– 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.

I decided to give this little BT30D Pro unit a shot to see if I could breath some life into an old pair of Gale Model 4 Floor stands. I was blown away by the sound quality. They're rated at 6 Ohm, 10-120 Watts with a freq response of 38Hz-22kHz so they matched the BT30D Pro perfectly. They sounded better than I ever thought they could. I enjoyed the great range of sounds from punchy bass, warm mids and clean crisp highs. I had to adjust the volume to half way for bluetooth and back to 9-10 O'clock for my Pioneer CD player. Both sources sounded amazing, but I felt the CD player had the edge. To my ears there is a sweet spot with the volume where the separation was at its best, below that the sound felt flat. Unfortunately, there was a fault with the power switch when it arrived. I had to flick it on/off 3 times every time before it would power up. I contacted Amazon support and they were amazing and arranged a refund. I was reluctant to return it but I couldn't take the chance it might pack in completely. Despite the hassle, I decided to give Fosi a second chance, and I ordered the BT20A Pro because I don't plan on adding a passive sub. If I do add a sub, it'll be an active sub and this unit, just like the 30D, has a pre-out. Fingers crossed I'll have better luck with that one. The QA issue that should have been caught in the factory, and the volume sweet spot is why I'm docking a star.

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.

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.

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 !

I'm writing this review after using this amp with full attention...it outperform as per its size. delivers excellent sound quality. it is compatible with my bose acustimas 5 series III drive them without any problem. bluetooth connectivity is excellant i hand no problem to connect it to my samsung phone...it matians the slound quality too... people might be missusing the return policy or might not have read the specifications before buying

omdat je de totale controlé hebt over het geluid en hoge en lage tonen en zelfs de frequentie en volume van de subwoofer is deze model een van de beste, ik heb het zodanig aangepast dat ik zelf een centrale speaker kon installeren met een krachtige bose sub woofer . Het is zeker een aanrader ik heb eentje beneden voor mijn Tv en ik heb eentje boven in de geluid studio voor mijn Krk speakers prachtig geluid.

Compared to the BT30D non-Pro, the Pro version is quite a bit longer and heavier (430g vs 620g). The knobs are made of aluminium, different texture compared to the no-pro, a bit more resistance to turn than the. Same throw switch used to power on. The 3.5mm PRE OUT is full range. Bluetooth will be always-ON so your neighbor can hijack your device just like the non-pro version. Remove the antenna to prevent this from happening if you don’t use BT. Come on Fosi Audio, please fix this. The amp has a 4” tall BT antenna, again it's better than the 7” incher of the DA2120C that looks like a CB radio... Please give us the 1 incher for future products, for once the smaller the better. BT uses an ATS2853 chip that is also found on the BL20A. How does it sound? I did a comparison with Onkyo RZ50 pure output mode (airplay), Aiyima T9 (BT), and the BT30D non-Pro (BT). All using RP5000F towers, with an amp selector switch. Right away there’s a BIG difference between the non-Pro and the rest. The Pro version is much more dynamic, the voices are clearer, bass is more present and punch harder. I honestly cannot tell any audible difference between the RZ50 and the BT30D Pro. The T9 sounds only a tad warmer (thx lamp); Even that it was really hard to tell and it depends on the song being played. The Pro version sounds definitely better than the non-Pro. To test the passive sub output, I hooked up my gutted Z2300 logitech subwoofer, it works wonderfully and has a very capable output. However, I didn't like the sub crossover control, the adjustment doesn't feel linear. There are no frequency indications on the knob, it can only be tuned by ears. The muscle: TPA3255 x 2: PSU idle voltage: 32.3V Power adapter output @ 8ohm load current and voltage, 125W: Same 32V5A adapter used for multiple models. No sparks occurred while plugging in the DC plug compared to the DA2120C I've tested, I made multiple attempts to make sure this is repeatable. Here I am trying to figure out the max usable volume before getting a bad shaped sine wave, The volume knob is at 3 o'clock, BT reference volume maxed out on my mobile device, no EQ, no tone. L & R Channel, 8 Ohm load, 1000hz tone, 26Wrms per channel L & R Channel, 8 Ohm load, 1000hz tone, clipping at 60Wrms L & R Channel, 4 Ohm load, 1000hz tone, 40Wrms per channel L & R Channel, 4 Ohm load, 1000hz tone, clipping at 100Wrms Sub channel @ 4 Ohm load, 75Wrms: Sub channel @ 4 Ohm load into clipping, 121Wrms: Noise, tested with max volume: BT30D non-Pro, audible hiss from speakers during powerup, circuit shuts off when no input signal for 5 secs to prevent constant hissing. BT30D Pro, barely audible hiss from speakers, you have to stick your ear on the tweeter to hear it. no circuit to shut off the signal, it's not needed because it is not audible sitting away from speakers. The TPA3255 chips are hungry AND efficient. If you can feed them, they will put out a respectable amount of power for its size. You can upgrade to a 36V power adapter if you are looking to squeeze more juice out of it. It seems most of the manufacturers using this chip have set their bottleneck to the power adapter. If you are looking for a 2.1 amplifier with passive sub output, look no further. The BT30D Pro is way better than the non-Pro version. Pros: Great build quality Excellent sound quality, to my ear it’s on par with the Aiyima T9 and RZ50 Low noise floor Runs cool and efficient Cons: Cannot turn BT off Sub frequency needs indication and more linear tuning Smaller BT antenna please

He comprado este amplificador Fosi BT 30 D, al ver las especificaciones. Voy a dar mi opinión sobre este modelo en concreto. Este aparato es un poco mas grande que otros modelos, y lo bueno es que trae una fuente de alimentación de 48 Voltios. viene bien empaquetado en una espuma de alta densidad que lo protege de cualquier golpe. Para conectarlo he usado cable de 2,5 mm con unas bananas marca VCELINK, los altavoces tienen una P. 100W, 8 Ohmios, y una (SPL)de 90, Marca Celestion. El subwoofer es un Yamaha activo. El amplificador me a sorprendido que para lo pequeño que es tiene mucha potencia, suena muy bien, y no distorsiona para nada, para regular el subwoofer lo tienes que hacer con el oído, hasta encontrar el equilibrio para no escuchar vibraciones. Se conecta al bluetooth, rapidísimo, lo he tenido por mas de 4 horas seguidas funcionando a una potencia alta y no distorsiona ni pierde potencia, y tampoco se calienta en exceso. He probado otro modelo Fosi BL20C, y el sonido es mas cálido, y como su otro hermano, muy potente. Espero que os sirva de algo mis reseñas, me parece un buen producto con un precio decente.