Dear @barnettk : Both of these are one of best design ever for home systems:
https://www.ebay.com/itm/Klark-Teknik-DN-360-31-Band-Graphic-Equalizer-/293338831604
https://reverb.com/item/25923277-crown-eq2-stereo-11-band-graphic-equalizer-rare-excellent-condition
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
https://www.ebay.com/itm/Klark-Teknik-DN-360-31-Band-Graphic-Equalizer-/293338831604
https://reverb.com/item/25923277-crown-eq2-stereo-11-band-graphic-equalizer-rare-excellent-condition
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.