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Join Date: Mar 2001
Location: Corpus Christi, TX USA
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From what I can tell, the amplifier is connected to the Sony’s Zone 2 outputs, which makes sense. The situation is that those outputs are straight and unprocessed, which is why the Sony’s tone controls have no effect.
All you need to do is get something like a vintage 10-band equalizer and insert it between the Sony and amplifier. These were popular in the 1980s.
If you’re not familiar with these, it’s basically a sophisticated tone control. Instead of one bass and treble control, you get filters for 3-4 bass frequencies; ditto for treble frequencies. And bands for midrange frequencies, too.
In addition to 10-band models, there were also 5- and 7-band models as well. You can find any of these in abundance in ebay – just get one from a major manufacturer.
Wayne A. Pflughaupt