The EQM-1A3 is an EQP-1A3 with the boost/atten pots replaced with precision 21-position switches. Tapers have been engineered to provide reproducible 0.5 dB / step control* with a maximum boost/atten of 10 dB. Specifications: 20, 30, 60, 100 CPS (Hz) shelf boost, 0 – 10 dB in 0.5 dB steps 20, 30, 60, 100 [...]