#### Hollywood Jim

##### Platinum Member

I understand the need for standard drum diameters. So that standard sized drum heads can be manufactured and sold. But why are drums made in standard depths?

It seems that if a drum were designed for optimum tone, sound projection and tuning ability, the depth of the drums would not be in standard sizes.

I can imagine it would be difficult to market tom sizes such as 12 x 8.75 or 13 x 9.64, etc.. However, if it was discovered that the optimum depth for a 12 inch diameter maple shell at 7.5 mm thickness was 8.75 inches, then that could become the accepted normal depth.

So my question is why are drums, in particular rack toms, made in standard depths of 8, 9, 10, 11 and so on?

Has someone experimented to find out how different drum depths affect the sound and the ability to tune the drum?

And did they find that the optimum depths turned out to be exactly 8, 9, 10, 11 inches?

( Andy, please pick up the white courtesy phone! )

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