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Adjustable sound ports?

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Tim McKnight

Post subject:

Posted: Wed Sep 26, 2007 12:05 am

Contributing Member

Joined: Tue Jan 04, 2005 1:43 am
Posts: 1529
Location: Morral, OH

Does anyone have any pictures of or links to adjustable sound ports? I am thinking that Linda Manzer had a sliding door on one of her designs but I can't find any pics of it. There may be others so I would appreciate any help that you can share.
Thanks...

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grumpy

Post subject:

Posted: Wed Sep 26, 2007 12:53 am

Koa

Joined: Wed Aug 22, 2007 11:58 am
Posts: 1667

Search for 'blue guitar collection' or something similar.

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Brock Poling

Post subject:

Posted: Wed Sep 26, 2007 12:57 am

Old Growth Brazilian Rosewood

Joined: Mon Dec 27, 2004 1:20 pm
Posts: 5915
Location: United States

If you find the answer to this question... can you post it or shoot me the solution too. I have been thinking about something similar.

I "think" Linda must be using some kind of drawer slide guides on the insides, but I don't know that for sure. I also seem to recall seeing a Monteleone with adjustable ports.

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Josh H

Post subject:

Posted: Wed Sep 26, 2007 1:02 am

Koa

Joined: Tue Jan 18, 2005 11:36 am
Posts: 1595
State: ON
Country: Canada
Status: Professional

Tim,

Yes, Linda Manzer has (or had at one point) a sliding door design and so does Grit Laskin. I heard Grit give a little lecture earlier this year and if I remember correctly (don't hold me to this) he said that he no longer does the door because it is to much work and the guitar always sounds better with the port open. Grit has a picture of his first sliding door port in his book A guitar makers Canvas. The picture in the book is a bit blurry but it looks something like this.

If you have more questions about this design it wouldn't hurt to contact Grit. I have emailed him a couple times with different questions and he has been very helpful with his information. I don't really know how the mechanism for the sliding ports is designed but I think I remember reading that the design for these ports involved leather.

Hope that is of some help to you.

Josh

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Ricardo

Post subject:

Posted: Wed Sep 26, 2007 1:16 am

Koa

Joined: Wed Apr 18, 2007 6:46 am
Posts: 1012
Location: Issaquah, Washington USA

How about putting a round adjustable air deflector used in the dash of a car? Just joking.

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Michael Dale Payne

Post subject:

Posted: Wed Sep 26, 2007 1:47 am

Old Growth Brazilian

Joined: Tue Dec 28, 2004 1:56 am
Posts: 10707
Location: United States

I would have reservations about doing this. It would seem to me to lend its self to inducing a rattle unless there was some way to increase tension on the gate or lock down the gate some way.

It seems to me the benefit vs the headaches just not really worth it.

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grumpy

Post subject:

Posted: Wed Sep 26, 2007 2:02 am

Koa

Joined: Wed Aug 22, 2007 11:58 am
Posts: 1667

it is to much work and the guitar always sounds better with the port open

On my first port a few years back, I suggested to the owner that we make a door, to adjust or close the hole if he wished to. He answered back that it would always be open, and he, too was worried abotu introducing something that could rattle. I'd not made a ported guitar at tha point, but he owned 2 already, and he knew it would never be closed. Good call <bg>

I still think a tambour type door would be cool(I believe that's what Linda did), but, not for any practical reason.

I've been messing around with baffles and the like, leading to the port, and that is very interesting: it's like having a 20 slider EQ. The car-vent type thing is not as crazy as it seems....

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Josh H

Post subject:

Posted: Wed Sep 26, 2007 2:46 am

Koa

Joined: Tue Jan 18, 2005 11:36 am
Posts: 1595
State: ON
Country: Canada
Status: Professional

I just remembered seeing this guitar go through the 12 Fret website a year or so ago. Take a look at the tuned side port Here

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Josh H

Post subject:

Posted: Wed Sep 26, 2007 2:47 am

Koa

Joined: Tue Jan 18, 2005 11:36 am
Posts: 1595
State: ON
Country: Canada
Status: Professional

I don't know how the tuned port works or what its advantages are. But it is interesting...

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Don Williams

Post subject:

Posted: Wed Sep 26, 2007 2:51 am

Contributing Member

Joined: Mon Dec 27, 2004 11:25 pm
Posts: 7202
Location: United States

Wood veneers over a sheet of flexible magnet, with a metal plate inside. You can just pop it off and move it around as you want.
Or, wood veneers over sheet metal, and strong magnets epoxied on the inside.

Piece O' cake.

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Kristopher10

Post subject:

Posted: Wed Sep 26, 2007 2:56 am

Mahogany

Joined: Tue Jul 26, 2005 1:06 pm
Posts: 82
Location: Germany
First name: Kris
Last Name: Barnett

I have been thinking about this too for some reason... I was thinking about using an iris-like contraption (like a camera shutter). How??? I have no idea. Just a thought.

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LuthierSupplier

Post subject:

Posted: Wed Sep 26, 2007 4:30 am

Koa

Joined: Sat Jun 24, 2006 12:41 pm
Posts: 975
Location: United States
First name: Tracy
Last Name: Leveque
City: Denver
State: CO
Country: USA
Focus: Build
Status: Amateur

I know Kent Everett does a really cool door on his soundports using swivel arms with springs to keep it from rattling around. I'll see if I can find a pic. But you might want to contact him directly and ask.
Tracy

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Kent Chasson

Post subject:

Posted: Wed Sep 26, 2007 4:37 am

Koa

Joined: Fri Mar 23, 2007 9:56 am
Posts: 1271

I believe Linda Manzer at HGF seminar this year also said she no longer uses the door because it always stayed open.

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rlabbe

Post subject:

Posted: Wed Sep 26, 2007 6:12 am

Cocobolo

Joined: Fri Jan 07, 2005 3:46 pm
Posts: 372
Location: Golden, Colorado
First name: Roger
Last Name: Labbe

I talked to Linda about it when she exhibited at the Blue Guitar show at the Smithsonian. Her implementation was slick, but she told me that it was a lot of work to no real purpose.

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RWGoodman

Post subject:

Posted: Wed Sep 26, 2007 6:18 am

Walnut

Joined: Sun Sep 02, 2007 11:41 am
Posts: 30
Location: Canada

The ergo guitar from Charles fox has a sliding door option.

http://www.ergoguitars.com/

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Allen McFarlen

Post subject:

Posted: Wed Sep 26, 2007 7:16 am

Cocobolo

Joined: Fri Dec 01, 2006 6:44 pm
Posts: 471
Location: Australia
First name: Allen
Last Name: McFarlen
City: Mt. Sheridan
State: Qld.
Zip/Postal Code: 4868
Country: Australia
Focus: Build
Status: Professional

Here is a link to a picture of the sound port that Linda builds.

http://www.manzer.com/web/index.php?thisid=176

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Barron River Guitars & Ukuleles
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TonyKarol

Post subject:

Posted: Wed Sep 26, 2007 9:06 am

Contributing Member

Joined: Fri Sep 09, 2005 7:51 am
Posts: 3786
Location: Canada

Linda's door slid in a curved, L shaped bracket glued to the inside of the side area, one on either edge of the door itself (make the door a long rectangle curved the same as the side). It (the ledge) was lined with leather to stop rattle, and to be a bit snug to be able to set the door at a certain opening size.

Grit only did a few that way, and then stopped, because no one ever closed it !!! Waste of time.

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