I use these with all of my Fosi gear, it actually works. The noise level is noticeably lower when the volume level is cranked to max (with no music playing). I appreciate this inexpensive upgrade for the power supply

I use these with all of my Fosi gear, it actually works. The noise level is noticeably lower when the volume level is cranked to max (with no music playing). I appreciate this inexpensive upgrade for the power supply

Periodically, I used to experience a light buzzing sound with my xduoo xd05 pro when using my linear power supply. I don’t have no clue why it emits but when I physically touch it with my finger, it goes away. Well I don’t have time for that. I bought this and no buzz whatsoever. In fact, it sounds clearer and much better. Not sure if it’s placebo but I don’t think so. Buy it!!!!

Periodically, I used to experience a light buzzing sound with my xduoo xd05 pro when using my linear power supply. I don��t have no clue why it emits but when I physically touch it with my finger, it goes away. Well I don��t have time for that. I bought this and no buzz whatsoever. In fact, it sounds clearer and much better. Not sure if it��s placebo but I don��t think so. Buy it!!!!

I use it with ZA3. I measured what effect this product has. The second photo is without it, the noise is 180mVpp. The first photo is with it, the noise went down to 80mVpp.
In my environment, I was able to reduce noise by more than half. I think this is a very cost-effective product.

I use it with ZA3. I measured what effect this product has. The second photo is without it, the noise is 180mVpp. The first photo is with it, the noise went down to 80mVpp.
In my environment, I was able to reduce noise by more than half. I think this is a very cost-effective product.

It’s not a big investment and so I gave it a try. I’ll keep them. I bought two. For each device because I listen with two monos ZA3. Music coming from ZD3 with op amp Burson v7 vivid.

It��s not a big investment and so I gave it a try. I��ll keep them. I bought two. For each device because I listen with two monos ZA3. Music coming from ZD3 with op amp Burson v7 vivid.

I have only tried one filter so far, on a ZA3. The results are very pleasing, with the ZA3 sounding much smoother, clearer and purer. I am yet to try my second filter, but will get to that with my V3 Monos soon. A good product, and purchase.

The filters brought detail and more depth and warmth, not an ee just my opinion

The filters brought detail and more depth and warmth, not an ee just my opinion

Good quality and an improvement in my chain.

It improved sound. Sound is more natural, high tones are not so bright any more. I use it with my zd3 dac.

It improved sound. Sound is more natural, high tones are not so bright any more. I use it with my zd3 dac.

I have purchased 7 of these EMI/RFI DC filters. They easily reduce noise by half. I use most on SMPS (10A 48V) that feed 300W+ class D amplifiers.

I have purchased 7 of these EMI/RFI DC filters. They easily reduce noise by half. I use most on SMPS (10A 48V) that feed 300W+ class D amplifiers.

I bought one strictly based-on FOSI's reputation and because I own 7 other FOSI hardware.
I am not certain what this "DC Filter" exactly filters out and how much ("insertion loss" (I.L.) measurements):
(1)I.L. data under max/min specified voltages (12V/55V)?and max/50% (10A) loaded configurations across DC-10MHz?
(2)Voltage drop measurements?
(3)Why minimum 'DC IN' is >12Vdc, when you make audio hardware with 5Vdc inputs?

Hey, FOSI,
This owner (of over 7 of your products) thinks that it is a disservice what you are peddling here. This product as advertised is like saying pixie dust makes your audio system sound better. The least you can do, is affix some objective (insertion loss) performance data to the page so that we can actually say "Hey look, this thing will really provide -60dB[?] of insertion loss at 2kHz[?]!"
But I bought one anyways, because of nothing but your reputation, NOT because it's a performer at 10MHz[?]! Do I have to open its case to see build quality and schematic?

So far very content with my new streamer 😃 Have a few more cables to try ... Love the output choices available 😊🎶🎵

So far very content with my new streamer ?? Have a few more cables to try ... Love the output choices available ??????

Very good product.

Very good product.

Excellent product for a reasonable price.

Excellent product for a reasonable price.

Fosi Audio DC Power Filter

Fosi Audio DC Power Filter

This Power Filter gets the job done. And at this price point, it beats the hell out of dropping a small fortune on some massive isolation transformer that takes up half your rack.