The M288 Bass Octave Deluxe from MXR is a dual-voice octave pedal for electric bass guitar.

The M288 pedal utilizes "Constant headroom Technology" to provide high headroom and accurate tracking. The Dry knob mixes in your direct signal, while the Mid+ switch adds up to +14 dB of internally adjustable mid frequencies (400 or 850 Hz). There are control knobs for dialing in the perfect blend of the two voices, which include Growl for a throaty tone, and Girth for a deep tone. 

Input & Output Input: 1/4" / 6.35 mm
Output: 1/4" / 6/35 mm
Impedance Input: 1 MOhm
Output: <600 ohms
Noise Floor 85 dB (controls at mid position, A-weighted, 1 Vrms)
Bandpass Octave Bandpass: 8 to 64 Hz, -3 dB
Control Range Dry: -∞ to +2.5 dB
Girth: -∞ to +1 dB
Growl: -∞ to +6 dB
Mid-Range Mid+ Switch (internally adjustable)
Gain: +4 to +14 dB
Frequency: 400 or 850 Hz (switchable)
Bypass True hardware
Current Draw 14 mA
Power Supply 9 VDC
Dimensions (H x W x D) 2.8 x 4.5 x 5.8" / 7.1 x 11.4 x 14.7 cm
Weight 0.8 lb / 0.3 kg

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