Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs 48V/5A Power

I first encountered the Fosi monoblock V3 for use in a music-only system and was blown away by its transparent sound and high power for such a tiny box at such a low price. I began to think about deploying more of them as a possible upgrade for an older (but top of the line) Onkyo Dolby Atmos AVR in a 5.1.2 Atmos layout, using the Onkyo's preamp outputs rather than the internal amps.So far I have installed 3 of them, powering the from L & R and the Center Channel. As I expected. everything sounds better. The sound is more detailed and accurate, imaging is more precise, dialog emerges more clearly from other soundtrack elements. I look forward to soon adding more V3's to complete the surround channels and the height speakers, but the listening experience is already so impressively improved.The way these amps power on and off based on detection of signal has functioned perfectly with no delays, popping sounds or any other negative aspect. They just work. I was always pleased and proud of the high fidelity of my AVR, but this has been an extremely high value upgrade that has put it into a whole other category. HIGHLY recommended!

I wasn't expecting this much from a device like this. I have two 12 infinity subwoofers that are dual voice coiled. My thought was to give these a try in the off chance they can actually push the sub. I tried both 8 and 2 ohm configurations on one subwoofer and I am really impressed. 8 ohm, the subs were happy, I would guess they were getting around 130-140 watts as expected. The damping is impressive with 8 ohms as everything sounded amazing and tight with true accuracy of the sounds it was able to produce. When I tried 2 Ohms, that is when I laughed out loud due to my shock on how much current this thing can produce! I'm not going to say it was crazy but it was truly getting there. I'm not sure if this can double the power at 2 ohms but it did seem to be producing more then 300 Watts RMS with ease. I have a 400 Watt RMS amp and this thing is right up there with it.My plan now is to get 4 of these and pin each amp to a voice coil to provide 480 Watts RMS (240W per voice coil) to each subwoofer. While it performed well at 2 Ohm I feel a 4 Ohm load might be a slight bit better on damping.For the price these things are absolutely amazing, I am now figuring out if I need to run a dedicated 20AMP service for my audio equipment cause these alone will draw 14 Amps when they hit. I'm pretty sure I will trip the circuit breaker on a 15AMP with the rest of my gear if I don't upgrade it.

works great and sounds great

The V3 mono is a steal at this price. So much power in such a little package. I bought two for my desktop setup. I run them balanced from a SMSL Raw MDA1 and into Klipsch RP600m. They sound amazing. I don't think it can get any better at this price. My only complaint is that they get way too hot. Sometimes too hot to touch. I added a heat sink to both of them, which helps.

1 out of 3 was defective , it powers on but no sound.The remaining two work great, they do seem a bit too hot. As long as it doesn’t break in next some years, nor interfere with the sound heat doesn’t bother me.One thing to note there is much louder sound when I use RCA input vs XLR I had to add +9 db on my receiver for same volume.Also there is a some noise when using RCA to RCA, XLR has almost no noise. My receiver unfortunately doesn’t have XLR output, I just use RCA to XLR cable. Works great, no interference noise, only downside is I have to +9db on a receiver.I hear lots of people adding Sparkos OP amps. Is it worth it I wonder?

I bought two of these as an experiment to compare against five other dedicated amps that I own - (Adcom, Outlaw (80 pounds), Emotiva XPA, HK Citation, and Onkyo) -various models and years from 2022 to the 80's with the Citations. Coupled to the Topping D90 and the Topping P90 Pre Sabre and playing through a pair of Sonus Faber floorstanding speakers, my initial thoughts were that they were a bit too transparent and thin. I was confident.that my amps some costing over $1600 were superior and that I would shuffle these tiny monoblocks in a seperate surround system as drivers for Dolby Atmos channels. Well then I read about Sparkos opamps. I ordered four of the SS3602's and the story changed. Hard to believe but these little devils improved the presentation beyond my expectations. The clarity and tightness of bass is still excellent but the vocals seem insanely good- holographic. Incredibly I would even say that they sound better now than any of these other amps using this combo. I have learned that the synergy between preamps, dacs, amps, and speakers makes a big difference. An enjoyable hobby which now just got a lot cheaper!!

My vintage integrated amplifier didn't have enough juice to run a quad stack of vintage Advent speakers. I was preparing to shell out a few grand for a power amp but found these monoblocks are perfect for what I need. Very clean, powerful sound for the money.

Great amp for desktop great value super clean. Not recommended for home theater