Ceiling height and design

69.12.231.118

Posted on August 13, 2009 at 12:19:36

Skip Pack
Audiophile

Posts: 51
Location: Hollister, CA
Joined: November 20, 2005

I am building a listening room -- a rectangular studwalled room,
sheathed inside and out, within a metal building. My current question,
relates to the height of the ceiling, and the shape to use. The studwalls
are up and sheathed on the outside, current height is 97". The room is
13'10" X 20" inside dimension, and the there is room for a 10' ceiling with
higher peaks in some parts.

I have downloaded ModeCalc and played with dimensions. With an 8.5 foot
flat ceiling, I'm a little short on volume. I have been looking to avoid
modes from multiple dimensions occuring at the same frequencies, and I
figure it's best to avoid 60hz, and particularly 120hz just to not
make AC hum stand out. If I increase the ceiling height, the volume
improves, of course, but the modes related to the height creep down toward
60hz and multiples. What are some suggestions as to how I might best
balance these tradeoffs?

Thanks for your thoughts,

Skip Pack

RE: Ceiling height and design

Ethan Winer

12:56:17 08/13/09

RE: Ceiling height and design, posted on August 13, 2009 at 12:56:17

Ethan Winer
Manufacturer

Posts: 1554
Location: New Milford, CT USA
Joined: December 3, 2003

I would not worry even a little about whether a mode aligns with 60 Hz. If you have hum in your system you'll fix that anyway. More to the point, it's impossible to predict with anything like 1 Hz accuracy where modes will fall once the room is built. I've seen predictions be off from what's measured by as much as 20 percent. The math is correct! But the math applies only to a concrete bunker, and different materials can shift the frequencies. So I suggest you aim for a high ceiling with plenty of volume, and avoid obvious frequency overlaps such as 10 by 20 feet etc.

--Ethan

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Ceiling height and design

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