Fosi Audio K7: THE Perfect Mid Tier Desktop Solution??

May 17, 2025

Pros

Solid build quality
Simple EQ functionality
Clean yet dynamic sound
Powerful output for the price
Low enough noise floor for most IEMs
Supports some Hi-Res bluetooth codecs
Microphone jack!
Adjustable microphone input volume

Cons

Volume knob adjusts 2-3 steps instead of 1 step
No parametric EQ
Doesn't support LDAC
Microphone only works on UAC 1.0 mode

Disclaimer

Thanks to Fosi Audio for providing a unit of the K7 for me to review, but all thoughts and opinions are my own, and are not influenced in any way.

Please take this review with only a grain of salt, as everyone's hearing, fit, and gears may differ, so our experience may be different.

Price(MSRP)

$199.99

Devices Used

Oriolus Isabellae

Letshuoer EJ07M

MA Audio Marquis

Extremely sensitive IEM
Discontinued

Fearless Audio S8 Pro

Sennheiser HD600

Hifiman Sundara

Packaging

Fosi Audio K7

USB Type A/C to Type C cable

BT Antenna

Y-splitter cable

Power Supply

Source: Official Fosi Audio Page

Design & Build Quality

Very sturdy, body is made entirely out of metal, except for buttons and knob which are made out of plastic

Bluetooth

Nothing much to say except everything works as expected.

Pairing is very straightforward and easy.

Latency is definitely good enough for watching content and listening to music, but not quite sure about gaming.

Unfortunately, it lacks the support for LDAC but it still has other hi-res alternatives like aptX HD.

Sound & Drivability

Sound

Sounds mostly clean and neutral to my ears, with adequate note weight, generally smooth treble and have good dynamics

Drivability

Very good power, it drove my HD600 and Sundara with ease, with even some headroom to spare.

Others

From my testing with my MA Audio Marquis, which is a highly sensitive to noise and impedance, I am able to conclude that:

The K7 have nearly 0 ohm impedance, which is also further confirmed by a staff member by Fosi Audio

The K7 is able to drive highly sensitive IEMs with minimal noise floor, which my extremely sensitive Marquis have 0 background noise.

Other Features

EJ07M (0 to +12 bass adjustments, 3 step)

EJ07M (-6 to +6 treble adjustments, 3 step)

EJ07M ( -12 to 0 bass decrease, 6 step)

The EQ feature can be adjusted through the knob but only not in bypass mode, bypass mode means that it will ignore EQ completely.

As seen from the graphs above, it basically shifts the whole tonal balance, which I believe is simple and effective enough for most.

Both bass and treble adjustments are in used simultaneously

Each step is about 1-2db difference, which is enough for fine tuning.

Personally would prefer an in-built parametric EQ feature like most of the modern dongles, but that might not be as user friendly.

Microphone

Microphone can only used in UAC 1.0 mode.

It works fine, did not have any trouble using from lowest gain to highest gain.

Volume Control

1 click on the knob increases/decreases volume by mostly 2-3 steps, sometimes 1 step.

I find this to be random, and it should only be 1 step, otherwise the 62 volume steps are only semi-functional.

I genuinely hope this can be patched in the near future as I find fine tuning volumes to be a pain on the K7.

Conclusion

Overall, my experience with the Fosi Audio K7 is overwhelming positive, as I think it is a solid contender for being one of the absolute best mid tier all in one solution for desktop setups.

Packed with simple yet effective features, versatile enough for open backs and IEMs, has microphone and bluetooth connectivity, and it sounds greats.

However, there are several nitpicks throughout the review like the volume steps and the lack of PEQ, which I believe are not serious enough to be a deal breaker but might be a bit annoying, at least that will be the case for myself. In the end, it will be up to you to decide.

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