I recognize that most audiophiles do not look favorably upon consumer accessible EQ. The simplest signal path -- straight wire with gain paradigm is dominant. However, for those willing to consider something outside of the norm, I suggest you consider the following manufacturers' equalizers. Aphex, Drawmer, Manley, Summit, Tube Tech (all of the above are tube based designs) or Avalon, Focusrite, GML, Oram and Night Technologies. Prices range from $1,000 (the Aphex and Night Tech units) to slightly under $5,000 (Manley). These units are all well built and are essentially sonically transparent. Insert one of these equalizers into your system's tape loop and you'll never have to be afraid of a hearing impaired recording engineer again.