Author Topic: Room size and Bass  (Read 2262 times)

Offline rollo

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Room size and Bass
« on: February 22, 2018, 11:26:45 AM »
    So one installs a pair of subs that go down to 20HZ flat in a room say 12x20 or less. Can the subs fully develop the 20 HZ signal ? Some have stated one requires a 40ft room.
Are we wasting our time and money trying to achieve true 20HZ bass in small rooms ?


charles
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Offline dBe

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Re: Room size and Bass
« Reply #1 on: February 23, 2018, 07:49:24 PM »
Yo, Bro'.  Go here if you can run old Excel (2000) programs:

http://audio.claub.net/software/jbabgy/BDBS.html

The software developed by Jeff, Paul, Thorsten, et al and the bunch back in the day is still the best modeling software available for zero outlay.

Bottom line is, yeah.  You will have a bunch Of 20Hz as well as additional low bass below the critical dimensions of the room.

Offline richidoo

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Re: Room size and Bass
« Reply #2 on: February 23, 2018, 08:45:34 PM »
Can the subs fully develop the 20 HZ signal ?

Yes. Car stereos can have nice clean low bass.

Actually there are advantages to using a smaller room...
Modes are raised higher in frequency in room with smaller dimensions, making them easier to damp.
Cabin gain boosts low frequencies in reverse proportion to room volume - requiring smaller bass drivers and less amplifier power to achieve flat FR and high SPL.

and disadvantages too of course,
Too large (passive xo) woofers in too small room will over power the room, and nothing you can do about it.

The important thing is to size the woofers to complement the size of the room and your desired FR.
Or you can use EQ or active xo to fine tune the bass response to the room volume.

If you were an ant inside the subwoofer would you hear any sound? The internal dimensions are much smaller than any wavelength the sub plays. Of course you'd hear it all, for a short time until you went deaf.