The second picture shows a total of 6 wires attached to the back of the unit. 4 would be for speakers, 2 for power and ground. No connection for memory "keep alive"? Power output to the speakers would be way down unless they are using some kind of on-board voltage booster to get higher voltage for the output circuitry. The good part is that it would easily fit in the dash hole for radio controls in 47-55.1 GM trucks.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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