FosiaudioReviews of fosiaudio.com

NOT the giant slayer many internet audio ‘influencers’ have been billing it as. In this instance I am referring to the P4 pre amplifier. When you get past the excitement-for-hire nonsense this is an unsubtle, mechanical-sounding unit lacking warmth, tonal range and sound staging. It is exactly what it is: a cheap unit and it sounds it. I found it’s presentation cool, hard, glassy and with a steely edge I found unpleasant. This after more than 10 days burn-in partnered with a rich, powerful sounding power amplifier (an Arcam p90). I paid £75. This is nothing in the audio world. What did I expect? This. Precisely this. Astonishing they can do it for so little, but one cannot expect miracles. To put this into perspective the performance with the p90 was below what you expect from a reasonable budget integrated amplifier, so if you are looking for audio nirvana on the cheap, forget it. You’d be much, much better off buying a used Arcam A75+ integrated, for example. Am I damning Fosi Audio? Not at all. But don’t believe those over-excitable types fogging up the windows with their hot breath. If you want to buy cheap, interesting-looking boxes, and play around with their features, this may be for you, but if you are after serious audio - satisfying in the medium-to-long term, then this isn’t it.

I started with a good pair of existing floor speakers and added V3 monoblocks connected to a ZD3 preamp/DAC with XLR cables. Lossless music files come from a server via wifi. The transport device is an old Microsoft win11 tablet connected to the ZD3 by a short length quality USB data cable. On a different system I added a DS2 portable USB headphone DAC and a pair of headphones to a win11 laptop. On both win11 transport devices I aim for bit perfect and use Foobar2000 and ASIO exclusive. To reach this point I have needed to direct a number of questions to Fosi support and have received prompt and useful answers including links to relevant resources. The resulting audio performance on both systems has been very good especially considering the price. All items were delivered in good time by a local Fosi distributor. I feel that to match the audio quality I have now with alternative products I would have to spend big.

I don't know why people complain so much here. And there are so many details missing from those 1-star reviews. If you can, buy from a reseller (eBay/Amazon) as they have better local distribution. Because otherwise you're ordering from China and that might cause issue with your bank and activate import duties. Just use your brain! :) Anyway, the products are fantastic. I have had hi-fi systems for 25 years and these little toys (ZA3/ZD3/ZP3/P4/X5) are just too good for what they cost. I love the D2C approach and how much the engineers from Fosi listen to their customers' feedback. Keep in mind that this is a ~7 year old company, it's as young as it can be! Keep it up guys, love your work 🧡

Comprei um Fosi Sk02 para substituir o E1DA POWERDAC V2.1 e depois de 4 meses o Sk02 deixou de funcionar e a luz ótica não parava de piscar. Entrei em contato com o suporte da Fosi e depois de 5 trocas de e-mail e diversas procedimentos tentando restabelecer o funcionamento normal o suporte da Fosi informou que enviaria outro Sk02 como reposição. O atendimento foi excelente e focado na solução. A minha experiência com os aparelhos da Fosi tem sido excelente, tenho o Fosi K7, o Fosi Sk01 e o Fosi Sk02 e recomendo todos. Fernando Nunes Tinoco.

It all started when the BT30D system I made for my wife's new (tiny) NUCBOX PC coupled with some Gale Reference Monitors and a passive Denon Subwoofer made me cry four times in an hour, while I tuned in the subwoofer. It easily outdid systems I had auditioned in the 90s costing more than $20,000. And this instantly re-ignited my passion for music. For 15 years I have been all about my NAD-based 7.1 surround system on my gaming PC. It is fed by the only audiophile soundcards to ever exist: The ASUS Xonar HDAV 1.3 Deluxe & daughter board - with its 4x LM4562 and 8x JRC2144D op-amps. But for music, this system doesn't make me want to keep listening. I don't know why. Signal path length maybe? So, I with the help of Linda at Fosi, I have built a special 2.1 music system, alongside my 7.1 system - sharing the front ProAc speakers via a switch. And today I am obsessed with music again, and it's all because of Fosi and their incredibly clean Class-D amps: they offer performance I never thought I would ever be able to afford! And so Fosi have made me cry about a dozen times or so in the last two months. Because every time I add a component, the music sounds better and better - and when I first connected my new Hifiman Sundaras to the new GR70 4-valve headphone amp, not only did it make me cry yet again, but it allowed me to hear things in my music, that even $100,000 worth of NAIM gear in the 1990s could not reveal! Fosi make all my old (But VERY good!) speakers and all my old (But VERY good!) music sound brand new again! It's literally like hearing it for the first time! And music genres which used to leave me cold, I now avoid skipping over, and I am listening with intent, and with great pleasure. For me, value is very important, and it's what used to make me angry about audiopphile equipment in the past. Well, I am very pleased to announce that in 2025 the complete democratization of Hifi equipment is complete, and Fosi have had a very large hand in achieving this incredible feat. Now, everyone who wants to own high quality Hifi gear can do so, and at prices which seem to defy sense and reason! On top of this, the friendly and (very!) responsive staff at Fosi are able to answer your questions immediately, and they are extremely thankful when you send them your feedback, and ideas for new products. This is a company founded on the principle of designing what their customers ask for, and this has been noted many times by many people. All I can say to finish, is this: "Thank you deeply, to everyone at Fosi, you have changed my life for the better, and now I am listening to music all over the place: in my car, on new IEMs, and mowing the lawn with my XM4s. Keep up the good work! I'll be buying plenty more Fosi items."

I’ll actually begin with a summary. The bt20a pro is a magical little marvel that 99.9% of users will be happy with. Here’s why: I admit I was a bit skeptical when purchasing. Since the mid 90s I’ve used and heard a great many class a/b amps connected to an even greater array of speakers. I’d call myself an audio enthusiast, though budget audiophile could also apply. This little bt20a pro can hang with just about all of the large “traditional” AVRs/amps I’ve used. Here’s an example. In our main level living room/entertaining space I’ve been running a 2.1 system with an Arcam AVR. Arcam has long been known for prioritizing 2 channel musicality in their AVRs, and it sounded awesome. But my wife was complaining that it was dominating and too large so I replaced it with this Fosi. And here’s the thing. I don’t miss the Arcam. I really don’t. And it cost me over 10 times more. They have different sound signatures to be sure. The Fosi is clean, crisp, clear, punchy, and uncolored. It’s just pure clean power that allows the recording and speakers to be themselves, and it’s great. Plus it’s basically invisible. I linked it to our Alexa and it’s on a switched outlet, so all my wife has to do is flip a switch and it’s go time. And to access whatever I have connected to the rca input, all I have to do is tell Alexa to disconnect and the Fosi automatically connects to it, meaning I don’t have to get up and hold a button for 5 seconds to switch from Bluetooth to my rca connects. My wife gets a clean look with easy connectivity and I get to keep my stereo, and a great sounding one at that. Everyone wins. Finally I have to recognize Summer with customer service. There was an issue with one of the knobs and she provided perfect customer service, like the kind of service my parents always said has disappeared from the world. If you’re on the fence you should give Fosi a try. There’s really no downside. I’m thinking of buying them as Christmas gifts for my son and father in law.

Well, I see a great progress since I continue to buy their products. I’m at the fifth now and the quality has climbed with each one I ordered. With the last product I had a small issue that it could be lived with, but the customer support was kind enough asking just for a video with proof and send me another product that works flawlessly. The shipping was always free and very fast. I would definitely buy again, since they started to add quality dac like AKM and opened the door for the op-amps rolling. I don’t know how they are doing it, but there is certainly a great value product for the price i payed. Since my system value is of many Ks, using a FOSI product instead of a more expensive / fancy one should say enough.

I’ve been using the Fosi Audio V3 Power Amplifier together with the Q6 DAC, and my experience has been fantastic. The V3 amp truly stands out in terms of clarity, power, and versatility. It's compact, robust, and unexpectedly powerful for its size—driving my speakers with tight bass and a very neutral, transparent sound signature. The build quality is excellent, and all controls feel precise. There’s no noticeable hiss even at higher gain settings. Pairing it with the Q6 DAC further elevated the sound quality. The Q6 delivers clean, detailed output with impressive separation between instruments and a very quiet noise floor. Connection was flawless and setup was straightforward—plug and play. I tried it via both USB and optical inputs, and it worked perfectly in both scenarios. Customer service from Fosi Audio has been prompt and helpful. They genuinely care about users and actively respond to questions and suggestions, which leaves a strong positive impression. Overall, these products offer fantastic value for anyone seeking clear, powerful, and honest audio reproduction at a reasonable price. Highly recommended for audio enthusiasts looking for reliable yet affordable gear.