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The AP-3 ensures the harmonic richness of passive sounds with the advantages of active control. There are a great variety of wiring options and the midrange frequencies (400Hz-770Hz) can be selected with push-pull or mini-switch. Real true bypass. Pots, push-pull and mini-switches are supplied. Bass: +/- 14dB (100Hz) Middle: +/- 14dB (400Hz-770Hz) Treble: +/- 14dB (5.5 KHz) Controls: 50K linear pots with center detent Power supply: 9V Size: 25x40x13.5mm Versions: AP-3 3 pots for trebles/mids/basses control + 1 mini-switch for mid-range frequencies selection (400Hz-770Hz). AP-3 PM 2 pots for basses and trebles control + 1 push-pull for mid-range frequencies selection (400Hz-770Hz). Bypass with mini-switch. AP-3 PB 2 pots for basses and trebles control + 1 push-pull for bypass and mids control. Mid-range frequencies selection (400Hz-770Hz) with mini-switch. AP-3 PMB 1 pot for basses control + 1 push-pull for mid-range frequencies control and selection (400Hz-770Hz) + 1 push-pull for trebles control and bypass. AP-3 ST 1 concentric pot (double) for basses and trebles control + 1 pot for mids control. Mid-range frequencies selection (400Hz-770Hz) with mini-switch. AP-3 ST PM 1 concentric pot (double) for basses and trebles control + 1 push-pull for mids control and midrange frequencies selection (400Hz-770Hz). Bypass with mini-switch. AP-3 ST PB 1 concentric pot (double) for basses and trebles control + 1 push-pull for bypass and mids control. Midrange frequencies selection (400Hz-770Hz) with mini-switch.