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Jazz folks: Hollow or semi hollow for live ?


musicdog400

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Partly depends on the top. A laminated top like a 330 or casino won't feed back as much as something with, say, a solid spruce top. Nugent gets away with some pretty loud stuff with a full hollow Byrdland.
A semi is a little more forgiving.
Playing at "jazz volumes," though, you should be able to get away with a full hollow pretty easily. Plus, there's The Sound of a full hollow. Tough to beat.

EG

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could you use a well placed c-clamp or something like it to add pressure to the top?

 

also, can this Different Woods thing be discussed a little further, just because i'm curious, why does a laminated top feedback less than a solid top? is it the extra weight or stiffness of the glue?

 

not sure what my artcore ak85 full hollow has for a top, i'd have assumed laminated because of the price, but it does just fine at rock bar levels.

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could you use a well placed c-clamp or something like it to add pressure to the top?

 

Yes that is essentially what I was thinking. Or a bar connected to the back that could move forward and gently press the top. In my mind I can see this going wrong and detaching the top.

 

 

why does a laminated top feedback less than a solid top

 

I imagine that a top made of layers of wood and glue vibrates a little less than a solid carved top. Many players who could afford either one prefer the laminated top for live playing and less feedback. I think the best acoustic instrument does not make the best electric instrument.

 

FWIW I spread out a bunch of wood glue (Tite Bond) on some foil and let it dry. It was not nearly as stiff as I would have expected.

 

I saw a black stained Ibanez hollow this week at GC (I think it was Artcore). It was beautiful.

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At jazz volumes it shouldn't be a problem. People have been playing solid top hollows that way for a long time. It pays to do a good sound check to find the spots where it happens and not.

As for solid vs laminated: traditional archtops (acoustic) use solid tops like spruce so they vibrate. An acoustic archtop makes noise by vibrating that top. That's why they like the heavier strings...to put enough pressure on the top to get it moving nicely.
With a pickup and the amplified volumes, the solid top is too sensitive and everything gets going together and it's too much. Feedback city.
Laminated tops, especially maple, are much stiffer because they are generaaly glued together across the grain. This hurts acoustic sound unplugged but still imparts a lot of the hollow sound but cuts down on the vibrating top.
A semi hollow takes it one step further by putting a center block under the bridge. This means the string tension is transferred to the block and the back/sides more than it is the top and cuts back on feedback even more.

EG

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And regarding the clamp business, Gretsch has a design like that. It's on the Country Gentleman maybe. It's a bar that sticks up through the top of the guitar and has a damper on it. By engaging or disengaging it, you can control the amount of vibration in the top. I always thought it looked goofy, but, I guess it works.

EG

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