Fosi AudioV3 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 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.

I love this compact mono amp, I mainly use it to power my subwoofer. Fairly simple to use (gain toggle switch between 31dB and 25dB) but fantastic sound and build quality.The only down side is the amount of heat it produces. I don’t suggest tucking it somewhere with poor air circulation. I decided to mount it on top of a cooling fan and this helps a lot with heat dispersion.

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?

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.

Pros: Sound ok stock. But put some Sparkos SS2602 op amps in it and it sounds very good!So the fact that you can "tune" it with op amps is a huge plus for me.Customer support is ridiculously good!! I had a faulty unit and a few emails and pics etc later they are sending me a new board. Nice bunch of guys also. Very honest about everything! (RARE!)Cons: Power supplies are as large as amp. Speaker outputs are too small for 12 gauge wire, so you haveto use banana plugs. (But at least there is that option!)All in all a great (however expensive) upgrade to my 7 speaker porch "Listening room"!!

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.

I didn't need another amp, but couldn't resist on Prime Day. Watched and read all the hype, including cheaphifiman's youtube review among others. I'm really just an old guy amazed by the new technology. Hooked these up in minutes, noted that one switch on the back provided a little more volume. Been listening for hours now, I have not A/B'ed with my Dayton Audio hybrid, but these sound great. Bear in mind I am running JBL L250s and Magnepan LRS+s (not at the same time), the Maggies really suck up the power, but these drive them. I do notice they get pretty warm.It's only been a few days, but I like these a lot. I cannot imagine a better bargain, I mean, you can spend thousands on a power amp, but, the law of diminishing returns applies the more you spend. I'm floored by these.

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