Hi to all! After lots off reading this forum and lots off planing
i started to work on my room..
The biggest problem is that this room has square dimensions:
360 x 360 x 260 cm (11.8 x 11.8 x 8.5 Feet) so i had huge bass
problems.
I decided to built big bas traps in corners, broadband absorbers on
side walls, cloud above mix position and QRD diffusers on back wall.
For now I built two bass traps in front corners but i am afraid i used
too soft rock-wool.. its tervol dp3 10 cm (4 inch) deep (i am very limited with rock-wool products here where i live). I cut them diagonally and placed
them on top off each other and then made 120 x 80 cm frames, covered
them with microfiber fabric and placed them in corners like on pictures.
For my broadband absorbers i used 120 x 60 x 5 cm frames and put two tervol TP which is a rigid rockwool used for floors and placed them on first reflection zone on side walls.
questions:
1. should i use tervol tp for my third bass trap on back wall or i can stay
with DP3
2. what else am i missing something.
Overly room sounds much better now and i believe whan i build everything planed it should be ok. I am buying KRK VXT 8 soon so
I very interested how they will sound here.
Just to show you how i built my bass traps
Originally posted at johnlsayers.com, topic 11285.
please, i would really appreciate some feedback,
am i doing it right and should i do something different..
i know i need lots off bass trapping and
i am afraid that these corner bass traps
are not that efficient...
also is microfiber good for this?
on the picture you can see bass response
before treatments...
sorry for my bad english.
best regards
tomislav
I just made few measurements and moved speakers around.
This is the best i could get.
so, i have redesigned my table... removed the metal legs
and made new wooden 2" fat (i cant remember the right word:),
and i put some cement blocks which have hole in the middle,
they weight at least 15 kg. Now my cat have new hiding place :)
Hi Tomislav. I just wanted to comment that those bass traps look really good to me! I'm thinking of doing something like that in my studio.
And your frequency response curves look fairly decent to me, although I'm no expert on that. I guess the roll-off below 80 Hz is due to the limitations of your speakers, rather than then room itself.
Maybe one of the acoustic experts will comment on your questions, but from the size of those bass traps and your comment that the room sounds good now, I think you did just fine. I don't think that "soft" rock wool is going to be a problem, by the way: The amount you have in there is pretty large, so my guess is that it is working fine.
Studio Monitor Stands on Wooden Plank Flooring - Decoupling...and i put some cement blocks which have hole in the middle, they weight at least 15 kg. Now my cat have new hiding place :)
Its not bad, but its not enough, it still has 20 dB difference on some frequency, but there are more basstraps to be made so i believe i could get 6 dB whan i am done. I believe it would be even better with more rigid rockwool, maybe it would give me deeper bas absorption. I will use it on my other basstraps. Good luck and best regards, TomislavAnd your frequency response curves look fairly decent to me, although I'm no expert on that. I don't think that "soft" rock wool is going to be a problem, by the way: The amount you have in there is pretty large, so my guess is that it is working fine.
I like the idea but if i move my table back, my listening position will be at the center off the room which in my square room is the worst place to be. BTW. I am building one QRD diffuser next week for my back wall. Will it be effective in my room? My listening position is 9 foot from back wall. There are the calculations.Studio Monitor Stands on Wooden Plank Flooring - Decoupling...and i put some cement blocks which have hole in the middle, they weight at least 15 kg. Now my cat have new hiding place :)
Get a smaller table.I like the idea but if i move my table back, my listening position will be at the center off the room which in my square room is the worst place to be.
I will consider it. Question is how much more i would minimize vibrations. I already did pretty good job by making my table massive and decoupling it from floor, and with these cement blocks with rockwool under it and rubber on them. ...but, i will really consider it...Get a smaller table.
here is the waterfall, what do you think?
I am sorry if i am starting to be annoying,
but i would like to show you my plan for back wall.
Should the diffusors be closer together?
and this is the design for cloud. Each panel is 200 x 60 x 10 cm.
I believe it would be good for my 47 Hz problem and for early reflections.
Am i right? Would all this make my room too dead?
One comment: The door into your room is eating up the space where you need to put another bass trap, in order to keep your room symmetrical. Symmetrical is important. There is another thread here somewhere, from someone else who has the same problem, and came up with the idea of mounting a bass trap on wheels, so he can roll it up against the door when he needs to do any critical listening. You might want to do something similar.
Its a good idea but i am much more concerned about
the whole design. I would really appreciate if some off this forums
experts could give me some feedback. Ethan, could you help?
* Looking at your lovely waterfall; you need more basstrapping. There's more than 4 corners in a square room.
* Diffusors are not a good option in a small room like that
* make the backwall one big basstrap (instead of using diffusors)
I usually stick to answering direct questions. :) I see no problems with your room, and it's clear you understand the basics. --Ethani am much more concerned about the whole design. I would really appreciate if some off this forums experts could give me some feedback. Ethan, could you help?
Thanks for your quick reply. I was thinking about
making back wall absorber, but how deep it should be
to get that 47 Hz controlled?
There's no exact science to that. Thicker wool will absorb more low FRQ, but to absorp 47Hz... dunno a yard? I'd start adding corner traps, as thick as possible (and payable), then measure again to see if the results please you. You might consider a panel/pressure/velocity (what's in a name) trap for lower frq. There's some excellent, again :), tuts on that on Ethan's site. And if all fails and you wanna control a small frq band you could consider building a tuned resonator. But start with adding wool.Thanks for your quick reply. I was thinking about making back wall absorber, but how deep it should be to get that 47 Hz controlled?
Ok, so i might be on a good road to happiness :)
I will proceed with as planed and build some more
basstraps and maybe even remove soft rockwool
from existing corners and put some rigid.
See you when i make some progress.
Thanks for your help!
Best regards,
Tomislav
Just leave the softwool and put a plastic screen in front of it to stop it from absorbing too much mid/high frq.Ok, so i might be on a good road to happiness :) I will proceed with as planed and build some more basstraps and maybe even remove soft rockwool from existing corners and put some rigid.
no worries, mate!See you when i make some progress. Thanks for your help! Best regards, Tomislav
I know you sead diffusor wont be good for my room
but i just couldn't resist to build one. And I like it.
Check it out. I just have to glue the joints, i will probably
use silicon, and stuff it with rockwool on the back side.
well, for what it's worth, that's beautiful!
nice job (even when you don't need it)
Ro, I'm curious: I've heard many people say that diffusion isn't much help in small rooms, but I've never really understood why. Could you explain? Something about sound fields, wavelengths, room dimensions, and reverberation, I guess?
Also, I guess Tomislav's diffuser won't actually do any harm to his acoustics, right? It's just that it wont help either. Is that it? (I guess the only slightly useful part would be the rockwool stuffed in the back!)
- Stuart -
Well, there's not enough volume in a small room (or wall volume) for the diffuser to develop a useable reverb and adds unwanted coloration. Especially in close range of the listening point, it'll only distort the sound image.
It's better, easier and cheaper, to have broadband absorption panels.
I'm sure Ethan could tell you much more, in detail, about diffusers in small rooms. Let's see what the MHoA has to say about this in particular.