I bought this to convert a vintage radio into a BT speaker. At first everything was working fine, with a serious drawback that if you push the volume far enough it would "hick up" and stop when getting too much energy. The documentation says it can receive a tension between 9 and 24V and requires current up to 3A. The power supply I chose is an old computer one, at 19V and giving up to 3,42A.Speaker (mono) is a car coaxial speaker by JVC 30W. Should have maybe gone for the 21W (10cm diameter). But both are alright for the job.So this should not cause any "hickup".Because I wanted to use the radio location of the bass/treble original knobs. I removed and replaced the bass/treble potentiometers. These still work without problem. But since, the volume knob doesn't work anymore... I figured out you can adjust the volume thanks to an app, but this is not really as it should be...Of course, me changing things makes the garantee void. But be aware of these volume issues.

My son want this for his speakers. Works fine, his happy with the purchase.

Läuft seit Wochen sehr gut mit 15 Watt Lautsprechern und 12 Volt Einspeisung. Ins Gehäuse gebaut und ab die Post. Mit iPad in der Küche völlig ausreichend!

Comprato per sostituire l'amplificatore interno di uno speaker karaoke non funzionante, si assembla in un minuto, l'accoppiamento bluetooth è velocissimo, l'audio e il volume ragionevolmente gradevole, per questa cifra direi ottimo acquisto. Non è da dimenticare ingresso USB mp3, Regolazionie alti e bassi separati, alimentazione da 9volt fino a 24volt

Brought this to make a portable speaker. Didn't have high expectations as other reviews were inconsistent.Plugged into some old 200w speakers from an early 2000's hifi with a DeWalt 18v battery as a power source and I couldn't believe the sound that came out. On a par if not louder than the original hifi and probably 50x smaller. If the bass is turned up it sounds like it will damage the speaker. Sound is very crisp otherwise, could probably handle larger speakers. Louder and better quality than DeWalt tough system site radio

Lo utilizzo per accoppiare una smart TV, o lo smartphone, ad una coppia di diffusori Sony.La qualità audio non è eccelsa ed è necessario mantenere i controlli di tono verso il massimo.Ottima la soluzione del controllo volume, a step, con pulsante di accensione incorporato.Il bluetooth non ha ancora perso un colpo, raccomando solo di non innestare alcun jack 3,5 mm nella presa posteriore, altrimenti viene automaticamente disattivato.

Es ist ein schöner kleiner Verstärker der sehr einfach zusammen zu bauen ist. Der Klang ist erstaunlich gut. Kann ich ohne weiteres weiter empfehlen für kleine Bastler-Lautsprecher.