MakerHawk Mini Amplifier Board Bluetooth Amplifier 2.0 2X50W 5V-24V Audio Power Amplifier Module for Store Home Theater Speakers

Very large sound from a small board. Almost lossless distortion. I had another set up on the bench for an mini in-dash BT/FM/Aux receiver/amplifier, so I just needed to swap in the speaker leads and the power supply. Used my variable voltage supply at 12V-2A. Connected to a pair of 3" full range (60-20k), 90 db sensitivity, 4 ohm speakers, 40W (specs call for 50-100W input). No noise issues at all (others that reported this likely misconnected the amp/speakers). Bluetooth sourced from my Fire tablet, found the device in seconds. Volume set on max on tablet, then tried various volume levels on the amp, including full out on Classic Metal on Slacker (I know, LiveXLive), no distortion discernable. Speaker specs recommend a passive radiator for improved bass, this was just a free air test. Played on Piano Jazz on Slacker, awesome sound. I really like the switched pot they used for volume - simply on-off and volume operation. Only thing I saw on initial test was the volume seemed to go out well before Off position, likely due to the pot value used, I'd give it a 4.5 for that....otherwise a 5 overall. I have a few 24V power and torroidal transformaers I may try for a permanent power source. This may end up a desktop or portable bluetooth speaker

Se ve de buen material, falta utilizarlo

Buen rendimiento y cumple con las espectativas.

Works perfectly for my application. I tested it at a range of supply voltages from 5VDC to about 20V and its sound quality remained good. Interestingly, the amp's output volume seems almost totally unaffected by any shift in supply voltage. However I saw nothing like a 50W per channel output. With the supply at 24V (max rated) and volume at maximum, connected to two 8-ohm speakers, playing some very lively music, the current draw was about 400mA, which amounts to just 9.6 watts. Even at 94% efficiency that's just 4.5 watts per channel. If the manufacturer can support a claim of 50 watts per channel, I'd like to see how the hell they're doing it. It might conceivably peak out somewhere around a third of that value for tiny fractions of a second. But I think it's intentional misrepresentation. If this weren't such a great little amp, the overblown claim would get more than just one star off my rating. It certainly IS efficient. Maxed out as above at 24V for about 15 minutes, it produced only barely-detectable heat. Powered by a single 2AH 18650 batttery on a boost converter (12V supply to amp), I ran it for more than 8 hours at well below max volume, driving two 8-ohm bookshelf speakers. (Max volume was uncomfortably loud in a medium-sized room.) Only when the battery output dropped well below the 3V input threshold of the boost converter and supply voltage to the amp had dwindled below 5V did the connection fail. The gradual supply voltage drop from 12V to ~5V had no discernible effect on the music volume.

Currently using with a 12V, 40A, 100% duty cycle power supply to drive some 6 ohm bookshelf speakers. If the specs are to be believed, this little board is supposed to be able to pump out 12W per channel at 12V with 8 ohm speakers so, my best estimate is that it should be able to provide about 15W per channel in my configuration. To be honest, I'm not sure I'm getting that kind of volume but, other than that, this thing is great. Sound fidelity is amazing for what this is. The BT connection tone is pleasant and not overly loud. Connectivity is good and I absolutely love the analog style volume control with off switch. The noise to signal ratio is really good (no hissing or popping).