What makes a Double bass good for Jazz or Classical?

[Sercan Say]

Originally Posted by Ken Smith

Would you mind telling us ALL the dimensions and not just the 5/4 size so we can see what you are referring to. To this day, I still don't know what people are calling 4/4 or 5/4. Most of the people I talk with call them all 7/8ths as a true 4/4, so they say, would be too big to play for the average person.

I have all the dimensions now

Body height : 120 cm
Upper bout width: 53 cm
Middle bout width: 42 cm
Lower bout width: 76,6 cm
Neck length : 45 cm

Playing string length: 103 cm

I forgot the measur Rib depth but I'll do it today.


We have this problem with F#, when hit F# volume changes, and note is out off tune.We don't know what the problem is we changed sound post, strings, fingerboard , scale length.Maybe problem is about body dimensions?
I took a video when I hit F# you can hear our problem other note seems okay.
http://www.4shared.com/file/16463200.../SANY0314.html

[Ken McKay]

You have a resonance that is close to F# on your bass body that is very "easily" excited. You may be able to locate it and damp or change the frequency so it doesn't boom. I would start by having someone else help you find the resonating part by pressing in different places while you play the F#. If you find it by pressing on the top, then you can add some mass to that area in the form of sticky tac, plasticine or some other heavy clay type stuff. Once you get the right weight in the right place you can take the top off and glue in some wood inside and that damp it or shift the resonanct frequency of that mode of vibration. There is also a relationship between adding mass and removing stiffness. So that would be another possible approach. If you can't find the resonance by pressing on the bass body, then it is an air resonance and you can test that by taping over one, some or both ff holes.

[Sercan Say]

Originally Posted by Ken McKay

then it is an air resonance and you can test that by taping over one, some or both ff holes.

We'll look about the body, but yesterday we closed one F hole with hand and for a second we lost that sound, we'll check the body for resonance but if it is air resonance what can we do about that?

[Ken Smith]

Originally Posted by Sercan Say

I have all the dimensions now

Body height : 120 cm
Upper bout width: 53 cm
Middle bout width: 42 cm
Lower bout width: 76,6 cm
Neck length : 45 cm

Playing string length: 103 cm

I forgot the measur Rib depth but I'll do it today.


We have this problem with F#, when hit F# volume changes, and note is out off tune.We don't know what the problem is we changed sound post, strings, fingerboard , scale length.Maybe problem is about body dimensions?
I took a video when I hit F# you can hear our problem other note seems okay.
http://www.4shared.com/file/16463200.../SANY0314.html

Body height : 47 1/4" (120 cm)...Comments: 4/4 size
Upper bout width: 20 7/8" (53 cm)...Comments: 7/8 size
Middle bout width: 16 1/2" (42 cm)...Comments: 7/8 - 4/4 size
Lower bout width: 30 3/16" (76,6 cm)...Comments: 4/4 size
Neck length : 17 3/4" (45 cm)...Comments: "not a necessary measurement"

Playing string length: 40 1/5" (103 cm)...Comments: 5/8 - 3/4 size

This is a very unusual Bass measurement wise if the numbers are correct!

A long body with a wide lower bout and a short string length. I would assume this bass to have a potentially deep sound as the lower bout seems so big in length and width but the shorter upper bout may be fighting the tone making it sound thinner. The center bout also seems to be on the wide side as well.

I would like to hear Arnold's opinions on this but before that happens I would ask that you measure once more to confirm the numbers as well as my inch conversions.

[Sercan Say]

Inch conversions and measurements are correct, my luthier said he ordered the body woods pre-shaped from Romania (If I remember correct).

The bass has really huge sound with bow but we cant say that for pizz. sound.And we still have this F# problem it is between F and G notes maybe this problem is about fingerboard dressing?

[Ken McKay]

Now that I hear that again I think you need to dress your fingerboard first before you do any thing with the bass body.

You have a buzz on the E and A string, at least that is what I think I am hearing. Try finding where the string is buzzing. Jeff Bollbach's trick is to put some chalk on the bottom of the string and then retune to pitch and play. The chalk will rub off on the fingerboard and show the spot to scrape.

It sounds like the buzzing is in the area of the first position. My approach would be to remove the E by loosening it and moving it off to the side. Scrape the fingerboard under the E from where the nut butts against the fingerboard up to about F or maybe F#. Put back on the string and listen for improvement. Repeat as necessary. Once good, do this with the A string.

If this doesn't help, you will need to pop off the nut and plane the fingerboard down with a handplane. Start from about A on E string and plane towards the nut end.