John Sayers' Recording Studio Design Forum Archive

Hi,

A quick question for the slat trap experts.

I'm about to build a slight adaption of the usual 703/705 fibreglass bass corner trap, as suggested by Arthur Noxon (head of ASC acoustics company) in his Nov 1991 article for dB magazine. Basically its the same as Ethan Winer's corner trap idea with the addition of the 'slat-trap' concept on the face to effectively back-scatter mids and highs (this is very important to me given that my room is already a little overdamped in the top end due to plush furnishings). My questions is: Does anyone know of any scientifically valid way of calculating the width of the slat gaps as well as the distance between each of the slat gaps ?? If the gaps are too small the trap will begin reflecting bass and if they are too large the trap will become a broadband absorber (I definitely do not want this).

Thanks,

SB

This should help -

http://www.johnlsayers.com/phpBB2/viewtopic.php?t=1363

This is one of the few such calculators on the web that doesn't have an error in the formula - for a corner trap, we use the average depth -

For what you want, I'd shoot for a Fo that's fairly low (say around 200 hZ or so) Steve

Thanks knightfly,

Actually I have already played around with the SAE formula. I didn't know there was an error in it but I did wonder about the validity of the formula as the figures seemed quite screwy to me.

Cheers,

SB