DollaTek ZK-502M Audio Mini 2.0 Stereo 50W+50W bluetooth Digital Amplifier Module 50W*2 AMP Amplificador Home Theater AUX USB

Very easy to put together, and feels more robust as a pair of printed circuit boards connected with brass standoffs than an equally-cheap plastic housing would. The negative reviews seem to suggest it can burn itself out, but adding active cooling is extremely easy - it keeps its USB port powered when it's in the other modes, and there's enough current coming from it that its 5V output is keeping a 120mm PC fan meant to run on 12V spinning quickly enough to move air, but slowly enough to be silent. If you don't want to run a bodge, one of those pound-shop gooseneck USB fans for laptops would probably be just as good, and 50mm fans with USB cables are cheap too as people use them to cool 3D printer hot ends. When I was putting it together, I made sure to fit the little heatsink so that the fins are perpendicular to the edge it's closest to - I don't know how much of an actual effect that'll have, but it means the air can move through the fins rather than into the side of one. It seems to be fine with some pretty big speakers - I had a pair of Alesis M1 Mk. II active monitors die, victims of the capacitor plague, and I converted them to passives: each are now 8-ohm with 5.5-inch 75W woofers and 25W tweeters, and this thing, powered by a 20V 3.95A laptop PSU rescued from the dump, is able to run the pair of them fine. More than loud enough for a medium-sized room with no missing low-end. The photos make it look like it'll be too small for this to be possible...and it's even smaller in person. Brow-furrowing. If I haven't updated the review, assume it's still alive!

No instructions but didn't take long to work it all out. The heatsink doesn't stick very well. Powering it with a 24v 5a LED brick (photo attached, cabling is short as it was just a test). Neighbours probably not impressed after I gave it a good slog with some drum n bass... But hey, that's life! Noticeably louder than my other supposed 100w amp but also noticeably not as smooth sound-wise. A bit too much midrange but if you got an EQ you'll be tweaking it. My Akai speakers aren't exactly Bose. There's some stupid voice when you switch it on. The blue light on mine constantly flashes (I was running it through the audio socket to my smartphone, rather than the bluetooth) and I would recommend you turn the volume to minimum when you power it on or off. I had a rather loud click through the speakers. For this price, it's hard to complain about the negatives. I'm going to give it full marks despite all the quirks listed above. Dollatek, take note: Get rid of that stupid voice on startup and the flashing blue light and you've got a cheap and very cheerful amplifier.

it cant really run on 5 volt very well without cutting out, maybe 5volt 2 amp but not really off a power bank but 9 volt or more works fine and its bluetooth works really well, soundwise its really not bad

This tiny amp has an amazing amount of humph, and is also quite noise free. Impressive little piece of kit.

They come with a tiny bit of "assembly" required, but this only takes 5 minutes with the tiny screwdriver provided. It connects very quickly to either of my phones and the sound quality is pretty darn good considering the price. Take the "50 Watts per channel" with a pinch of salt though. I don't know what the "real" output ("RMS") is, but I am not running a disco with it, just background music through a pair of medium sized (Pioneer) Hi-Fi speakers and it is certainly loud enough for that.

I bought this as my son wanted some speakers for his PC (instead of using his headset all the time). I have loads of standard speakers from over the years so I wanted a small cheap amp to make him a little setup. This little amp is great, it comes requiring assembly, it's very easy to put together but makes you feel like you've built it. I powered it with an old 12v 1amp PSU and it works fine. I've had my phone Bluetoothed to it, easy to connect, sound was perfectly fine using a small set of satellite speakers. Just for a laugh I hooked up my floor standing Eltax speakers and surprisingly this little amp ran them, and sounded fantastic. I've ordered another to run the speakers in the bathroom meaning I can Bluetooth Alexa to the bathroom whilst I have a soak after a hard day's graft.

Good little amp with decent volume and inputs. Unfortunately gave up after about 5 months of use. Couldn't get in touch with customer care so contacted Amazon directly and they refunded the purchase.

Surprised how good this little gadget is. Works very well and quick and easy to assemble. Just what I was after to enable me to effectively plug my old hifi speakers into my Macbook.

Un buen aparato, no lo puedo negar, se escucha bien, aunke da algún problema de vez en cuando con el bluetooth, xo si usas Jack o usa va de lujo

Fonctionne bien, remplace un ampli pour un PC.

Was not expecting that high quality and volume for that size and price. Playing it with bookshelve speakers and a 12v 2amp power cord I had lying around. If you are looking for a small and cheap amp, here you go!!!

Hifi Qualität darf man nicht erwarten, aber der Verstärker funktioniert super .

Una piacevole sorpresa: la consegna è avvenuta nei tempi previsti e anche se ho installato questa tipologia di apparati per la prima volta, l'installazione si è rivelata molto semplice, soprattutto perché avevo già l'impianto audio predisposto e avevo già in casa un trasformatore da 24V inutilizzato. Una volta predisposto tutto, il dispositivo si è collegato rapidamente via Bluetooth, senza complicazioni o necessità di password, rendendo l'utilizzo immediato. L'ho installato in un negozio, dove cercavo una soluzione audio semplice e funzionale, senza componenti di ricezione radio. La potenza di 50W + 50W garantisce un'ottima resa sonora, perfetta per l'ambiente in cui l'ho inserito. In definitiva, è un prodotto pratico e dal buon rapporto qualità-prezzo. Lo consiglio a chi cerca un amplificatore compatto e affidabile. Ad eccezione dell'alimentazione, in dotazione è presente tutto la strumentazione necessaria per procedere con l'installazione.