Pricing and availability

We compare 600+ stores and found this item at 6 stores. Prices updated .

Sweetwater
5.0 (6)
$125.99
Guitar Center
5.0 (11)
$125.99
Amazon
4.6 (121)
$125.99 New
$115.91 Used (Like New)
Reverb
5.0 (22)
$123.57 New
$49.99 Used
Musician's Friend
4.0 (26)
$125.99
Thomann
4.8 (231)
$125.00

Average Price: $115

Standard/Professional

$60

$151+

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Price History

Based on price data from 5 merchants for "MXR MC401 Boost/Line Driver". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

The MXR MC401 Boost/Line Driver is a versatile and effective piece of gear, designed to enhance your sound without altering your guitar's unique tone. Driven by the expertise of LA's sound whizz Bob Bradshaw, this pedal is your ticket to unlocking the full potential of your amplifier.

Whether you're looking to add a little extra gain to your optimal amp sound or seeking the perfect tool to bring out the best in your vintage Marshall, Fender, or Vox, the MXR MC401 is the answer. It's the perfect solution for guitarists who want to add volume and punch to their sound, without distorting the frequency response.

If you're seeking a responsive pedal that cleans up nicely when you roll back your guitar volume, this is the gear for you. It’s incredibly sensitive to picking dynamics, and unlike many boost pedals, it won't thin your tone. The MXR MC401 is all about providing a strong, clear lead sound, while maintaining the beloved signature tone of your guitar.

Key Features:

  • Developed by sound guru Bob Bradshaw
  • Adjustable from 0 to 20db boost
  • Doesn't distort the frequency response
  • Responsive to picking dynamics
  • Stable and robust housing
  • 1 Input and 1 output
  • Status LED (optional Dunlop ECB-003 AC power supply)

Product specs

Pedal Type Boost
Analog/Digital Analog
Inputs 1 x 1/4"
Outputs 1 x 1/4"
Power Source 9V DC power supply (sold separately)
Batteries 1 x 9V

FAQs

What is the primary function of the MXR MC401 Boost/Line Driver?

The MXR MC401 Boost/Line Driver is designed to enhance your guitar signal, providing a clean boost to improve volume and clarity without altering your tone.

Can the MXR MC401 Boost/Line Driver be powered by a battery?

Yes, the MXR MC401 can be powered by a single 9V battery, making it convenient for portable use without needing an external power supply.

Is the MXR MC401 suitable for use with both electric guitars and bass guitars?

Yes, the MXR MC401 Boost/Line Driver works well with both electric guitars and bass guitars, providing a clean boost that enhances the instrument's natural tone.

How does the MXR MC401 affect my guitar's tone?

The MXR MC401 is designed to provide a transparent boost, meaning it amplifies your signal without altering the original tone of your guitar.

What kind of power supply is needed for the MXR MC401 Boost/Line Driver?

The MXR MC401 requires a 9V DC power supply, which is sold separately, to operate. Alternatively, it can be powered by a 9V battery.

Equipboard's Expert Review

Equipboard tested this

Equipboard tested this

The Boost That Delivers

We found the MXR MC401 Boost/Line Driver to be a solid, no-nonsense pedal that delivers exactly what it promises. We've been using it for several months now, and it's quickly become a staple on our pedalboards.

From the moment we unboxed it, we were impressed by the build quality. It's compact yet feels like it could survive a nuclear blast - typical MXR durability. The single-knob design is refreshingly simple, though we did find the footswitch a bit stiff for our liking.

Controls are straightforward: one knob to dial in up to 20dB of boost. We appreciated the true bypass and the option to use it as a buffer. It's versatile too - we've used it successfully with both guitar and bass. The 18V power option for extra headroom is a nice touch, although we found the placement of the DC jack a bit awkward.

Sound-wise, this pedal shines. In our tests, it provided a clean, transparent boost that preserved our original tone beautifully. We found it particularly effective for making solos cut through the mix. The low noise floor is impressive, and it works wonders in the effects loop. However, we did notice some slight coloration when used with high-gain signals.

For us, the MC401 represents excellent value for money. It's a workhorse pedal that does its job without fuss. We think it's perfect for guitarists and bassists who want a reliable, transparent boost without breaking the bank. However, if you're looking for a boost that adds character to your tone, you might want to look elsewhere.

While it's not without its minor flaws, we found the MXR MC401 to be a dependable, high-quality boost pedal that delivers on its promises. It's become an essential part of our rig, and we suspect it will for many other musicians too.

Rated 5
ProGuitarShopDemos

ProGuitarShopDemos

MXR CAE MC-401 Boost Line Driver Pedal

Video thumbnail for MXR CAE MC-401 Boost Line Driver Pedal by ProGuitarShopDemos

MXR CAE MC-401 Boost Line Driver Pedal

ProGuitarShopDemos

ProGuitarShopDemos

Video thumbnail for MXR CAE Custom Audio Electronics Boost Line Driver by shnobel

MXR CAE Custom Audio Electronics Boost Line Driver

shnobel

shnobel

Video thumbnail for 1980 MXR Micro Amp vs CAE Custom Audio Electronics Boost Line Driver by shnobel

1980 MXR Micro Amp vs CAE Custom Audio Electronics Boost Line Driver

shnobel

shnobel

Video thumbnail for MXR MC401 Boost Line Driver pedal by Pherotone Studios

MXR MC401 Boost Line Driver pedal

Pherotone Studios

Pherotone Studios

Video thumbnail for MXR | MC401 Boost/Line Driver by Algam EKO

MXR | MC401 Boost/Line Driver

Algam EKO

Algam EKO

Video thumbnail for MXR“MC401 Boost/Line Driver” by maruhachi08

MXR“MC401 Boost/Line Driver”

maruhachi08

maruhachi08

Reviews

PROS

  • Pure, transparent boost without coloration, maintaining original tone

  • Simple one-knob design for ease of use

  • Durable, built like a tank

  • Low noise floor, very quiet when engaged

  • Works well in FX loop or in front of amp for versatility

  • Provides clean volume boost for solos to stand out

  • Can be powered with 9V or 18V for additional headroom

  • True bypass with a useful buffer for long cable runs

  • Affordable price point for its quality

  • Does not add gain or compression, perfect for clean boosting

CONS

  • The foot-switch may be too hard for some, requiring full pressure to activate

  • The LED light is excessively bright for some users

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about MXR MC401 Boost/Line Driver.

Features and functionality

  • The MC401's LF442 opamp can run at 18V, offering higher clean headroom and accommodating higher input levels without distortion.

    Source
  • The unused pins on the dual opamp are tied to a fixed reference to prevent issues from floating pins, which is a best practice not implemented in simpler designs.

    Source
  • The pedal uses a JFET-based switching system to short inputs and outputs to ground in bypass, reducing switch pop with a more efficient DPDT instead of a 3PDT.

    Source
  • The circuit includes a current source (Q1, R10, R11, D3, D4) for the LED to maintain constant current, differing from simpler resistor-limited designs.

    Source

Use cases and applications

  • When used in an effects loop, running the MC401 at 18V can enhance performance by providing higher headroom and reducing distortion.

    Source

Setup and maintenance

  • Owners are cautious about using 18V due to the lack of manufacturer confirmation regarding capacitor ratings.

    Source

Build quality

  • The use of a more complex LED and switching setup allows cost savings in mass production and is adaptable for use across multiple pedal designs.

    Source

Critic Reviews

MC401 CAE Boost/Line Driver Review: It's heavy duty, all black (must for guitar players) with a... | MXR | Guitar Effects | Reviews @ Ultimate-Guitar.Com

ultimate-guitar.com

The MXR MC401 Boost/Line Driver excels as a straightforward, robust clean boost pedal, delivering up to 20db of pure volume enhancement without altering your tone. Praised for its simplicity and durability, it stands out on pedalboards, especially for those who prefer their existing sound but louder. Designed by Bob Bradshaw, it's built like a tank to endure gigging conditions, making it a reliable choice for musicians. While it lacks tone-shaping features, its effectiveness as a volume booster earns it high marks. If you love your tone and need a boost, this pedal won't disappoint.

positive

MC401 CAE Boost/Line Driver Review: Its sound is so clean that I use it with acoustics... | MXR | Guitar Effects | Reviews @ Ultimate-Guitar.Com

ultimate-guitar.com

The MXR MC401 Boost/Line Driver is praised as a versatile and reliable pedal that provides a clean boost without affecting tone. Its ability to enhance dynamics when used before distortion pedals, and its aesthetic appeal with a sleek design, are highlighted. This pedal is deemed perfect for any style, with the flexibility of power options (9v/18v) impacting the boost level significantly. However, the review lacks any mention of downsides, making it an overwhelmingly positive take on this pedal.

positive
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5.0 out of 5

Based on 15 Reviews and 68 Ratings

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groovizm

The answer to the quest for a 'neutral' or 'transparent' overdrive pedal.

To me, a 'transparent' overdrive pedal is one that does NOT change the basic tone of my rig when turned on. I love this, because when my basic clean tone through the amp is good, I don't want to mess it up with a drive pedal that changes the EQ or the dynamics of my tone. And it seems many people want this, because many pedals are sold with the promise that they are 'transparent'...

I also found that really transparent pedals are very hard to find. Anthing based on a tube screamer circuit will cut lots of bass, for instance. If you find a pedal with good tone controls (like a Vahlbruch Kaluna) you can try to compensate for the difference in tone between pedal and amp with the tone controls.

To me the solution is to have your drive pedal allways on and at low gain. If the pedal changes the sound of your setup you can compensate for this using the EQ on your amp. But the trick is to find a combo of amp and pedal that works well together. Now you can simply play harder or use the volume control on your guitar to go into overdrive. Something like the Lovepedal "Church Of Tone" is designed specificcally to be used that way.

If you don't want to rely on the dynamics of your playing, or if the volume control on your guitar is crap and dulls the sound when turned down, than a boost bedal is also a good way of going from cleanish to dirty. The MC-401 does a marvelous job of this. It does NOT effect your tone and you can dial in anything between 0db to 20db of gain. I find +9db to be just right.

dorgsan

Plainest boost

No coloration at all, just pure volume. Takes both 9V and 18V for more headroom. If you want additional nasty fuzz-overdrive, you can buy MXR MC-402 Boost/Overdrive.

bradleydavis

All about dat BOOST!

I love this boost pedal so much! I owned a MXR Micro Amp for a while, but it seemed to color my tone a little too much (too much low end). The MC401 doesn't color my tone at all, but instead, provides a very natural boost that pushes my amp into natural overdrive. The boost is extremely articulate and produces throbbing palm muting and clear chords. If you're in the market for a boost or a buffer, I'd look no further. This pedal is affordable, sturdy, and sounds absolutely amazing!

z_rane

great clean booster

This is a great, uncoloured booster or line driver. Make use of the 18V option and get all the headroom you could ask for.

cwirus88

My number one boost pedal

One knob, simple design, built like a tank and nothing fancy-schmancy here. It's probably the most transparent boost pedal in the market - there is completely no coloration of tone, retains 100% of amp tone. I use it at a dead end of my chain to get only slight volume bump for some lead parts. It can be powered up to 18v to get even more headroom.

king_vice

Cannot live without

Since I am also a singer I like to keep my rhythm sound lower in the mix and let the rest of the band carry the melody. This little puppy allows me to jump over everyone when it's time to step away from the mic. All it does is boost. Does not color the tone in any way; which is what I want.

thanos_raksen

Reliable booster/driver.

I mostly use it after my overdrive to give a little more punch to the overall sound and volume.

From Gear Setup
metal_messiah

When I need a Boost/Line Driver I go with this one

I like the CAE/MXR Boost/Line Driver. It makes the sounds I need to Boost come alive. Like my OG Marshall BluesBreaker along with my Boss GE-7.

alvizha

All you expect from a boost pedal is here

This pedal suitable for giving an extra kick to the overdriven tone. With this one, just kick it on and simply takes you from rhythm/lead tone to solo tone and help you standing out to the front of the mix.

charlieysasi

Love it.

I didn´t think I would get to enjoy this one that much, but after using it a few times while playing live I just fell in love with the possibilities it offers. Gives my guitar and other effects a great sound without making way to much noise at a time. I just can´t regret getting it.

Artist usage

Add artist
See how Slash uses MXR MC401 Boost/Line Driver

Slash

Guitarist

Mark Knopfler’s Guitar Heroes

...
Verified via YouTube

The MXR MC401 Boost/Line Driver is used by Slash. Mainly to boost his solos and put him in the front in the mix.

See how Kevin Parker uses MXR MC401 Boost/Line Driver

Kevin Parker

Singer, Guitarist

Tame Impala

...
Verified via Photo

There's a MXR Boost/Line driver next to the Dyna Comp in this Kevin Parker's pedalboard photo

See how Zakk Wylde uses MXR MC401 Boost/Line Driver

Zakk Wylde

Singer, Guitarist

Pantera

...
Verified via Photo

On this of Dunlop's website, it lists some of Zakk's gear, including an MXR MC401.

See how Mick Thomson uses MXR MC401 Boost/Line Driver

Mick Thomson

Guitarist

Slipknot

...
Verified via Photo

Mick Thomson uses the MXR MC401 Boost/Line Driver pedal, as shown in a user-uploaded photo on Imgur.

See how Synyster Gates uses MXR MC401 Boost/Line Driver

Synyster Gates

Singer, Guitarist

Avenged Sevenfold

...
Verified via Photo

Synyster Gates uses MXR's Boost/Line Driver on his pedalboard according to Dunlop's website

See how Robert Trujillo uses MXR MC401 Boost/Line Driver

Robert Trujillo

Bassist

Metallica

...
Verified via Photo

Another one of Robert's pedals is a MXR MC401 Boost/Line Driver. This is according to Dunlop's official artist page.

See how Mike McCready uses MXR MC401 Boost/Line Driver

Mike McCready

Guitarist

Pearl Jam

...
Verified via Photo

In a Facebook photo shared by Eduardo Domanski, Mike McCready's pedalboard is shown featuring the MXR MC401 Boost/Line Driver, positioned just after the Xotic USA EP Booster.

See how Troy Van Leeuwen uses MXR MC401 Boost/Line Driver

Troy Van Leeuwen

Guitarist, Bassist

Queens of the Stone Age

...
Verified via Photo

Van Leeuwen's gear includes an MXR MC401, according to Dunlop's website.

See how Stephen Carpenter uses MXR MC401 Boost/Line Driver

Stephen Carpenter

Guitarist

Deftones

...
Verified via YouTube

At 3:00 of this Rig Rundown for Stephen Carpenter of Deftones, he shows off some of his gear, including an MXR MC401 Boost/Line Driver.

See how Geezer Butler uses MXR MC401 Boost/Line Driver

Geezer Butler

Bassist, Keyboardist

Ozzy Osbourne

...
Verified via YouTube

In the YouTube video "Geezer Butler Bass Rack Rig - 'Know Your Bass Player' (3/3)" by Which Bass, Geezer Butler is shown using the MXR MC401 Boost/Line Driver as part of his bass rig.

See how Tim Commerford uses MXR MC401 Boost/Line Driver

Tim Commerford

Bassist

Rage Against the Machine

...
Verified via YouTube

At 12:53 we can see in Tim's pedalboard that he has a MXR Boost-Line Driver

See how Kim Thayil uses MXR MC401 Boost/Line Driver

Kim Thayil

Guitarist

Soundgarden

...
Verified via YouTube

At 12:22 in this Rig Rundown for Kim Thayil of Sound Garden, his gear is displayed, showing his MXR MC401 Boost/Line Driver.

Album Usage

The MXR MC401 Boost/Line Driver has been featured on the following albums:

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use MXR MC401 Boost/Line Driver, it is most commonly used with the following gear.

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Community setups

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neilltupman

neilltupman

Gear IQ 344

arielposen

arielposen

Gear IQ 77

jeffikus

jeffikus

Gear IQ 85

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d_james2

Gear IQ 57

thanos_raksen

thanos_raksen

Gear IQ 271

neilrichardmurray

neilrichardmurray

Gear IQ 174

1 alternative for MXR MC401 Boost/Line Driver, curated by the Equipboard community.

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