JOHN OLIVER


composer

Guitars and accessories for sale

Professional

A lighter touch, suitable for all styles but especially good for classical and baroque music.
European spruce top; American rosewood back and sides.
Comes with reinforced soft case.
Email for pricing.
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DETAILS
-Year: 2014
-Number: #061
-Model: Professional
-Wood -- top: Germany Bavaria Spruce
-Wood -- back and sides: Higuerilla (Micandra spruceana), from Peru
-Wood -- Neck material: Cedro
-Wood -- Fretboard wood: Ebony
-String Scale in mm (measured from nut to saddle): 650 mm
-Width of Fingerboard at nut in mm: 53 mm with string gage 42.5mm
-Width of string hole gage at bridge from 1st string to 6th string in mm: 57.5 mm
-Finish: French Shellac Polish
-Set up: (measure the gap between the top 12th fret and bottom of
-string in mm) on the 6th and 1st strings: 3.6 on the 6th /3.2 mm on the 1st
-Issues that would need to be disclosed: new
-State of the finish :new
-Layout of top & body construction: Toress/Hauser I style 9 pieces bracing bar with dynamic balance, fully reflection sound wave cabinet. Fully hand made without machinery work for cabinet construction.
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Maestro

SOLD!

A very resonant big sounding guitar, especially good for romantic to contemporary classical guitar repertoire.
Swiss Alpine spruce top; Cocobolo back and sides.
Comes with hard-shell case.
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DETAILS
-Year: 2011
-Number: #009
-Model: Maestro
-Wood -- top: Swiss Alpine Spruce
-Wood -- back and sides: Cocobolo
-Wood -- Neck material: Cedro
-Wood -- Fretboard wood: Ebony
-String Scale in mm (measured from nut to saddle): 650 mm
-Width of Fingerboard at nut in mm: 53 mm with string gage 42.5mm
-Width of string hole gage at bridge from 1st string to 6th string in mm: 57.5 mm
-Finish: French Shellac Polish
-Set up: (measure the gap between the top 12th fret and bottom of
string in mm) on the 6th and 1st strings: 3.6 on the 6th /3.0 mm on the 1st.
-Issues that would need to be disclosed: demo guitar
-State of the finish: with nail marks on right side area of top hole
-Layout of top & body construction: Toress/Hauser I style 9 pieces bracing bar with dynamic balance, fully reflection sound wave cabinet. Fully hand made without machinery work for cabinet construction.
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Design Concept

Principle: engineering acoustics is a top priority.

1)Top & side/back---Premium thickness of sounding board and side/back which are much thicker than traditional thin top construction, with dome-shaped top and back to create proper compression and tensile strength. This makes for excellent sound and easy playability. (Traditional thin construction guitar is short of tensile strength.)

Dynamic balanced design of bracing pattern system, static balance design for resonance construction.

2)--side and back-- major projecting construction (back) is designed with a construction of reflection coupled with resonance, for example, 70% reflection while 30% resonance for high tension master guitar, the rate between reflection and resonance will depend on user`s request. An excellent master guitar should be made with powerful reflection to deliver every music note all over the concert hall.

3)---Cabinet and neck: According to Ohm`s Law—Piezoelectricity theory with a construction of no energy loss but full-energy cycle.

4)---Premium cabinet air volume construction ----according to different acoustic conditions of every set top and back/side material to decide the proper cabinet air volume guitar to guitar. A proper loading of air volume against string and cabinet construction will ensure the sounding board system with effective and stable vibration.

5)— Pay attention to both sides (backward and forward) effective vibration of sounding board.

A traditional thin thickness construction guitar only pays attention to backward vibration and always unable to initiate a forward vibration of sounding board owing to too weak stress cabinet construction layout. Meanwhile a correct phase reverse timing arrangement (proper taping rate of cabinet side thickness from low bout to high bout) will ensure both sides sound wave project out simultaneously for clear and powerful sound.

6)--- Use loudspeaker design idea of under-hung voice coil stroke to set up a premium tension cabinet to keep from an over stroke (over-hung) of sounding board vibration from a weak tension cabinet lead to a confused sound performance.

7)Apply prestressed construction idea for carpentry work, in order to build up a less construction mass with strong internal stress for excellent sound and long-term stability and easy playability.

8) – only hand tools used, no machinery for cabinet carpentry work (include binding slot cut) to protect original sounding pipes of tonewood without destruction. Any wood machinery of planner / sander with either steel gear wheel or rubber roller flattens certainly all fiber pipes within tonewood.

Roger Yang luthier biography

Roger Yang is a self-taught luthier, who has been building concert classical guitars since 2007. Prior to that he was in the import-export business of fine woods for more than 20 years. As part of that business he began importing fine Spanish guitars, including a Ramirez Centenario guitar. His business took him to Vietnam, and finding an abundance of suitable woods for guitar building there, with two friends in 1990 he set up a guitar factory (Emotion Instrument company, which is now the “Ayers” brand). He was put in charge of technical development and international marketing, and attended major instrument fairs (USA / Germany / Japan). These experiences brought him into contact with many of leading luthiers in the world, and taught him the fine points of material selection and guitar making. A long time audio-file, Yang brings a profound knowledge of loud-speaker design into his guitar making. His knowledge and understanding of acoustics has paid big dividends. His guitars are beginning to win international prizes at the 2014 (August) Taiwan International Guitar Festival and Competition as well as at 2014 (October) Germany Berlin Guitar Festival and Competition.