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In Reply to: RE: Baffle finish ?? posted by rogerh113 on June 18, 2017 at 06:22:42
Have you understood the resonance value of that wood based on it's thickness and proportions?
Sorry, you say you want to do this right the first time so you need to study up.
Typically MDF or something very strong and non-resonant is used unless you are building a speaker that mimics a musical instrument and you want it to resonate.
I am basically resizing an Altec Magnificent cabinet down to 9 cu ft for my Altec 604s. That is all vintage 3/4 ply, with walnut veneer, in good condition. I am adding the baffle (dado in) and a center support (dado in) from 3/4 ply (also quite vintage). So at the end of the day this is a 'standard' Altec cabinet with a baffle. Question is - after I blacken it with india ink, is there acoustic merit in lacquering the face of the baffle, or best to leave it 'raw' plywood?
I imagine the baffle people do a lot of experimentation, and if a concensus has been reached on 'finish or not finish baffle' - I would be interested in the merits / drawbacks...
regards -- Roger
There is zero, none, nada difference with regard to sound. If you put on a polyurethane or other finish which affects the stiffness of the panel, you 'might' get some measurable change, but it will be very slight.
On musical instruments, such as trumpet - with which I am very familiar, the thin metal is an essential part of the sound and resonates the way the designer wants it to. Adding lacquer and/or plating will affect the sound. But when you're talking about a (hopefully/ideally) non-resonant panel such as your speaker cabinet, the cosmetic finish is irrelevant.
As Richard Blaine said, "ask your wife".
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