These complex controls offered greater flexibility tuning the system, as well as the room, and had become part of the natural landscape of consumer audio–though not too many Audiophiles embraced them because of damage to the sound. Running through groups of op amps and filters isn't exactly the purist's path. Add in massive phase shift when the tone controls are engaged, and what you gained in smooth amplitude was at the expense of good sound.
However, Audiophiles did embrace a graphic equalizer at one time, the much coveted Cello Audio Palette. Here's a picture of it.
Envisioned by Mark Levinson (the man) and designed by Dick Burwen (the engineer) the Audio Palette was blessed by the Audiophile community. It was functionally the same product as the Soundcraftsmen, but sounded much better because of the skill of the designer.
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