[EduardoApolonia]

Originally Posted by x99

Hey Eduardo,

Are all these measurements with the same speakers? ie the Adams.

Most of these readings were made with the Barefoots, although there are readings done with the Adams S3X-H and S4X-H and probably with my old S3-As

Originally Posted by x99

Any reason for ditching the Barefoots?

It could be from the interaction with my room but I don't like the way the Barefoots sound in the mid lows (kind of compressed) and on the lows (too soft/slow), mids and highs sound very good to me.

Originally Posted by elmolemon

Wow, you're right! This IS is a monstrous basstrap!
But why are treating the backwall this intensive? If i remember right you mentioned somewhere in this thread, that there were problems with the distance of the speakers to the back-/sidewalls and the ceiling.
Maybe you should try to add treatment there or try to go for tuned acoustic treatment to kill this dip.
I was really sorry to read that you're having problems with your acoustics, as i really loved seeing this studio-build progress.

Although having almost sure that SBIR (Speaker Boundary Interferense Response) was the biggest problem here Martin Pilchner suggested I did this monstrous basstrap mock up to check if there was any tendency or not to help with the problem, so that we could move on being sure that the problem wasn't in the back.
Also, some of my earlier posts can contain conclusions of tests which I'm only posting now info of.

Originally Posted by judah

Exactly what I was thinking. You mentioned that SBIR seemed to be the main problem with your 100andsomething dip.

See my answer above for answer about the SBIR and building the basstrap mock up

Originally Posted by judah

If I were you I'd try and built a front wall instead of the huge bass traps and flush mount the monitors. Expensive? Yeah, but you look very focused on sorting this issue out so...

Good luck.

I'm already working on it (at least in paper)

Originally Posted by Andre Toscano

Thanks for the kind words, Eduardo.
Always glad to help.

Best regards and good luck with the studio construction.

Andre' Toscano
Audiolog, Lda

I'm the one who thanks you!!

Originally Posted by 0bazooka_joe0

I know you'll probably overlook what I'm saying purely based on my post level and I know I am not an acoustic engineer in anyway but I've been told by a very reliable source (an unnamed studio contractor) that when working with batt insulation it is best not to cram it into whatever container/cavity you are using. It is best to put it in "gently" as if you were putting it in your walls. if you smush up your insulation then it cant do its job properly... which to my understanding is to convert sound energy into heat energy. Anyway... food for thought, i really hope you can resolve your nasty dip.

Thanks for the info. thumbsup
For what I've read, and I don't mean in anyway to contradict your reliable source that has a lot more knowledge than me on this, but I think that if the batt insulation is too loose it won't be very effective because of sound waves passing through airspace.
Also, I don't know, but maybe compressing the batt insulation will increase the insulation average density, just a quick thought I'm doing about it.
I'm also not sure but I think that the different densities of the rockwool panels are created by the degree of compression of the wool.

Anyway I have measurements where I had the Rockwool panels on the basstrap, then did different measurements:
cavity completely filled with batt insulation,
filled in the corner,
half filled
empty
the differences were small in terms of the dip, but would help (a little) in controlling the energy inside the room.


Thanks to all who are participating with ideas, all of them are very welcome.

I'll post more info shortly because I'm already more ahead of what I posted earlier...