Room ratios

How to use REW, What is a Bass Trap, a diffuser, the speed of sound, etc.

Moderators: Aaronw, sharward

Colorblind
Posts: 35
Joined: Sat Feb 04, 2006 7:46 am
Location: Hamilton, ON, Canada

Room ratios

Post by Colorblind »

Hey all,

I'm in the process of designing my control room using one of the ratios suggested in Rod's book (1:1.40:1.90). Since I'll be building from scratch, I was considering splaying the E and W walls to help control flutter echo. Would this defeat the purpose of the suggested room ratios altogether? Thanks,

Colorblind
AVare
Confused, but not senile yet
Posts: 2336
Joined: Thu Feb 05, 2004 1:56 pm
Location: Hanilton, Ontario, Canada

Post by AVare »

Room ratios affect the frequencies of room modes, which occurr in any shaped room. Splaying the walls will not reduce the effectiveness of good room ratio selection.

Good luck!
Andre
Colorblind
Posts: 35
Joined: Sat Feb 04, 2006 7:46 am
Location: Hamilton, ON, Canada

Post by Colorblind »

Great. Thanks!
knightfly
Senior Member
Posts: 6976
Joined: Sun Mar 16, 2003 11:11 am
Location: West Coast, USA

Post by knightfly »

In order to maintain the modal distribution inherent in such "golden" ratios, I would make the AVERAGE length width and height of your room conform to the ratios;

For example, (keeping it simple) if your room were to be 10 x 14 x 19 feet it would meet the ratios you mentioned; if you were to splay opposing walls by approx. 6 degrees you would have close to 1 foot in 10 splay; so I would take that 1.9 feet ( 10% of 19 feet) per side and make one end of the room 11 or 12" UNDER 14 feet wide and the other end of the room 11 or 12" OVER 14 feet wide. This would make your room 19 feet long, 10 feet high and 13 feet wide at the narrow end, 15 feet wide at the wide end.

Don't forget the ceiling; since you can't slope the floor very well, you'll need to make your ceiling slope 2 feet in 10, putting the low end over your mix position and the high end behind you. This would make your room height just under 2 feet LOWER than the nominal 10 feet at the mix position end, and that much TALLER than nominal 10 feet at the rear.

You would probably still get some flutter between the parallel front and rear walls, but these will likely be pretty well absorbed (along with corners) to control bass anyway, so that will also kill any flutter component... Steve
Soooo, when a Musician dies, do they hear the white noise at the end of the tunnel??!? Hmmmm...
Colorblind
Posts: 35
Joined: Sat Feb 04, 2006 7:46 am
Location: Hamilton, ON, Canada

Post by Colorblind »

Right on, thanks for the help! :)

Colorblind
Post Reply