Audio control DQS Digital Equalizer.

Audio Control EQX (1ST GEN) 1/2 & 1 Octave Auto Equalizer Electronic Crossover

AudioControl EQQ 12 Band Precision Equalizer 4 Channel A Performance Match Comp

AudioControl DQDX 6 Channel Digital Signal Processor

AudioControl EQT Gen 1 / 30-Band 1/3 Oct Audiophile EQ Preamp SQ

Audio Control EQL Concert series 1/2 Octave Equalizer

AudioControl EQX 13-band equalizer with crossover 2.3 khz chip for Active setups

AudioControl EQL 2-Channel Trunk Mount Equalizer - Black