It is an improved version over the Pioneer design in a number of ways
1) The pcb material is much better, higher temp FR4 epoxy glass construction, LPI solder mask, double sided PHT, silkscreen legends
2) BYV34X-600 ,2x20A/600V low loss fast/soft recovery rectifiers with heatsinks
3) Precision resistors, Nichicon or equiv. 105c ecaps. All current production parts
4) Easy installation/service, using high current Terminal Block Connectors
5) Common relay footprint for Omron or Panasonic 16A parts, separate relay for each speaker pair
6) Replacement of obsolete PA-3004 IC with a discrete circuit design, performing the same function
Also see our AWR-157-B0 power supply as well
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