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.)

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.

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.

Very good piece of kit. Discreet. No hum when music is not playing. Powers the Jamo 165s easily. Gonna see if i can put more speakers on it. Only thing I would suggest is having a knob for mids. Other than that it's very good. Well worth the £100.

I bought this based on the other reviews and am very pleased. This is a great, clear sounding little amp for the money.I am into audio, have been into hifi, studio and live sound for decades and this is perfect for a modest sized living room system or as an add-on to connect to a computer so you can set up some speakers and a sub.It's amazing how a little amp barely bigger than a tobacco tin can put out so much sound. Great stuff.If I had to nit-pick I would like additional controls for the sub, to modify the filter slope, it was a bit tricky to dial it in just right but not complaining, at this price point its great.

I’ll start by saying that if you just need an amp with bluetooth - don’t bother with this one and get the Fosi BT20A Pro - that model can be run with a 48v power supply which ups the wattage and will be more than enough for most people.This BT30D Pro however is perfect for me because I can easily play around with subwoofers to compliment the main speakers I use. You can easily pick up faulty high end subs on eBay/Facebook and simply bypass the broken amp sections and go straight from the Fosi.I also have one of these amps in my van being powered from an inverter. Two small tannoy satellites on the dash and a chunky 12” jbl sub in between the front seats which also acts as a table. I leave the volume up full whack, turn the bass almost right down on the satellites and tune the bass via the sub… all being bluetoothed from my phone. It can get some serious volume and quality at the same time.It’s great value for money and I don’t see how you could spend your money any better.

In terms of amplification, its good, but they didnt make the chips so thats not their merit. The terminals for my speaker wire were oriented so badly that it would be impossible to wire a sub in, let alone bi wire my l&r. On photos it shows as 12-36v but that isnt what mine is, its 19v min.