Was looking at an old issue of Car Audio and came across this ad, don't know if these amps were made by PPI but the inside looks very similar to the way my 5075DX looks, and the model numbers are similar too,
see PBSP2300, PBSP2075, PBSP2050, PBSP4075, PBSP2100
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see PBSP2300, PBSP2075, PBSP2050, PBSP4075, PBSP2100
