Attributes

Brand	-
Category	Root / Musical Instruments/Guitars/Pianos/Accessories
Origin	-
Brand	ESP
Model Series	MM-04 Boost
Signature Artist	Alexi Laiho
Circuit Type	Active Preamp
Gain Control	Variable Active Gain
Power Source	9V Battery
Compatible Instruments	Electric Guitars
Installation Type	Drop-in Replacement
Tone Profile	High-Output Metal
Country of Origin	Japan

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Rest in power Alexi, great gear

Buying this felt like honoring a hero. The performance matches the legacy. Fast shipping and well packaged by the seller too.

Anonymous

Mar 14, 2026

Rating: 5/5

Perfect tribute to a legend

This preamp captures that classic Alexi tone perfectly. The gain structure is tight and aggressive without getting muddy. Installation was straightforward in my standard strat body.

Anonymous

Mar 10, 2026

Rating: 4/5

Great sound, battery life could be better

The tone is fantastic for modern metal genres. Very clear highs and punchy mids. Just remember to unplug your cable when not playing as it drains the 9V battery quickly.

Anonymous

Mar 04, 2026

Rating: 4/5

Solid upgrade

Good build quality and authentic ESP feel. It took a little tweaking of my amp settings to dial it in perfectly, but once set, it sings.

Anonymous

Mar 04, 2026

Rating: 5/5

Transformed my cheap guitar

I installed this in a budget instrument and it sounds like a high-end custom shop guitar now. The active circuit really boosts the signal and clarity.

Anonymous

Mar 03, 2026

Rating: 5/5

Exactly what I needed for live gigs

Cuts through the mix beautifully. The boost function is smooth and doesn't introduce unwanted noise. Highly recommended for anyone playing heavy styles.

5 FAQ

Q: Can I use this with passive pickups or does it replace them?

A: This unit replaces your existing pickup system entirely. It is an active preamp and pickup circuit combined, not just a booster pedal.

Q: What is the warranty period for this item?

A: This product comes with a standard 1-year manufacturer warranty covering defects in materials and workmanship.

Q: Does this come with the battery included?

A: No, the 9V battery is not included in the package. You will need to purchase one separately.

Q: Is the gain knob push-pull for coil splitting?

A: No, the gain knob on the Alexi Laiho signature model controls the active gain level only and does not feature a push-pull coil split function.

Q: Will this fit in a guitar with standard humbucker routing?

A: Yes, the MM-04 is designed as a drop-in replacement for most standard humbucker cavities, though minor modifications may be needed for some non-standard bodies.

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