I have several of these Class D (BT) amps. This one is my favourite. I had to return several Fosi Audio for various reasons. you suck Thanks for bringing Raven back. I use a boost amp module to go from 12v to 21v. It seems to work best at 21V. It comes with a 19V power adapter. In terms of performance / fidelity. Aim high. I use 3.8 ohm speakers and this amp pushes them HARD and LOUD. Deep bass, crystal clear highs, huge dynamic range. It distorts at high volume, but everything is pretty loud at this volume. Bluetooth 5.0 is indeed much better and FASTER. In fact, it connects when I don't want it to. The bass/treble controls are very good (typical 8-10 dB boost/cut at 100 Hz or 10,000 Hz). The AUX input is secondary to Bluetooth. In other words, it only works when there is no BT connection. The switch is only for BT (no power switch). One thing I don't like is that I have to turn off the power with a separate switch (which cuts off battery power). This unit bangs speakers, which sounds like a cheap 1970's transistor radio (static). nobsound. Please fix this. Otherwise a great silly little amp with clear sound and great bluetooth connectivity. Win.UPDATE: Bought another one because they work well. Adjusted DC input power to 25V. Now it's really high! I am using a 12V DC boost amp. The $13 DZS sold here at Revain works great: https://www.amazon.com/gp/product/B078H527JZ/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1
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