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Trevor Gore video interview
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=49346		 Page 1 of 1
Author:  Robbie O'Brien [ Thu May 11, 2017 8:55 am ]
Post subject:  Trevor Gore video interview
Recently I sat down with Australian luthier, Trevor Gore, and asked a few questions.
In this video we discuss volume, thickness of sides, how sound waves work in a guitar, classical vs. flamenco, Chladni patterns, nodes, etc.
Here is the result of that interview. Enjoy!
Author:  meddlingfool [ Thu May 11, 2017 11:13 am ]
Post subject:  Re: Trevor Gore video interview
Cool!
Author:  Terence Kennedy [ Thu May 11, 2017 12:51 pm ]
Post subject:  Re: Trevor Gore video interview
Thanks Robbie. I am a big fan of laminated sides.

What does Trevor think the mechanism behind improvement in sound by thinning the edges of the lower bout is?
Author:  ernie [ Thu May 11, 2017 3:39 pm ]
Post subject:  Re: Trevor Gore video interview
tnx robbie . for posting, It is much appreciated .I/ve been using laminated sides for 8 yrs.If you plan to have trev /s the shed in denver. Let us know , would love to attend Thanks
Author:  WilbPorter [ Thu May 11, 2017 4:50 pm ]
Post subject:  Re: Trevor Gore video interview
I really enjoyed this informative interview/discussion. Thanks.
Author:  Coach71 [ Thu May 11, 2017 5:43 pm ]
Post subject:  Re: Trevor Gore video interview
I find I build with much thinner backs than recommanded by Mr. Gore, in the range of .070" for Rosewoods. But still find the top and back 3 semi tones apart rather than 4. On the frequency scale at 170 top vs 205 back. Any benefit to that I'm wondering.
Author:  mqbernardo [ Thu May 11, 2017 5:45 pm ]
Post subject:  Re: Trevor Gore video interview
Thanks Robbie, nice to watch. As a side note, it's kind of funny when you put a voice into someone you've been reading for quite some time.
Author:  Joe Beaver [ Thu May 11, 2017 10:47 pm ]
Post subject:  Re: Trevor Gore video interview
Excellent video Robie. Trevor is a very impessive fellow.
Author:  Clay S. [ Fri May 12, 2017 6:21 am ]
Post subject:  Re: Trevor Gore video interview
Thank you Trevor and Robbie,
So much good information in a less than 15 minute video!
Author:  James Orr [ Fri May 12, 2017 1:24 pm ]
Post subject:  Re: Trevor Gore video interview
Does anyone else find themselves wanting a DVD or digital release of a lecture or two??? :D
Author:  Trevor Gore [ Fri May 12, 2017 10:27 pm ]
Post subject:  Re: Trevor Gore video interview
Terence Kennedy wrote:
What does Trevor think the mechanism behind improvement in sound by thinning the edges of the lower bout is?

Thinning the edges can increase the monopole mobility. How much of an increase you see depends a lot on how you have the top braced.

Coach71 wrote:
I find I build with much thinner backs than recommanded by Mr. Gore, in the range of .070" for Rosewoods. But still find the top and back 3 semi tones apart rather than 4.

With the back thinner, its coupled frequency will be lower and you get less separation between the T(1,1)2 and T(1,1)3 peaks for a given bracing system, as you've found. The closer the two get together, and the higher the mobility of the back, the more energy is transferred from the top to the back by the various coupling mechanisms, so less of the total energy is radiated as sound. You can choose how much volume you want to trade off in search of the tone you want, and the "f" number in the thickness equation allows you to select that amount and repeatably hit your target, irrespective of the variation in the properties of the material you're using.
Author:  Coach71 [ Fri May 12, 2017 11:05 pm ]
Post subject:  Re: Trevor Gore video interview
Trevor Gore wrote:
Coach71 wrote:
I find I build with much thinner backs than recommanded by Mr. Gore, in the range of .070" for Rosewoods. But still find the top and back 3 semi tones apart rather than 4.


With the back thinner, its coupled frequency will be lower and you get less separation between the T(1,1)2 and T(1,1)3 peaks for a given bracing system, as you've found. The closer the two get together, and the higher the mobility of the back, the more energy is transferred from the top to the back by the various coupling mechanisms, so less of the total energy is radiated as sound. You can choose how much volume you want to trade off in search of the tone you want,


"the higher the mobility of the back, the more energy is transferred from the top to the back" : If I understand this correctly, it means the back is therefore more active and will add increased complexity to the tone.
Author:  Trevor Gore [ Sat May 13, 2017 12:08 am ]
Post subject:  Re: Trevor Gore video interview
Coach71 wrote:
"the higher the mobility of the back, the more energy is transferred from the top to the back" : If I understand this correctly, it means the back is therefore more active and will add increased complexity to the tone.
Correct, but at the expense of some volume. And if the back is too active, the tone suffers, too.
Author:  SteveSmith [ Sat May 13, 2017 3:32 pm ]
Post subject:  Re: Trevor Gore video interview
Trevor and Robbie, thanks for that. Very informative.
Author:  Durero [ Sun May 14, 2017 2:34 pm ]
Post subject:  Re: Trevor Gore video interview
Great video!

Really helps to have those concepts explained so patiently and in simple terms.
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