Hi, I have 14 Nuforce V2 class-D amplifier boards for sale with different input voltages:
6 x 24V input (30W RMS), 175 USD / board
6 x 36V input (75W RMS), 225 USD / board
2 x 48V input (160W RMS), 275 USD / board
These are normally not available to the DIY market but due to a finished project...