Fosi Audio BT20A 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 Speakers

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 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.

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 brought the first amp a while ago and sent it back as I wasn’t happy with the sound quality or output. I think I said it may be ok for a small broom cupboard.Roll on 2 years or so and having re-read the reviews I decided I would give it another goWith a fresh set of earsMaybe I had a bad one last time of they have tweaked the firmware or something, But it’s a very different amp from the one I recall - To my surprise this one was excellent- I would say unbeatable for the price.Ok so some complain that the Bluetooth is not protected so anyone can jump on it and that would be a nice extra but it is what it is.It’s driving a couple of external speakers with a well known home assistant input for the garden and I’m seriously impressed. Also tried some mission bookshelf speakers I had spare. Bass and treble are adjustable and work remarkably well. Bluetooth seems solid and clear; aux in is even better.Recommendation: set bass and treble to 50% (pointing straight up) as a starting point, this will give you a good reference point.I’m really fussy about sound and wasn’t expecting much but I’m really glad I gave this little beast a second go.I would absolutely recommend for small or mid size room.

This is the perfect answer for powering hifi speakers with a physically small amplifier. I have had this for two years now, and it is faultless. In use with some old Bose speakers it produces a warm tone in a modern room with nothing to absorb the sounds (so it could be a bit harsh). I tried a much more expensive amp, with a graphic equaliser, and the little Fosi is far better to listen to. Treble and base contols give any amount of tone adjustment. Sometimes I listen to things from my phone and the bluetooth is 100% reliable; it has never once gone off or distorted the sound. The amp switches itself from wired input to bluetooth as soon as you connect your bluetooth device, (there is no selector switch or anything like that). For the pc sound I am wired in. You have phono plugs for your input and banana plugs for the output, but for the output you could just have bare wire without plugs. You can see everything behind my computer screen, with a Bose speaker next to it. The speaker is 6½ cm wide, for scale. I can definitely recommend this amp.