included Chrome Extension Web App adds incredible flexibility, allowing for precise EQ adjustments, surround sound, and Hi-Res 2.0 modes. Gamers will also appreciate the NSW mic mode for voice chat, though toggling it on manually through the Chrome Extension is a minor drawback.

Portability and Versatility​

The T71 case is a game-changer for iPhone users, with a magnetic snap design compatible with Qi-charging devices. It’s portable, powerful, and feature-rich—an excellent AIO solution for most use cases (though Bluetooth is notably absent).

Final Thoughts​

While the T71 is an impressive DAC/AMP on its own, the pairing with the T71 IEM completes the experience. The surround sound capability and customizable EQ make it a standout product. For $299 (T71) and $232 (T71 IEM), it’s not cheap, but it’s an investment in versatility and immersion.

TL;DR​

The Qudelix T71 and T71 IEM are a dream pairing for those seeking a portable, customizable, and immersive audio experience. Think "baby Fugaku"—and enjoy every minute of it!

This is just a short impression of my time with the Quidelix 71T iem and AMP dac. It’s a complicated product that I made a longer form video review on it. It’s a great unit overall that has a lot of positives. It has great power a transparent sound and a lot of unique features. This is a short loan that I have got to listen to for a while now. I test a lot of iems and headphones and find this to have a lot great qualities, but a tiny bit of an intimidating learning curve. I did do a Video review, and was asked by the company to do a written impression. So I’m trying my best to summarize the video and many of my feelings on this amp dac without it actually being on me and I did have a lot of notes that I made for my video that made this impression easy.

IEM

The iem is fantastic. The fit is basically perfect for me and I feel it is made of quality materials, it has a nice case, and very nice selection of tips, and is extremely comfortable, which is important for an iem like this.

The stock sound on the iem is slightly lacking. I recommend EQ, but the good thing is that this can only be used with the Quidelix app and 71T so equing is easily done. Sound is by no means bad, just not my cup of tea.


This Eq is here:

Preamp: -9.3 dB
Filter 1: ON PK Fc 20 Hz Gain 1.9 dB Q 0.900
Filter 2: ON PK Fc 100 Hz Gain -5.3 dB Q 1.100
Filter 3: ON PK Fc 680 Hz Gain 0.7 dB Q 1.900
Filter 4: ON PK Fc 1500 Hz Gain 5.2 dB Q 1.500
Filter 5: ON PK Fc 2400 Hz Gain -2.4 dB Q 2.000
Filter 6: ON PK Fc 2700 Hz Gain -1.9 dB Q 2.000
Filter 7: ON PK Fc 3400 Hz Gain 3.5 dB Q 2.000
Filter 8: ON PK Fc 4600 Hz Gain -5.7 dB Q 2.000
Filter 9: ON PK Fc 11000 Hz Gain -5.8 dB Q 2.000
Filter 10: ON PK Fc 13000 Hz Gain 12.0 dB Q 2.000


Amp Specs:

Specs:

• NXP iMXRT600 ARM + DSP Core
• Four ES9219C SABRE HiFi® DAC
• Two Texas Instruments INA1620 AMP
• Unbalanced output max. 4V RMS (3.5mm)
• Balanced output max. 8V RMS (2.5 & 4.4mm)
• 4~10 hours battery time (1000mA Battery)
• 2.0 Channel Stereo Mode 384KHz / 32-bit
• 7.1 Channel Surround Mode 96KHz / 32-bit
• 20-Band Equalizer
• Two High Sensitivity MEMS Microphones
• PC Chrome App Windows/macOS/Linux
• 84 x 40 x 1.6mm / 75g
• Aluminum CNC Body / Plastic Bottom case

No audible noise to the amp at all and you can also adjust left and right independently.
Adjust left and right independently.

CASE
There is a case that you can buy for 10 dollars, it’s pretty nice to use on an iphone or another phone that can utilize the magnetic style case. It’s nice, it’s practical and easy to put on.



VS Quidelix 5k

The Qk5 is Smaller, it has passthrough charging which can be an issue. It is less expensive but ohh so portable and has an awesome clip. It has few faults, but having a 4.4mm out is one of them. So the Q71T 100% fixes that. Bluetooth is such an important thing to have on the go. This becomes a shirt clip. It’s so small and powerful it’s hard not to call the GOAT (Greatest of all time), so to find a device that is better is hard.

For Desktop use I 100% prefer the t71 as it has greater build quality and stays on my desk more easily when moving around. But it’s hard to deny the q5 for many people still retains its title unfortunately.

I would love a larger 6k or some kind of device with a little more build quality with a 4.4 mm out, and a 3.5mm out, and a USB-C out for other iems as I feel usb-C iems are all the rage and not going away. I would even pay a premium for a desktop style device with more connections like 6.5mm, as well and a larger durable amp with more power. Almost like a quidelix desktop dac or amp. Quidelix is a company that I will follow what they do in the future.

Conclusion:

I overall enjoy the Quidelix 71T. As someone with a more totl end game dac and amp I still see value in a dac amp like this. I fully enjoy this device and depending on your portable needs this could be a very good solution that could also be a full time desktop use as well. I don’t find the iem to be a great value, but a nice toy to add to the experience, but I also feel you could add your own iem to Quidelix 5k and not have any problems with eq. So if you need a nice quality iem, it’s an option, but by no mean necessary. This is a midfi king, for users who need the dac amp in their life on a phone that is locked down like the new iphones with usb-c or just want a nice bluetooth dac for their phone or personal computer.
While I could see people wanting a different dongle I do find this dongle to be competitive sonically and desirable in feature set for many iphone users. For this iphone user, I think I just need the basic Q5k for my time on the go, and I can EQ at my desk with Peace APO. But if it’s a useful thing for you to use on the go, or a desktop replacement for you, it’s fantastic and represents great value against something like the 17000 Fugaku or other expensive portable amps that are more expensive with less features.