Maxon OD-9 Pro+ Overdrive

A "Boosted" OD-9: The Nine Series Takes the Concept Further

The OD-9 Pro+ follows the lineage of essential Japanese overdrives, featuring the DNA of a mid-focused circuit designed to "wake up" an amp or tighten saturation. Maxon evolves the formula with a more generous gain stage and especially options tailored for the stage: an activatable mid boost and switchable operating voltage to gain fullness and responsiveness.

For Which Guitarist, Styles, and Contexts?

The Maxon OD-9 Pro+ suits both the beginner guitarist looking for their first "real" overdrive pedal and the experienced musician wanting a reliable foundation to build a tone. In blues and rock, it serves as the main drive, with a singing grain and nice natural compression. In hard rock and metal, it becomes an excellent boost tool in front of a saturated channel: the Mid Boost helps cut through the mix, tightens the low end, and makes palm mutes clearer.

In the studio, it is valuable for stacking gain stages cleanly; live, its simple operation and mechanical bypass make it a "no surprises" pedal. It is notably found on rock/metal pedalboards, including those of Ola Englund, Terrance Hobbs, and Tim Howley.

Controls, Modes, and Design: Simple on the Surface, Formidable in Practice

On the front panel, the essential ergonomics are present: Drive for saturation level, Tone to adjust brightness, and Level to set output volume to push the amp's input. Added to this is a Mid Boost switch that enhances mids (ideal for leads), as well as a 9V/18V selector: at 9V, the behavior is more "vintage" and compressed; at 18V, the sound opens up, dynamics increase, and the pick attack becomes more precise.

The True Bypass switching preserves the signal when the pedal is off, and the pedal can run on a 9V battery or via an external DC power supply (pedalboard format).

The Sound

The OD-9 Pro+ offers a singing overdrive, mid-centered, that thickens the guitar without drowning it: perfect for adding body to single coils or bringing definition to humbuckers in a dense mix. The response to playing remains very musical: lowering the guitar volume cleans up the grit easily; playing harder yields more bite. The Mid Boost (+3 dB at 800 Hz) acts like a "spotlight" on presence: riffs become clearer, solos cut through without excessive volume increase, and sustain feels more apparent.

In 18V mode, the pedal gains headroom and articulation: chords remain more distinct, the low end is better controlled, and the attack becomes firmer-a real plus with high-output pickups.

Technical specifications

Effects	Distortion / Overdrive / Fuzz, Overdrive	Type	sector
Technology	Analog	Use	electric guitar
Format	Pedal	Color	Green
EQ	Tone

Guitar effect pedal	overdrive	Input impedance	500 kOhm
Op amp	JRC4558	Output impedance	10 kOhm
Mid boost	+3 dB at 800 Hz (Mid Boost)	Width	74 mm
Switching	True Bypass	Length	124 mm
Adjustments	Drive, Tone, Level	Height	54 mm
Input	6.35mm mono jack	Weight	0.58 kg
Output	6.35mm mono jack