bass traps done, what next?

[chrisjade]

hey slutters

got some awesome advice the first time i posted so thanks to everyone.
really like this forum.

my bass traps are looking good. and sounding insane!
im a bit unsure as what to do next in my room,
bass trap for back wall as glen suggested-
what kind of design should this be:
i would assume panels mounted at ear level.

first reflection point panels on side walls, is 2in thick enough for these:
i assume cover as much area as you can.

here's my room:

[Glenn Kuras]

bass trap for back wall as glen suggested-
what kind of design should this be:
i would assume panels mounted at ear level.

I would make them 6" thick and ear level is fine.

first reflection point panels on side walls, is 2in thick enough for these:
i assume cover as much area as you can.

You got it.

[Jens Eklund]

Originally Posted by chrisjade

first reflection point panels on side walls, is 2in thick enough for these:
i assume cover as much area as you can.

2” would not be very effective below approx 800 Hz (0-30 deg incident). 4” would stretch things down to approx 300 Hz.

You do not want to cover “as much area as you can” unless you want a dead sounding room. Treat only the areas that otherwise would result in reflections arriving within the ISD-gap. Other areas could be treated with either bass absorbers or diffusers.


Sincerely Jens Eklund

[Glenn Kuras]

2” would not be very effective below approx 800 Hz (0-30 deg incident). 4” would stretch things down to approx 300 Hz.

Not so sure about 800 hz but yes using 4" is always welcome.

You do not want to cover “as much area as you can” unless you want a dead sounding room. Treat only the areas that otherwise would result in reflections arriving within the ISD-gap. Other areas could be treated with either bass absorbers or diffusers.

I think want he was talking about was between where he sits and the monitors. If you mix moving your head around (like I do) I would cover as much of that area as possible. I like a 4'x4' area.
Your points are well taken though.

[Jens Eklund]

Originally Posted by Glenn Kuras

Not so sure about 800 hz but yes using 4" is always welcome.

If dense ( ≈ high flow resistivity) wool is used, perhaps a bit lower but still:







Rockwool Sonorock
ITA RWTH Aachen
13,6 kPa*s/m2
38,9 kg/m3

and;

Rockwool RPI-7
ITA - RWTH Aachen
45,0 kPa*s/m2
75,0 kg/m3

@ 0 and 30 degrees incident angels.



Sincerely Jens Eklund

[chrisjade]

yes your right, the wall area between speakers and ears.

will do the 6in bass trap on the back wall first.
then use whats left on the first reflection points.
2in thick panels, might double it later (thanks).

i have caught the bug, will definately think about
making some more in
the future.
CHRIS

[chrisjade]

i have the acoustisorb 3, as rockwool is not readily availible in australia.
it costs a fair bit unfortunately.

i think its rated at 48kg per m2.
best i could find.

CHEERS FROM OZ

[Glenn Kuras]

Originally Posted by Jens Eklund

If dense ( ≈ high flow resistivity) wool is used, perhaps a bit lower but still:

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http://www.bobgolds.com/AbsorptionCoefficients.htm

[Jens Eklund]

Originally Posted by Glenn Kuras

http://www.bobgolds.com/AbsorptionCoefficients.htm

Random incident using reverberation room method (with the diffraction effect included) I suppose?

If we are trying to absorb a specular reflection, the angle of incident is usually approx 0-30 degrees.


/Jens

[AnthonyRochester]

Originally Posted by chrisjade

i have the acoustisorb 3, as rockwool is not readily availible in australia.
it costs a fair bit unfortunately.

i think its rated at 48kg per m2.
best i could find.

CHEERS FROM OZ

I'm in Australia and CSR Soundscreen is readily available and not too expensive at Bunnings etc. I think its 32 kg/m^3 which may not be perfect but has produced great results for my panels.

[chrisjade]

Originally Posted by beebay007

I'm in Australia and CSR Soundscreen is readily available and not too expensive at Bunnings etc. I think its 32 kg/m^3 which may not be perfect but has produced great results for my panels.

thanks for that.thumbsup
so that stuff is not ideal for bass traps but ok for panels?
what thickness do you use in your panels?

do you need to wear protection for that stuff?

CHRIS

[AnthonyRochester]

it works great for bass traps too. I use 2 layers which makes it 15cm deep (almost 6 inches)

[AnthonyRochester]

and yeah I wear gloves/mask etc cos it does make your skin itchy and I don't really want to breathe in the fibres. But once it is covered it is fine.

[chrisjade]

Originally Posted by beebay007

and yeah I wear gloves/mask etc cos it does make your skin itchy and I don't really want to breathe in the fibres. But once it is covered it is fine.

bit worried about that.

THANKS

[AnthonyRochester]

Don't worry too much, its not asbestos..

[chrisjade]

Originally Posted by beebay007

Don't worry too much, its not asbestos..

ha, my whole school was full of that stuff and im still here!

will source out some 'csr soundscreen' for my panels.
do these panels require a solid backing?

[AnthonyRochester]

Originally Posted by chrisjade

do these panels require a solid backing?

No. Just make frames for the outside edges and cover with fabric. There's lots of threads here with more detail and plans..