Search found 13 matches

by JurgenV
Fri Jul 12, 2019 7:50 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: opinion about my frequency spectra
Replies: 10
Views: 589

Re: opinion about my frequency spectra

Hi Trevor, I fear I might get annoying but I´m a bit confused so I need to ask to get the spectrum interpretation the next time right: You write that when you talk about characteristic frequencies T(1,1)1, T(1,1)2 and T(1,1)3 you mean the fully coupled frequencies. So I have to look at the unplugged...
by JurgenV
Fri Jul 12, 2019 3:23 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: opinion about my frequency spectra
Replies: 10
Views: 589

Re: opinion about my frequency spectra

Ok, finally back form work. If Trevor always refers to the fully coupled frequencies the numbers actually are no longer as good... the unplugged spectrum with the peak positions: top_va_spec_pos.JPG In this case I´m not only a few Hz too low. 162.5Hz for T(1,1)2 and 215Hz for T(1,1)3 doesn´t sound s...
by JurgenV
Thu Jul 11, 2019 8:41 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: opinion about my frequency spectra
Replies: 10
Views: 589

Re: opinion about my frequency spectra

Cladni testing could be a possibility but I have already given the guitar back to its owner :)
In addition I would have to start putting the equipment together as I didn´t start into this direction
by JurgenV
Thu Jul 11, 2019 4:51 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: opinion about my frequency spectra
Replies: 10
Views: 589

Re: opinion about my frequency spectra

Hmm, but that means I aleady have a T(1,1)3 with 214Hz as this is the peak which vanishes from the spectrum when the soundhole is plugged. So I have to raise the top frequency? Ok, I will check the peak positions of the unplugged spectrum as soon as I´m back form work and post the values. The top an...
by JurgenV
Thu Jul 11, 2019 5:56 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Excel spreadsheet and summary page
Replies: 2
Views: 410

Re: Excel spreadsheet and summary page

Hi Dave, I saw that you didn´t get an answer. I can give just give you my opinion: Actually I´m quite new to the books of Trevor and Gerard but I never heard about a simple summary. The thing is that you have to work through the math. You don´t have to understand all derivations for the different fo...
by JurgenV
Thu Jul 11, 2019 2:55 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: opinion about my frequency spectra
Replies: 10
Views: 589

Re: opinion about my frequency spectra

Hey Trevor, thanks a lot for the confirmation of my data. It does sound nice, but that doesn´t mean there´s nor space for improvement :) As I wanted to use this guitar as a test object I can try to aim for a back frequency you suggested. Btw. just to be sure: when you talk about the target frequenci...
by JurgenV
Tue Jul 09, 2019 4:38 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: opinion about my frequency spectra
Replies: 10
Views: 589

opinion about my frequency spectra

Hi, it´s me again. I finally got my old guitar back from it´s new owner to do some frequency analysis and to check the values for the specific mobility. This was my second steel string build where everyone had been totally surprised when they heard I built it myself. And I never came near the sound ...
by JurgenV
Tue Jul 02, 2019 4:27 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Flexural rigidity & Co
Replies: 3
Views: 537

Re: Flexural rigidity & Co

Thanks for your comments Trevor. This helps to get further. Concerning the braces with and without carbon fibre... yeah, I should have checked that first instead of just guesssing. According to my spreadsheet it´s around 0.6mm I would have to remove. With the MOR would guess one needs a good statist...
by JurgenV
Tue Jun 25, 2019 5:34 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Flexural rigidity & Co
Replies: 3
Views: 537

Flexural rigidity & Co

Hi. I´ve got a question concerning flexural rigidity for falcate steel strings and classical. But first quite a long text to show that I most probably managed to get my spreadsheets working After a quite long break due to my job I continued work through the Book to start with the excel sheets for ta...
by JurgenV
Tue Feb 05, 2019 7:41 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: reproducibility... or copy... of early build
Replies: 1
Views: 588

reproducibility... or copy... of early build

Hi, I need some advice: When I started building guitars, a few years ago, I somehow managed to build a really nice sounding guitar. Spruce top, maple back and sides, walnut binding. At that time I didn´t write down any dimensions, I just used the OOO plans from stewmac and added a scoop cutaway. Eve...
by JurgenV
Thu Dec 20, 2018 8:09 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: uery for Trevor re Compensation Calculations
Replies: 44
Views: 20827

Re: uery for Trevor re Compensation Calculations

Sorry, somehow I kind of forgot that I read this chapter :) I was so stuck with the rest of 4.7 ... And already the obligatory spreadsheet done. Actually I was quite surprised that a variation of the scale length by 35mm didn´t change the solution for the compensation. I used the example data in tab...
by JurgenV
Thu Dec 20, 2018 7:29 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: uery for Trevor re Compensation Calculations
Replies: 44
Views: 20827

Re: uery for Trevor re Compensation Calculations

Hi Trevor, thanks for your input. Sounds promising. I´ll start with the new spreadsheet over christmas and use as reference for the neck my already existing guitars. Btw. how would you determine the nut and saddle compensation on an already finished guitar? For input we have now the intonation error...
by JurgenV
Sat Dec 15, 2018 2:55 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: uery for Trevor re Compensation Calculations
Replies: 44
Views: 20827

Reviving an older post

Hi, I´m building guitars as a hobby for some years. Actually these guitars have never been really bad but from 11 builds lets say 3 are really good sounding but I never really knew why. When I read about the "BOOK" I organized a copy in a library (actually I could find just one book in whole Germany...