batsbrew


why can't you build a false wall, at 45 degrees, or even 30 degrees, across a couple of corners, to deal with nulls?


i mean, i'm asking because i don't know.


why wouldn't this work, assuming it's well constructed drywall, floor to ceiling, with even some little tricks in there (staggered studs, or maybe some vinyl sound barrier, etc.....?

It's a very good question and or suggestion.

In practice you'd probably find that you have just moved the lower frequency nulls up or down the spectrum.

Non parallel walls will be most effective at diffusing wavelengths that are short enough to complete a cycle before reflecting.

The results of the diffusion can make a room sound lively yet smooth... and that is most often considered a good thing.

This will not do too much to help with lower frequency problems.

Some might say that parallel walls offer a better opportunity to predict, plan for, and manage specific problem frequencies.

Non parallel walls in a small room may create more flutter in the low end response while adding some benefits to the character of the mid and hi frequency response.





I think this is a good idea with larger rooms and in fact it is a strategy I hope to employ in my newly remodeled mix room as I slowly come to terms with what it sounds like.



all the best,
mike

ULTRABRA


diagram of both rooms can be seen here.  

Where do the doors lead? You could try just opening them up and you have expanded the room. Most certainly the null point will move once this happens.

batsbrew


why can't you build a false wall, at 45 degrees, or even 30 degrees, across a couple of corners, to deal with nulls?
 

Look at the room dimensions. False walls in a room of 8 x 7 feet and already with 5 inch rockwool here and there??? !!!  And the room needs a doorway, too. It would be nice to have a table to work at, too :o/
And room for a chair and a mic stand, maybe.

Perhaps the table surface can be *non-parallel* to the ceiling and floor?

Some people do indeed put risers on the back legs of their desks to angle them downward and reduce desk reflections. One guy posted photos on GS of his desk that he'd covered completely in OC703! That's getting a little anal, I think.

Non-parallel boundaries do not prevent resonant peaks and nulls, unfortunately. They do help mitigate flutter echoes, but that's all. And I wouldn't want to give up even a few inches out of an 8' space, as it's probably already pretty crowded in there. Especially when the horn section shows up.

There are really only two things you can do to mitigate low frequency modes: try to dampen/widen them with absorbers or build resonant bass traps. OK, there's a third option: knock down a wall and buy something really nice for the wife so you don't get kicked out of the house.

From an acoustics point of view it is the worst shape imaginable. A cube of nearly the same dimensions and way too small as well. You just need to get out of there and set up somewhere else. No amount of treatment is really going to solve your problem. And even if you could treat it, the treatment is going to impose on the room dimensions as Dave correctly points out and you don't have a lot of space to give away. Having a severe null at 80Hz is very undesirable. 

Especially when the horn section shows up.

Bit

Thanks mate, I just spat my first coffee of the day everywhere.