Spread Resonant 

Semi-Hollowbody Guitars.

Richness of Tone Like No Other.

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The Semi-Hollowbody SR (Spread Resonance) guitars provide the sustain you would expect from a solid instrument, but with the body vibrance much like you would find in a full size Archtop - all in a thin, light (under 5.75lbs) instrument.

 

 

Body Resonance in Archtops and Semi-Hollowbodies

Grez SR Series Construction Explained

The Spread Resonance approach allows body resonances to influence the instrument sound over as wide a frequency range as possible.  This is not to imply that focused narrow band resonances are not desirable or tonally useful.  Your typical semi-hollowbody would fall into this category.  If you tap on the top, bass or treble side, you will perceive two things immediately.  First the primary note or resonance is fairly high in frequency, around 300Hz or higher and that both halves generate nearly the same note. This highly focused resonance is much of what gives a 335 its distinct sound.

 

A brief historical look at the archtop guitar will show a transition in some instruments from solid carved wood to laminated materials to lower production cost and to help control acoustic feedback in amplified situations.  To further control feedback blocking and eventually full center blocks were added creating the semi-hollowbody we are all familiar with.  But, by adding a center block, the unsupported area of both the top and back plates are significantly reduced.  The remaining plate area will be significantly stiffer, in turn resonating at a much higher frequency. 

 

These plates can be re-optimized based on their now smaller unsupported dimensions to bring back some of the liveliness and warmth (lower frequency resonance's) of the full hollow archtops. Similarly, large asymmetrys can be designed into all aspects of the body’s internal structure while keeping instruments exterior looking traditional. In doing so, a very pleasing and useful balance can be found between the loud, rich and powerful, but feed-back prone full hollowbodies and the tight but feed-back resistant sound of today’s semi-hollowbodies.

SR-16   
 
16" Semi-Hollow body 
Solid Sitka Spruce Top or Redwood 
Figured Maple Back and Sides
Honduran Mahogany Center Block and Neck
East Indian Rosewood Fretboard
25" Scale, Jumbo Frets
BG Pups Vintage P-90
TonePros AVR2 Bridge and Aluminum Tail Piece
Nitro Finish
RB Continental Case
 
As Shown $3,300

Listen to the SR-16        Video 1        Video 2        Video 3

Both the SR-15 and 16 are available in a standard and Historic variation. The Historic  uses dog ear P-90s, a trapeze tailpiece

and selector switch reminiscent of the old Gibson Switch Master.

SR-15   
 
15.25" Semi-Hollow body 
Solid Sitka Spruce Top
Figured Maple Back and Sides
Honduran Mahogany Center Block and Neck
East Indian Rosewood Fretboard
25" Scale, Jumbo Frets
BG Pups Vintage P-90
TonePros AVR2 Bridge
Bigsby 
Nitro Finish
RB Continental Case
  
As Shown $3,350

Listen to the SR-15        Video 1        Video 2  

SR-14   
 
14.25" Semi-Hollow body 
Solid Redwood Top
Honduran Mahogany Back and Sides
Honduran Mahogany Center Block and Neck
Amazon Rosewood Fretboard
25" Scale, Jumbo Frets
TV Jones Filtertron Classic Plus
TonePros AVR2 Bridge and Aluminum Tail Piece
Nitro Finish
RB Continental Case
 
As Shown $3,200

Listen to the SR-14        Video 1        

Mendocino  
 
13.25" Semi-Hollow body 1.75" Depth 
Solid Old Growth Redwood Top
1pc Honduran Mahogany
Back, Sides and Neck
Macassar Ebony Fretboard
25" Scale, Jumbo Frets
Lollar Goldfoil Pickups
TonePros AVR2 Bridge
Grez Tail Piece
Nitro Finish
RB Continental Case
 
As Shown $3,150

The Grez Mockingbird is a fully chambered lightweight guitar (5lbs) designed and built with a nod to P.A. Bigsby's approaches. When enough material has been removed from a chambered solid body and the top cap is thin enough, it's behaves like a small semi-hollow body.  Because of this, although it looks like a solid body, it has a strong acoustic voice that, when coupled with Gold Foil pickups, produce a uniquely useful and lively sound.

Listen to the Mendocino        Video 1        Video 2       Video 3

SR-16GV 
 
16" Semi-Hollow body 
Sitka Spruce Top
Figured Maple Back and Sides
Rosewood Fretboard
25" Scale, Jumbo Frets
Honduran Mahogany Neck and Center Block
TV Jones Classic Filtertrons
Top Load Tele Bridge
Nitro Finish
RB Continental Case
 
As Shown $3,350

Listen to the SR-16GV       Video 1        Video 2     

CRB-15 Bass
 
15.25" Semi-Hollowbody, 2.6" Depth 
Maple Top, Back and Sides
Ebony Fretboard
Hipshot UltraLite Tuners
30" Scale Fretless
Honduran Mahogany Neck and Center Block
TV Jones Thunder'Blade Pickups
Nitro Finish
 
As Shown $3,100
 
 

I build basses like this in a variety of sizes and depths, both hollow and semi-hollow.  Scale length, fretted or not, pickups, color and everything else is designed to your specifications.  My intention is to recreate cool vintage basses like the Harmony H22 or Howlin Wolf Bass, but with modern reliability and features.