I'm a hardcore audiophile, the kind who CAN hear a difference between different cables in my various systems. I'm also a vintage audio collector and recently got a JVC RC-M70 as a nice throw-back to my teenage years. But I wanted to add bluetooth capabilities to it and found this module as a possible solution.
I got this little amp today and before engineering its install in the boombox, I hooked it up to some spare speakers lying about to see how it would do in that role. I used a variable power supply (rated up to 30v and 5A) to test how it would perform with various voltages, and to see the current draw at different outputs. I also measured the temperature the unit ran at (to see if I'd have any problems with the case install.
Using some vintage speakers (Paradigm 9SE's @ 4ohms, Polk Monitor 5B's @ 6ohms and Yamaha passive studio monitors at 8ohms) I ran a broad range of music through it and... it was stunningly fantastic!
I was able to get over 100dB (db-A weighted) of clean, detailed, seductive sound of out this thing. Totally amazing.
The sound is predictably solid-state crisp. Folks looking for that old warm tube sound should look elsewhere. But this is not a harsh, dry amp at all. At this price point (and frankly at many times this price!) the sound is clean, crisp and surprisingly detailed. Sound staging is convincingly wide and nuanced, with speakers, while not disappearing in a way that high-end gear allows, certainly becoming less of a focus, the music becoming a nicely blended wall of sound.
After an hour of running this amp hard - the cooling fins measured about 34C - so I would not worry too much about putting it in a case - but this was without having installed the supplied covers. On that note - anyone complaining about having to "put this together" is mistaken. The amp is supplied with optional top and bottom panels and the volume knob not attached. That keeps assembly costs (and therefore the price to us buyers) lower, and leaves the amp ready for install in various DIY projects as needed. It's not like you get a bare PCB and a bunch of SMD bits to try and solder together. The amp is ready to play out of the box.
Others have noted that power supply matter a lot for this amp. While I haven't yet taken any measurements, I didn't hear a tremendous degradation in sound between 20V and 12V. Max amperage draw I saw was a transient .45A. Things get a little less pretty below 10V (But if the volume is kept low, you'll get away with it) and I was able to keep it running as low as 4.9V, but note - it won't power up and connect at that voltage. My goal is to power it with a 12V LioN battery. I suspect that will be sufficient.
Frankly - I'm completely blown away by both the power and fidelity of this tiny package. Class D is here to stay and I'm eagerly looking forward to how this is going to transform my old JVC boombox!
HIGHLY recommended.
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