This unit works perfectly on all frequencies except the lowest 30 hz. I have been using it and just leave the 30 hz all the way down.
Item Tag: SS-2
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ADC Sound Shaper Two Equalizer Pair Of SS-2 EQ Slider Caps EXC Cond Non Light 2
These are Non Lighted. They were used on different models as well. See all pictures for condition. 5/8″ Deep x 3/8″ Wide.
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ADC Sound Shaper Two 2 Vintage Stereo Equalizer 12 Band X2 EQ Parts Repair AS-IS
It is sold for Parts or Repair AS-IS. Most of the bass sliders do not change the frequencies. The mids seem OK and I’m not sure about the 2 high frequencies. My hearing is not great. All push buttons seem to work.