Thanks for the reply. When I referred to using a JVC pre-amp, this is from the 1970's and the pre-amp was rated at 25 watts, and can drive speakers all on its own, or be run into dedicated amps that would then boost the power further. I ran from the speaker wire out terminals to the sub's speaker wire in terminals, not the RCA's. The JVC pre-amp was before they listed watts by summing all the channels and whatever else they do now to rate watts. I am no expert on watt ratings, but it seems to put out as much power as something rated 85 - 100 watts per channel now days, but that's a different discussion.
You are right that it is not feed back, but simply a hum. In testing the cables, I have tried several pair and I experience the same problem with all. Therefore, I assume it is something in the plate amp of the sub as you suggest. After my last cooling off period and going back to my original splitter and cables, I have not been able to recreate the problem, but perhaps have not used the sub enough to build up the heat to create the problem.
If it is heat in the plate amp, I suppose replacement of the plate amp is easiest. Do you agree and what sources and brands do you recommend to run a dual voice coil 12" driver?
Thanks again for any advice!
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