Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
Since you are asking for a twenty or thirty band EQ, I think you really mean to ask about graphic equalizers. They are the ones that have multiple fixed-frequency log-spaced bands, each one controlling the gain or loss of that band. Parametric equalizers usually have fewer number of bands, but the center frequency and bandwidth of each is adjustable as well as gain/loss. I prefer parametric, by the way.