fixed crossover setting...sub pre out


Have older Sherwood rd 6500 ave with sub pre out....although the manual doesn't specify a crossover frequency...it had small or large speaker settings...should I assume 80hz...how do I know?
128x128phasecorrect
You can get an inexpensive SPL meter at a Radio Shak and buy a test record or CD wich has the frequencies on separate tracks. That is one way to measure it.
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