MXR M288 Bass Octave Deluxe – Dual-Voice Analog Octave Pedal
Add Massive Low-End Depth to Your Bass Rig
The MXR Bass Octave Deluxe is a dual-voice analog octave pedal designed to deliver organic sub-octave tones with exceptional tracking and studio-grade headroom. Whether you're looking to add subtle thickness to your clean tone or unleash earth-shaking low-end for funk, rock, or experimental playing, this pedal provides a wide range of tonal options in a compact, road-ready enclosure.
Dual-Voice Octave Design
The M288 features two independent analog sub-octave voices, each with its own dedicated control knob:
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Growl: Controls the volume of a throaty, midrange-focused sub-octave voice, adding bite and definition to your low-end.
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Girth: Controls the volume of a deep, smooth sub-octave voice, providing massive low-frequency weight without muddiness.
Dry Signal Control and Mid+ Switch
A dedicated Dry knob allows you to blend your original clean bass signal with the octave effect, giving you complete control over the balance between your direct tone and the sub-octave layers. The Mid+ switch adds up to +14dB of internally adjustable midrange boost, with selectable frequencies of 400Hz (low-mid punch) or 850Hz (midrange pop) via an internal slider. This feature helps your bass cut through the mix during solos or dense arrangements.
Constant Headroom Technology (CHT)
Powered by a single 9-volt battery, MXR's proprietary 18-volt Constant Headroom Technology (CHT) provides exceptional headroom and superior tracking. The CHT circuit utilizes voltage step-up techniques to deliver a constant 18-volt headroom regardless of source voltage—even from a used battery down to 4.5 volts. This ensures consistent performance and reliable tracking across the entire range of your bass, from the low E up through the higher registers.
Road-Ready Construction
The Bass Octave Deluxe is housed in a durable, lightweight aluminum casting with high-quality jacks and switches that have made MXR pedals the standard on pedalboards worldwide for over 30 years. True hardware bypass ensures your signal remains pure when the effect is disengaged.
Key Features
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Dual-Voice Analog Octave: Two independent sub-octave voices—Growl (throaty midrange) and Girth (deep and smooth)
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Dry Control: Mix your direct bass signal with the octave effect for parallel clean tone
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Mid+ Switch: Adds up to +14dB of internally adjustable midrange boost at 400Hz or 850Hz
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Constant Headroom Technology™ (CHT): 18-volt headroom from a single 9-volt battery for superior tracking
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True Hardware Bypass: Preserves signal integrity when the pedal is off
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Organic Analog Tone: Warm, musical sub-octave character
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Compact and Durable: Lightweight aluminum housing that fits any pedalboard
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Road-Ready: High-quality jacks and switches built to withstand years of use
Specifications
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Model: M288
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Input Impedance: 1 MΩ (Effect On)
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Output Impedance: 600 Ω
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Bypass: True Hardware Bypass
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Signal to Noise: 94dBV A-weighted (Vref 1V RMS)
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Octave Frequency Bandpass: 8Hz–46Hz, -3dB
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Trigger Threshold: 70dBV @ 100Hz
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Dry Output Control: -∞ to +2.5dB (MID+ out)
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Dry Output Response: 20Hz to 20kHz, +0/-1dB, -3dB @10Hz
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MID+ Switch: Dry Signal Midrange Boost, 400Hz or 850Hz (Internally Selectable), +4dB to +14dB (Internally Adjustable)
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Girth Control: -∞ to +1dB @ 100Hz
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Growl Control: -∞ to +6dB @ 100Hz
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Power Requirement: Standard 9-volt battery or 9VDC adapter (5.5mm x 2.1mm positive barrel, negative center)
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Current Draw: 14mA
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Housing: Durable, lightweight aluminum
Why Choose the MXR M288 Bass Octave Deluxe?
For bassists who want to expand their tonal palette with rich, analog sub-octave textures, the M288 Bass Octave Deluxe delivers. The dual-voice design allows you to blend deep, smooth Girth with throaty, midrange Growl, while the Dry knob and Mid+ switch provide precise control over your clean signal and midrange presence. With MXR's Constant Headroom Technology ensuring consistent 18-volt performance from a single 9-volt battery, this pedal offers reliable tracking and exceptional headroom. Whether you're playing funk, rock, metal, or experimental music, the M288 is a versatile tool that belongs on every bassist's pedalboard.
Massive low-end. Analog warmth. Built to perform.
Order your MXR M288 Bass Octave Deluxe today.
