Fosi AudioBT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf SpeakersClimatePartner certified

Last year I had bought a Tangent Ampster BT II amplifier, which had worked great, however it recently had an issue with the power switch, so had to be sent away for repair.As I used it in my office I needed a replacement and decided to order this amplifier.I thought the Tangent Ampster was small, but this BT20A amplifier is ridiculously small!This is mainly as the power supply is external to the amplifier, which itself is bigger than the amplifier.I have it connected to a pair of Mission LX-1 MKII speakers, and I am happy to say that this amplifier easily runs these speakers, with no sign of distortion.I appreciate the treble and bass controls, as by default the treble did sound lacking and a bit stifled.The dials are nice and smooth, and the power switch toggle works without issue.At this size and price you only get 1 set of RCA inputs and 1 set of speaker outputs, but for my use case this is fine.Bluetooth works seamlessly, and the audio quality is about on par with direct RCA connection.Be aware that if you connect via bluetooth it will override the RCA input, even with no music played over bluetooth.I will say, as others have, that being able to connect to the amplifier via bluetooth without being asked for a code is a potential issue, I live in a block of apartments, so anyone could connect to it if they tried.I don't hear any hissing when not playing music, so that is another plus.Overall a great little amplifier for the price, once my other amp is back from repair I will probably relegate that to the living room as it has a remote control that is more useful.

I had a Cambridge Audio amplifier, which has finally given up the ghost - annoying crackle and cut-out on one side of the stereo. It was driving me mad. I listen to classical music a lot. Looking around for a replacement stand-alone amp was proving costly - I have a brand new CA CD player and good CA bookshelf speakers which I didn't want to junk (which I'd have had to if I'd bought a self contained hi-fi system, which at first seemed the only option) Looking around on the net I found this amazing little piece of kit and thought, well, this is so cheap that even if it's not up to much it's better than half the music being cut off periodically by my dying CA amp, and I went for it. It's astonishing. It has plenty of power, and its treble and bass controls are very useful - my old amp didn't have those - as I listen to old recordings too which sometimes need a bit of bass boost or treble cut-back. I have a mass of music on MP3 files on a computer in an adjacent room which I can now listen via the excellent reliable Bluetooth connection. The CD player connected to the little amp works fabulously too. The sound quality has plenty of presence and is not remotely tinny or restricted, which I'd feared with such a little machine. This is a brilliant idea and a mini-revolution in amp design. The folks at Fosi have found a serious hole in the market and plugged it with a great range of innovative and smart kit. Very highly recommended!

I used this unit to drive pair of floor-standing speakers which I use with my PC (I like decent sound quality).This unit delivers punchy bass with no background noise on either the aux input or via Bluetooth. I'd had background noise problems with the previous amplifier (a Tangent 50W per channel unit), probably due to a ground loop. The Fosi BT20A unit background noise is completely inaudible. The unit is also very small (about 1/10 the size of the amp it replaced) but with the same output power. This is probably due to the fact that it is a Class D amplifier which makes it very efficient. It is more than capable of filling the room with sound at concert hall levels.The only issue I've had is that occasionally the Bluetooth input will not reconnect after the PC has been asleep. This is easily solved by briefly cycling the BT20A power.In short, I'd happily buy another.

I bought this on a whim and it has turned out to be an excellent purchase. I bought it with 15% off so it was just over £70.00 and at that price I feel it to be very good value indeed. It is certainly a small amplifier and ideal for anyone with limited space. It has metal casing and feels very solidly built. This gives me confidence as so many items seem flimsy these days. I use it mainly with a CD player and the sound quality is superb and certainly loud enough. Using it for streaming over Bluetooth is also excellent. The only downside is that I find the volume etc controls a bit small and fiddly to adjust. Not a major problem really but a remote would have been nice even if increasing the price slightly. I was so impressed with it that I also purchased a BL20A a few weeks ago. That too is an excellent amplifier and I have reviewed it separately. Overall I cannot fault Fosi products and would not hesitate to buy from them again.