Fosi Audio BT30D Pro Mini Bluetooth Amplifier Hifi, 2.1 Channel Subwoofer Amp, with TPA3255 Chips 165W x2+350W and Bass Treble Controls, for Home Desktop Outdoor Bookshelf Speakers Subwoofers

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.)

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.

This little thing is the best bang for buck hifi amp I've bought. It runs a passive 12" Sub in a sealed enclosure and a pair old JPW monitors with no trouble at all and thumps haaaard if needed. Banana plugs are nice and the spacing is good for decent cables. Barely warm playing at decent volumes too. Solid build. I like the tunability for the sub especially, makes it's super easy to balance the sound for your room/application/carnival level bass requirements. Didn't expect to use the Bluetooth much initially either is it's mainly for a DJ system but it's so easy and sounds good.. All in all, great little amp for a 2.1 system.

Just got this delivered, the sound is incredible for the price tag - wow! I have to add that I am not using the power supply that came with this, I bought a 48v power supply (from Fosi) as it will push the amplifier to a higher limit. Here is the bad part, the reason for a 4 star rather than 5. The box it came in, seem to been open - the seal was broken and a cable was missing. The missing cable was a part of the power supply (the one with the plug). As I ordered an extra power supply, I am fine for now. Yet I have a block that has no cable to plug into the wall socket. It always feel like a let down when you spend a chunk of your saved money to treat yourself and you receive a product that someone else have tempered with. Even tough I am happy with the quality of this little amplifier, I am thinking of returning it and go to a different brand.

Amazing what you get in such a tiny package, and at such a price. This little amp drives my Mission main speakers and a heavy dual 8" passive sub-bass! It takes a little bit of fiddling around to balance out the right settings for treble/bass and the two volumes, as these interact with each other. Fed with a decent signal (from an SU-1 DAC), it gives me clarity and separation and sound stage. Class D done right, with this TPA3255 amp. My only slight criticism is that I would have preferred the control that sets the bass cross-over point to the sub-bass, to also roll-off that bass to the main speakers so there's no clash with the sub. Very impressive piece of kit.

Great amplifier, extremely happy with purchase. Great sound and quality of amplifier. Lovely design and functionality.

It works, it's powerful enough, it's good value for money in that sense. However there are some significant compromises - there is no balance control and you can't turn bluetooth off. I don't want to use bluetooth, I don't want anyone else connecting to it either so I've removed the antenna and am hoping that's enough. My speakers also had to be repositioned because I was relying on a balance control on my last amp to account for one being slightly further away.

I needed a new amplifier to replace one that I fitted into the bottom of a bass speaker as part of a speaker system I designed and built during lockdown. I chose this amplifier based on: 1 The signal-to-noise ratio as background noise isn't what I want to hear 2 The amplifier had to fit into the base of my speaker as part of the 2.1 system 3 It was in the right price range for me I unpacked and set up the amplifier, switched on and waited for a click, pop, thump, or hiss - nothing! - the only way I could tell it was on was from the tiny red LED on the front panel. The amplifier fitted the space I had like a hand in a glove so the measurements are correct. I started playing some big band music, wound the controls to my liking and WOW it sounded fabulous. The bass through my home-made speaker is phenominal with the wind from the bass port able to be felt on my face almost a metre away! A perfect solution to my music collection on my computer. P.S. I don't use the Bluetooth connection as my Mac warned against it so I cannot comment on its function.