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#1
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Last edited by Matthew Heintz; 01-08-2009 at 03:24 PM. |
#2
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![]() It shouldn't add much of anything to the price of a bench made DB. Nor will the beefier tailblock. Handmade basses are way underpriced for the time it takes to design and make a custom one. They cost about as much as bench made Cello and even some violins are 25 - 30K.
Ken, I gotta wonder about that 20% change in volume and depth of sound with one little hole plugged at the tailblock area. As far as pure acoustics, pschychoacoustics of bowed stringed instruments it should not make that much difference. OTOH I am sure you don't speak lightly about stuff like that. |
#3
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Do you believe that F-hole size matters much as far as volume and tone of a given bass? I haven't seen this discussed all that much around here or anywhere else. For the record, I do! |
#4
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![]() No I haven't noticed any correlation of F hole size to either volume or depth of sound. This is easy to test if you cover a portion of the soundhole, it either changes or not.
From what I have seen and heard, the things that do seem to matter are f-hole placement. This might be from their effect on the top plate resonances. Of course this is hard to prove. I am thinking that wider spacing effects the depth because of the flexibility of the plate goes up across the grain when spaced wider apart. This would effect depth of sound the most I think if the f holes are wider spaced. But the air inside needs to be able to reinforce the plate movement or it is wasted movement. So air volume and plate resonance needs to match. More of this can be heard as more fundamental to the tone. Holes in the side of the upper bout don't seem to effect depth or volume much. I have played Arnold's ergo and I heard him say this also. A hole in a place of maximum rigidity of the plates (tailblock) might theoretically highly effected sound. I have read that air pressure is highest there. Since the air pressure reinforces the plate vibration of both the top and back, a loss of pressure could decrease volume or depth. |
#5
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![]() My non-scientific belief is that overly large f-holes are not good for tone. I will try to explain, based on a lengthy conversation I had about a decade ago with Tom Martin. We think that when the f-holes of a bass are really big, the sound jumps out of the bass quickly, creating the illusion of power. But when the f-holes are sized right, the sound has more time to roll around inside the corpus and it gets seasoned. Then the tone is more complex and woody, but the bass may not sound quite as loud in the immediate surrounding area. However, it will spread out into the hall and the audience will get more bass sound. Now this begs the question, "what is the right size?". My answer is, I know it when I see it. I think many of the Italian and English masters had it right, i.e., Panormo, the Testores, Ruggieri, etc. Contrarily, to my eye many of the Germans, Viennese, and some of the Americans make/made their f-holes overly large and open. And I have also had experience where very small f-holes seem to be holding back the power of a bass. I had the experience of enlarging them on a fine bass once, and I thought the instrument's power improved. Then again, other modifications were made, so I can't be sure.
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#6
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![]() I always go for sound and volume before all else especially in chamber music where I am all alone and do not need to blend and my primary objective.
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#7
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![]() Italians used proprotional geometry to place the f holes, Might that have a lot to do with them looking and sounding right?
Structuraly there is a lot going on in this area. The flexiblility of the plate in this area is highly effected by the placement of the f holes and their spacing, length, width of wings, slope and area. Arching, thickness and edge scoop also highly effect the structure of the top plate in this area. The bridge sits right in the middle and transmits the string movement directly to the top, right in the middle of the f holes. Theres a lot going on here! Viols had C holes with a similar area as f holes. But the C holes covered much less horizontal grain so the plate was stiffer in that area. F holes evolved to create the more violin like sound that is now favored in larger concert halls. So that is why I think f holes effect the sound a lot but not by air movement. The air pumping out of the box through the f holes creates a fullness to the sound. And I have noticed even cheap plywood basses have that whoomph, air sound. But the complex tone from a good bass comes from resonating of the bass body. I just don't think the f hole size effects tone much by itself, unless they are too small or large. I am going to do some tests later this week. edit: By allowing or not allowing air to pump, I should have said. Last edited by Ken McKay; 01-12-2009 at 02:06 PM. |
#8
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![]() So ... can you elaborate on exactly what you believe matters?
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#9
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So, what exactly made the bass sound better? Hard to tell.. |
#10
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I agree with your last point that there are just too many variables in DB luthiery to be able to make any reliable rule of thumb. For the record, *I* don't know what the effect of changing F hole size does, as a generalization. Nor F hole placement, angle, edge shape, length, area etc. It would be nice to have a formula to work with, but I don't think there's going to be one. My own hunch is that it is not so much the size or shape of the F holes that matters for sound, so much as the size and shape of the space left between them. So it's the INSIDE edge of the FFs that is most important; the outside edge has a marginal effect. But I don't have any evidence to back that up. Arnold's observations are valuable but I don't think anyone would care to predict the outcome on a bass's sound based on those alone. |
#11
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![]() The air does come out of the holes as if it's the 'sound window'. The size of the window can be too small or to big to handle the air pressure or lack of it. What is better or worse, who knows? Softer woods might have different formulas than harder woods, etc. Placement of the Fs is another issue as far as the bass itself goes. Too exact basses with different wood might differ as well.
I am a firm believer that the wood matters. A LOT. Actually, everything matters. If there was a formula, there wouldn't be as many models around as there are now. I know a good bass when I hear it or play it. I speculate quite a bit with basses that are barely playable or totally unplayable and usually come out ok after restoration. It's the 'package' and not just one factor that makes or breaks a bass design wise. |
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