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

I am quite picky and want a clean, high-quality sound with plenty of volume when it comes to hifi. This is a very compact little amp (40mm high, 120mm wide and 160mm deep). It has a good quality feel and a reasonable weight to it. I am using it to drive 2 Q Acoustic Speakers (2020i) that are rated 75 watts at 6 Ohms. I have the amp connected via banana plugs. I would say the amp matches these really well and drives the speakers fully. Not too much and not too little. At max volume there is a touch of distortion but not that much and honestly whilst I do like loud music, I would not really want my music that loud in the kitchen, I have another set up for that elsewhere. The treble and base adjustment may in some ways seem old fashioned but I really like them as you can give it a little more base or treble depending on your speakers, the music and of course your personal preference. You can get graphic equalisers to add to your phone, etc, but the on-amp adjustment just seems more accessible. I am not using the bass driver and honestly I do not think I will. So why did I buy this amp when Fosi do a version with no bass driver? Well, Amazon had a discount that made this version only £5 more than the non-bass driver version. Another reason though was that this comes with a 32 volt power supply and the non-bass driver version ships with the 24 volt supply but can be upgraded to the 48 volt supply. This means you will not get full performance if you only buy the one that ships with 24 volt supply. You can upgrade on the Fosi website but not on the Amazon website. You can buy the 48volt power supply separately on Amazon but this pushes the price up quite a bit. So, therefore I preferred this slightly higher spec model that ships with the 32 volt supply from Amazon and this is the max supply allowed for this unit, I think. That was my logic and it would be interesting to know what Fosi themselves think about this and whether my deductions were correct. I think Fosi should add the 48 volt power supply option to the non-bass driver unit on Amazon. I use this in my kitchen and for me a key selling point is the size. I have built it in to the bottom of one of my kitchen cupboards and of course its small size means it is very discrete. The Bluetooth works fine. Still good volume. It connects easily and makes a little bleep to signal connection. You can also connect directly if you have the right cables. The sound quality and volume are marginally higher and cleaner when connected directly, but the Bluetooth still sounds good. My arrangement slightly compromises the view to the Bluetooth antenna, which I have rotated so it is exposed somewhat. This does not seem to make much difference and the range is still fine. I am using it with iPads, iPhones and Samsung phones. All work fine. So I am very happy with this Fosi unit but I would recommend you look at their full range, perhaps on their website before you decide the best one for you. I went for Amazon because I knew it would come quickly and be an easy return if I did not like it. I am a bit shocked and pleasantly surprised that such a tiny and affordable little unit can be so good. Well done Fosi. (Ultimately I decided to get the non-bass model with the 48 volt power supply. This does give slightly greater volume with less distortion which is why I have updated this review.)

Arrived in a fair sized box - then you open it and go 'No way'. It's tiny, maybe as big as 2 Nurofen packets on top of each other. Is this gonna make any sound at all? (I'm used to 19 inch Cambridge amps etc). Well flippin eck, it does. I was gonna use it to power the sound on my tv, a Hisense, into Gale bookshelf speakers, which can sound amazing. All you do is attach the speaker cable, then the tv and the Fosi amp found each other straight away via Bluetooth...and boom. Big sound, happily supplying the speakers with all they needed. And it sounds great! I just set the unit's volume to 12 o'clock and control the level via the tv remote, never touch it. For £60 this thing is startlingly good, and let's be honest cheap as chips.

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.

This amplifier is supplied with a 160 watt power supply so don't expect the full capability of power output from the chip. However, it produces more power than I'll ever need, I'm assuming approx 80 watt per channel. I'm impressed with the sound and the ability to play around with the preamp chips. The Bluetooth works with surprisingly good sound to my ear.

This a small amplifier for sure but packs a surprising punch, working from I lost a lot of space on my desk due to an additional monitor and could no longer utilise my old Denon amp which I have moved to another room. I decided on this amp after purchasing powered edifier bluetooth speakers and not being happy with the soundscape they created, it was very unrealistic and the bass behaved oddly. This amp surprised me, at 32v 5amps it powers my old Wharfedale diamond speakers at 50w per channel. The tone controls are responsive and overall I like the soundscape it creates, its a small room. There is no audible background hiss when powered regardless of source on/off. I've noticed you don't gel full output when using bluetooth mode but not a major concern for me as I usually input via RCA. I'm pretty impressed at the TPA3255 chip, it seems to be solid in terms of performance. Also like the fact that you can replace the op-amp chips if you want a more sophisticated soundscape. In terms of appearance its simple & clean, the orange volume knob does add a little to aesthetics. I've run the amp for several hours at a time without noting any difference in temperature of the unit.

Great quality amp for the price. Nice and small to keep a clean setup. Easy plug and play setup and Bluetooth connectivity. Works perfect with my speakers giving good volume.

Having had a few different hifi setups in my time, I am pleasantly surprised by this latest purchase. I'll list some pros and cons and then give a bit more information about this Fosi Audio amplifier. Pros: - Size: I have a Denon amplifier and Mission bookshelf speakers. The Denon amplifier is amazing, but it's large and I haven't had enough space to put the amp and speakers together on a surface. It's probably the main reason I bought this product. It means I can still use my lovely mission speakers, and the speakers and Fosi amp all fit on a surface I have free. - Sound: If you are getting this, having never had a proper amp+speakers hifi setup, it's probably going to blow you away. The sound quality is very impressive for such a small unit. Having the treble and bass controls are a nice touch. Pair this little amp with some decent speakers and you'll be happy. For the price and considering the size, it's wonderful. - Bluetooth: Nowadays, for the sake of convenience, I use Bluetooth for my music often. Music does sound very good simply streamed from my phone through Bluetooth to the Fosi unit. There is an RCA out for any peripherals (such as a turntable or cd player etc). I haven't had any issues using the Bluetooth. -Build: The unit is made of metal. I've read some reviews mentioning the switches felt cheap or loose....maybe I'm lucky, but mine is fine. Great build quality and sturdy controls and ports. Cons: I can't really think of any. My Denon amp is a fair bit better than this unit in terms of sound and power output, but buying a new amp similar to my Denon unit would cost in excess of £300. And there isn't exactly a huge difference between them. This amplifier got my wonderful Mission speakers back into action and since I've had the amplifier, it's made listening to music really exciting again. I'd say it's good enough for bedrooms or small living rooms. If the room you have it in is particularly big, you may need something a little more powerful. Having a remote control would have been a nice addition. Ultimately, im really impressed with this. It's a quality audio product for not much money. Pair it with some quality speakers and you won't be disappointed.

Bought this to pair with a cheap turntable to play through the speakers of an old home entertainment centre that died a few years ago. The speakers were 2 ohm which limited my choices a bit, but I thought I'd take a punt on this little amp. So far, it's been great. Connecting it up was easy, standard phono plugs to the turntable and banana plugs to the speakers. The banana plugs weren't actually necessary as the port caps are screwable, so you can just attach the speaker cables and screw them down - but as I knew I was going to moving the whole system around until I was happy with it, I fitted the banana plugs to make it less of a hassle. The amp also has Bluetooth in, so you can play music from your phone too. I've got this set up as a 2.1 system, with a passive subwoofer and the amp drives that fine. The ONLY way this could be improved for me would be for them to add a balance control to even out my (by necessity) dodgy speaker placement. It all sounds great and for the price, I don't think you can go far wrong with this, so would recommend.

高品質なサウンドが楽しめて喜んでいます。テレビとは有線で、スマホとはBluetoothで接続。Bluetoothで繋ぐとテレビの音は消音されるので、外部入力よりBluetoothを優先します。 シンプルで小型なのにパワフルで喜んでいます。

We used this great little box to replace a broken home stereo. Works perfect for what we needed. Pros: The sound is perfect for streaming movies, podcasts, talk radio, and background music. The blue tooth connection is nice so any of us can connect to it from our devices. Having treble and bass settings gives us the sound we want to hear. The connectors at the back handle bare wires easily. No need to get special connectors. Cons: The blue tooth connection is automatic. It means that if we want to play a movie from the computer which is direct connected, we have to all turn off blue tooth from our devices. I don't think this device is for anyone who wants to really play quality music at any decent volume. E.g. my daughter plays the Attack on Titan theme songs a lot, which is like playing 2 symphonies and Rush at the same time, and with so much going on, the music becomes indecipherable. It could be my speakers, but there was nothing I could to make the music sound crisp. Other reviews might help to straighten this out. I wish I didn't buy special connectors. :-/

Ho atteso prima di recensire proprio per completar un giudizio di performance più sicuro. Dunque posso testimoniare l’eccellenza dell’ampli della Fosi che fornisce un qualità molto buona. Un rapporto segnale rumore molto buono, una potenza ottima (spinge alla grande) e un buon controllo dei bassi ed alti. L’ascolto generalmente con sorgenti bluetooth e anche questo elemento ha una stabile connessione, pulita e di buona portata (distanza). Una nota sul surriscaldamento per uso esteso e a alta potenza: ho aggiunto una aletta di raffreddamento nella parte superiore che smaltisce molto ed evita potenziali blocchi. Nel complesso complimenti alla Fosi per lo standard qualitativo raggiunto !

The device sounds great and is easy to install. An additional digital USB input would be helpful for PC output. The knobs are too close together for comfort. I bought my second device now. It's the perfect solution for computer output or streaming to your loudspeakers. However, there is room for improvement: 1) There is enough space on the front plate to have more distance between the knobs. It's easier to turn the knobs if your fingers fit between the knobs. 2) I have to bend to see what the bass and treble knob are. The description would be more convenient on top of the knobs instead of being hidden beneath them. 3) The analogue-to-digital converter in your PC might be of low quality. A digital USB-C input could improve the quality and would be very convenient. 4) Earphones can skip forward and backward through your music list. You could add this functionality by pressing the bass and treble knobs respectively.

Works perfectly! I used this to fire up a pair of outdoor speakers that came with our house, and it’s been flawless. Super easy to connect via Bluetooth, and the sound quality is great — clear, strong, and consistent. I’ve left it on pretty much all the time, and it’s been running solid for about 8 months with no issues at all. For the price, this little amp delivers big performance. Highly recommend.