Fosi Audio HT4S Bluetooth Amplifier for Outdoor Speakers, 4 Channel Power Amp for Home Theater, Outdoor Gathering, 4.1/5.0 Ch Stereo Home Audio Receiver, Supports AUX/Optical Input with Remote Control

TLDR: If you're looking for a beautifully built, excellent sounding bluetooth amp this is the one. It excels in audio clarity with little to no distortion at high realistic listening volumes, offers multiple audio input modes that you can select between with a convenient remote, and has the most output channels of any bluetooth amp for this price point. An absolute MUST BUY for any one in the market for a small nice amp.Right out of the gate, this new Fosi Audio bluetooth amp is absolutely amazing. The build quality and design are top notch given the price of this amp. Really hard to beat especially when compared to other similarly priced amps on Amazon.Rated at max power of 50watts per channel at 4ohms, this thing has enough power to realistically handle any speakers you throw at it given its use case. I tested these on my Wharfedale Evo 4.2 bookshelf speakers (these are no slouch!) and WOW what a difference in audio quality over my $1k Denon AVR for music. The DAC on this bluetooth amp is shockingly very clear and defined, definitely ideal for music. Added with the tone controls on the front of the amp, this amp is more versatile than ever. I've got 2 other models of Fosi Audio amps, and this is by-far superior to the other older models that I've got. It's got much better clarity and doesn't distort at higher volumes in comparison to the TB10D that I have.One of my favorite improvements over the previous model bluetooth amps from Fosi is that this new HT4S model has the ability to select your audio input mode. I can now swap between bluetooth on my phone for music and optical/aux in from the TV/Apple TV. On my older bluetooth amp from Fosi it was an on/off switch control and that was it. Both bluetooth and aux were active at the same time. So if I was watching something via the TV somebody else could bluetooth freely and play music over my TV audio which was very frustrating. With this new HT4S model that issue is now gone and the beautiful LED light bar on the front panel displays which audio mode you're currently in by changing colors.

I bought this to power a pair of Klipsch RP-600M II bookshelf speakers on my desk and it does that no problem at all, the volume at 1/4 is louder than i would ever listen to my speakers at and it gives crystal clear sound with zero distortion. I love how it looks with the copper colored volume knob, it matches the copper cones of my speakers great. This amp is also very cool that it can power a passive subwoofer, if the speakers you're powering have a high sensitivity the subwoofer won't play very loud unless you turn the volume up a lot but its nice that its an option. Plenty of connectivity too, it has bluetooth, 3.5mm input and digital input. The amp is bigger than other Fosi amps i've used in the past at about 6" x 6" and 2" tall but thats not a problem for me. The auto power off feature is great too. All in all excellent amp from Fosi Audio.

Bluetooth connects quickly and works fine. This amp will be used in my garage, and I have concern that there is no fan in the unit. We'll see how it does during the summer months. For now, I just have a couple of Klipsch SB2 bookshelf speakers. The sound is decent, base and treble are fine, but the volume is pretty "meh". At high volume there is little distortion, but my ears aren't what they used to be. The setup will be fine but I'll likely update the amp at some point. My speakers have a lot more capability than what this amp can provide. All in all, for the money, not a bad unit.

Really average, low volume, reviews are misleading.

We ordered this for our outdoor sound system. Can’t ask for better quality at this price point! Set up was easy and it is holding up to the SW summer heat. It works exactly as advertised and doesn’t take up too much room!

Bass is too low, even turned all the way up. This is not 5.1 at all, just 2.0 shared across all connected speakers. Worst part of all, and why i chose to return, the controller WILL interfere with a TV nearby and in random ways. The volume up changes the input on my TV. Can you imagine that? Its unusable because of the smallest defect they cannot address other than to say point it away from my TV. Just not possible. The mute button literally turns off my TV.Shame, had promise

The build quality is quite satisfying with a sleek all metal enclosure and considerable heft. The adjustable 2-band EQ works, and can over power satellite speakers fairly easily, though for larger speakers it won’t push that much bass through them, but it advertises it as such, and the sub pre-out is a true pre-out with little-to-no noise. Total volume is surprisingly loud through 5 Klipsch Quintet |||’s. Bluetooth is stable and far reaching (near other side of house through walls far). Recommended, especially for the price point and compactness.

Easy installation amazing connectivity and quality sound.