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Parts- Express 100 watt Class D digital amp with Bluetooth. $89 bucks.

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Latest email ad from Parts-Express has a decent looking little digital amp with a stated 100 watts per channel at 8ohms.  That is a decent amount of power for its size, with a bluetooth receiver too,  $100 dollars off. 


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36VDC x 4.5A = 162 watts input from the power supply.  That's the max power the thing can put out, both channels.  Then, 90% efficiency = 146 watts, or 73 wpc.  Enough, but I dislike PE's deceptive specsmanship. 

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