The MXR Custom Audio Electronics MC401 Boost/Line Driver is a professional-quality clean boost designed with Custom Audio Electronics.

Offering up to +20dB of transparent boost, it can be used to lift solos, push an amplifier or drive pedal harder, restore level through larger pedalboards, or help maintain clarity across longer cable runs.

Its simple single-control layout makes it easy to integrate into almost any guitar or bass rig.

Clean Boost & Line Driver

The MC401 provides an adjustable 0dB to +20dB boost.

It works well for:

• Solo boosts

• Driving valve amps

• Pushing overdrive pedals

• Restoring signal level

• Larger pedalboards

• Longer cable runs

Its low output impedance also allows it to function as a line driver, helping maintain signal strength through more complex rigs.

Simple Controls

Operation is deliberately straightforward:

• Boost – Adjusts output level from 0dB to +20dB

• Footswitch – Engages or bypasses the pedal

• LED – Shows effect status

Key Features

• MXR Custom Audio Electronics MC401

• Boost / Line Driver

• Developed with Custom Audio Electronics

• Up to +20dB clean boost

• Transparent boost character

• Line-driver functionality

• Single Boost control

• True hardwire bypass

• 1MΩ input impedance

• 150Ω output impedance

• 9V battery operation

• External 9V DC power

• Approx. 1.5mA current draw

• Rugged MXR enclosure

• Pre-Owned

Condition

Pre-Owned

This pedal may show cosmetic signs associated with previous ownership and normal pedalboard use.

It remains fully functional and ready for rehearsal, recording or live performance.

Please study the listing photographs carefully for the individual cosmetic condition of this pedal.

What’s Included

✔ MXR Custom Audio Electronics MC401 Boost/Line Driver

✘ No Power Supply Included

Power Requirements

The MC401 can be powered by:

• 9V battery

• Suitable 9V DC power supply

Current consumption is approximately 1.5mA.

No external power supply is included.

Checked & Tested

This pre-owned MXR MC401 has been checked by the Fair Deal Music team for general operation before being offered for sale.

Ideal For

• Clean solo boosting

• Valve amp boosting

• Gain stacking

• Large pedalboards

• Long cable runs

• Guitar

• Bass

• Live performance

• Studio rigs

Fair Deal Music Verdict

The MXR CAE MC401 Boost/Line Driver is a simple but extremely useful pedalboard tool.

Its +20dB clean boost makes it ideal for solos or pushing an amplifier harder, while the line-driver function helps maintain signal strength across longer or more complex rigs.

The compact format, true bypass and very low current draw also make it easy to add to almost any setup.

Supplied without a power supply, this is a strong pre-owned option for players looking for a transparent boost with genuine signal-management benefits.

Fair Deal Music is an independent, family-run music retailer established in Birmingham in 1987.