This is a Dayton APA150 INTAGRATED POWER AMPLIFIER 75 watts per channel in stereo , 150 watt in subwoofer mode. I had several of these for years. Test amp, I use them as rear channel vamp. Subwoofer amp. Blue tooth adaptor for outside use . The one in the photo is my old and shows it age, the left top showed when something was dropped on it. It still works just fine. The rely can be heard kicking in. And the blue light mean it is in working mode. I will send a copy of the manual . I will send it USPS. These sell for $219.99 thru parts Express. I am retiring, so all the toys must go.
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