Pricing and availability
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Price
Average Price: $115
Standard/Professional
$60
$151+
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Budget
Standard
High-end
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
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What is the primary function of the MXR MC401 Boost/Line Driver?
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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.
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Can the MXR MC401 Boost/Line Driver be powered by a battery?
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Yes, the MXR MC401 can be powered by a single 9V battery, making it convenient for portable use without needing an external power supply.
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Is the MXR MC401 suitable for use with both electric guitars and bass guitars?
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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.
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How does the MXR MC401 affect my guitar's tone?
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The MXR MC401 is designed to provide a transparent boost, meaning it amplifies your signal without altering the original tone of your guitar.
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What kind of power supply is needed for the MXR MC401 Boost/Line Driver?
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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
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.
Videos
ProGuitarShopDemos
MXR CAE MC-401 Boost Line Driver Pedal
Reviews
PROS
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Pure, transparent boost without coloration, maintaining original tone
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Simple one-knob design for ease of use
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Durable, built like a tank
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Low noise floor, very quiet when engaged
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Works well in FX loop or in front of amp for versatility
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Provides clean volume boost for solos to stand out
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Can be powered with 9V or 18V for additional headroom
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True bypass with a useful buffer for long cable runs
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Affordable price point for its quality
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Does not add gain or compression, perfect for clean boosting
CONS
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The foot-switch may be too hard for some, requiring full pressure to activate
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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
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The MC401's LF442 opamp can run at 18V, offering higher clean headroom and accommodating higher input levels without distortion.
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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.
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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.
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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
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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
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Owners are cautious about using 18V due to the lack of manufacturer confirmation regarding capacitor ratings.
Source
Critic Reviews
5.0 out of 5
Based on 15 Reviews and 68 Ratings
533
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.
838
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.
609
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!
498
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.
514
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.
215
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.
271
Reliable booster/driver.
I mostly use it after my overdrive to give a little more punch to the overall sound and volume.
656
390
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
The MXR MC401 Boost/Line Driver is used by Slash. Mainly to boost his solos and put him in the front in the mix.
There's a MXR Boost/Line driver next to the Dyna Comp in this Kevin Parker's pedalboard photo
On this of Dunlop's website, it lists some of Zakk's gear, including an MXR MC401.
Mick Thomson uses the MXR MC401 Boost/Line Driver pedal, as shown in a user-uploaded photo on Imgur.
Synyster Gates uses MXR's Boost/Line Driver on his pedalboard according to Dunlop's website
Another one of Robert's pedals is a MXR MC401 Boost/Line Driver. This is according to Dunlop's official artist page.
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.
Van Leeuwen's gear includes an MXR MC401, according to Dunlop's website.
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.
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.
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.
Community setups
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