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So far I've tried four different guitars. I think the most impressive part is how it accentuates the low bass notes, 80Hz and 220Hz. Because of this, you can record with the guitar mic much closer to the sound hole and get less vocal bleed!
David Wilcox
"Rezacore is unlike any other acoustic product on the market. It provides a natural compression, and refined overtone harmonics while at the same time impacting clarity and control to the root notes of a chord; applications in both live performance and studio settings are an exciting development in the world of acoustic guitars"
Eric Cinnamon
Producer/ Sound engineer
eVER TRY A PASSIVE SOLUTION LIKE THIS?
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At its core, Rezacore is a simple, passive way to get more out of your acoustic guitar. It installs directly into the sound-hole and helps improve tone, clarity, and overall balance — no gear, no cables, no fuss.
1. Made from sustainably selected tone-woods
2. Installs safely with no permanent changes to your guitar
3. Works with guitars that have sound-hole volume or tone controls
4. Equally at home on stage, in the studio, or on the couch
5. Contains no electronics — reduces feedback issues without compromising tone
6. Designed for everyone from beginners to world-class players who care about sound
7. Available in standard and custom sizes to fit your sound-hole properly
Community
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How Rezacore serves professionals
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Enhances clarity, note articulation, and projection so parts cut through in a mix or live band context, helping pro players deliver cleaner performances.
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Improves sustain, resonance, and tonal balance across the guitar’s body, giving artists a bigger, more “record‑ready” sound without relying on heavy EQ or processing.
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Non‑electronic, snap‑on design means faster, tool‑free setup for touring, backline, or multi‑guitar rigs, while preserving the guitar’s natural character and aesthetics.
How Rezacore benefits everyday players
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Makes an existing acoustic feel “more expensive” by adding warmth, richness, and clarity, so strumming, fingerstyle, and simple chords sound more satisfying.
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Works with entry‑level through professional guitars, so new players and casual hobbyists can access better tone without upgrading instruments or learning electronics.
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Simple, sleek, recyclable tonewood design keeps installation approachable and non‑intimidating for non‑techy users.
Videos and Testimonials
Pro Testimonial
A special "thank you" from all of us at Team Rezacore to Marlon Gibbons!
In this video you will witness his true, unedited, heart felt interpretation of his experiences using the Rezacore with his acoustic in studio and live settings for over a year.
Studio Ready Sound
For anyone new to it: the Rezacore is a passive insert that sits in the sound-hole of your acoustic guitar. It doesn’t amplify anything or change your setup — it simply helps the guitar resonate more evenly, improving balance, clarity, sustain and focus.
Signal chain:
Guitar: Taylor 417e-R
Mic: Soyuz 013 FET
Interface: UA Apollo 8
Pro Artist
Another special "thank you" from all of us at Team Rezacore to Charly Siaba!
In this video you will witness the pure talents of a professional guitarist, his voice, and an unfiltered or un-EQ 'd tonality using the Rezacore with his acoustic in this studio setting!
Trumpet Series
Starting at $179.00 plus taxes
and shipping
Rezacore's Trumpet Series is specifically designed for parlor or classical body styles. The Trumpet Series will bring clarity of sound by reducing the frequency cancellation and giving the guitar a fuller more dramatic sound and feel!
Professional Series
Starting at $189.00 plus taxes
and shipping
Rezacore's Professional Series is designed for mini and small bodied acoustic guitars. This series of Rezacore is fully adjustable with the soundboard extension dial. This dial brings the sound to the player while increasing sustain, resonance, harmonics and clarity of sound!
Professional Series II
Starting at $229.00 plus taxes
and shipping
Rezacore's Combination Professional II Series brings the best of both worlds by incorporating the Trumpet and the extended soundboard dial. This creates the ultimate in sound control and sound dynamics. Increased resonance, sustain, harmonics and clarity of sound!
Rezacore Products
My mission as an innovator, is to honor the bond between you and your instrument by creating the world’s first organic in‑sound‑hole enhancer that lets your acoustic or classical guitar sing with its truest, most expressive voice.
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Darren Rothecker / Inventor