How to achieve bass in a cubical-shaped room

[zobsky]

A friend's upstairs HT / listening room is unfortunately near cubical apart from being partly open to a large vaulted area on one side. No matter what we try, there seems to be some sort of bass / mid bass suckout.

What are our best options? DIY is no problem and I have a variety of drivers available.

Thanks

[Osvaldo de Banfield]

You can try putting some muckets in the floor, courtains or some other absorbent material to stop standing waves in the room. I believe that if the place where it is not acoustical, few things can you do in the audio equipment, except a parametric equalizer and attenuate all resonant frequencies in the audio program being reproduced.

[weltersys]

Originally Posted by zobsky

A friend's upstairs HT / listening room is unfortunately near cubical apart from being partly open to a large vaulted area on one side. No matter what we try, there seems to be some sort of bass / mid bass suckout.

Try covering the opening to the vaulted area with a piece of plywood, if that works a door could be installed, or a rolling divider made.

[bjorno]

Cubic room......:
Probably more than 2 subs would be a fruitful cure..

b

[kipman725]

lots of absorbtion to make the room have a less high Q resonance.

[BP1Fanatic]

bjorno, you have some GREAT audio software over there!

[bjorno]

Originally Posted by BP1Fanatic

bjorno, you have some GREAT audio software over there!

Hi, BP1Fanatic: I just picked a free tool I found to be useful for this purpose:

Room Response Calculator - Reflective Accumulation Simulation Software

b

[zobsky]

Originally Posted by bjorno

Hi, BP1Fanatic: I just picked a free tool I found to be useful for this purpose:

Room Response Calculator - Reflective Accumulation Simulation Software

b

Great, We'll be sure to check the software out.

FWIW... I've loaned my friend my T-TQWT 12" shiva sub for now (I know you're a fan of these enclosures).

[revboden]

suck-out you say. What you've got there is phase cancellation. One of the distances of the sub to one of the boundaries is 1/4 wavelength of the frequency being cancelled. Figure out what frequency is being canceled and you will be able to tell which reflection is causing it.

He's going to need careful placement and multiple subs placed at varying distances from boundaries so the suck-out one sub experiences is covered by the others.

[weltersys]

Originally Posted by revboden

suck-out you say. What you've got there is phase cancellation. One of the distances of the sub to one of the boundaries is 1/4 wavelength of the frequency being cancelled. Figure out what frequency is being canceled and you will be able to tell which reflection is causing it.

He's going to need careful placement and multiple subs placed at varying distances from boundaries so the suck-out one sub experiences is covered by the others.

Careful placement and multiple subs may be needed, unless closing the opening to the large vaulted area on one side eliminates the suckout, as it did in a studio I recently "fixed".
The difference made by simply placing a gobo in front of the opening was obvious even without any test gear, the control room smoothed in response by an order of magnitude (as confirmed by the test gear).

No speaker position changes or additions were needed.
I hardly made any money on that consultation

Art