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The next step involved building the interface between the 25-pin connector and the amplifier. This interface carries the 4 line-level signals, 4 speaker-level signals, and the amplifier turn-on power.
I was fortunate to locate connectors at Radio Shack which matched the pin spacing of each row of the 25-pin connector.
I cut and tinned the ends of 6 foot sections of speaker and power turn-on cables, and attached them to the connector block for the a/d/s/ amplifier. I snapped together 5 of the PC terminals, and attached the other ends to them.
I used the following pinouts for the 25-pin connector.
I connected the PC terminal block to the 25-pin connector, and secured the bundle with cable ties. The PC terminal blocks are too thick to allow them to be used in both rows, so I milled some material from the rear of the second row of blocks, and inserted them into the 25-pin connector
I purchased a set of Monster Cable RCA cables, cut them in half, and stripped the ends. I soldered together the ground braids, and tinned the ends.
I then connected the RCA cables to the terminal blocks, and secured the bundle with more cable ties. I used hot glue to help secure the terminal block strips to the 25-pin connector.
