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Need help setting up my Room (Placement of acoustic panels / bass traps etc)
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Lewis.
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#1
22nd September 2010
Old 22nd September 2010
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Arrow Need help setting up my Room (Placement of acoustic panels / bass traps etc)

Firstly hi, my first post, excellent forum!

I bought some of these 'Offeccet' Acoustic panels and just need a bit of help / advice as to where I should place them (and don't say in the bin!) My listening position is pretty much a bass void, so I need to strain to hear the bass and it doesn't improve until I stand up, or move forward. The wife is getting another chair to go to the left of the system so can't move the couch forward. Just wondering where the best place would be to put these panels. They seem to improve the sound a bit..they're designed for low frequencies which are the stem of my problem. I think I may need more, either that or I sell them and buy some more heavy duty rockwool types, as the insulation within these is pretty thin. How about replacing their contents with thicker acoustic foam, would that help too?

Here are some pics to give you an idea of how it is at present (using the mirror trick i've placed them at the first reflection points. There's a bit of an echo in the room when you snap your fingers / clap your hands at the listening position too, so thought these would improve that.









All help will be much appreciated!


Thanks guys
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23rd September 2010
Old 23rd September 2010
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I bought some of these 'Offeccet' Acoustic panels and just need a bit of help / advice as to where I should place them
Usually the best advice comes from the manufacturer. But this short article explain the basics, and includes links to more detailed explanations:

Acoustic Basics

--Ethan

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Lewis.
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4th October 2010
Old 4th October 2010
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Thanks Ethan. I've read a lot of your stuff in the past and found it to be very helpful.

One more question on my bass traps - they are foam/rock wool filled. Should I drill some round 25mm holes in the sides so they absorb sound side on too? It's an idea i've been toying with. They are better if they are behind the listener from their design (or so I think) so having some holes in the side the acoustic energy could enter that way too right - what do you think?
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4th October 2010
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I looked those panels up OFFECCT

They operate in the 150-500Hz range (although the site offers no more tech data other than that) so are not for use at first reflection points. You need to figure out which boundary surfaces of your room are causing the modal effects and place the panels on them.

I'm guessing the panels are some sort of broadband Helmholtz panel. Drilling holes in the side will impair their performance.

You may need a few more than the 4 panels though. Sell your speaker cable risers and spend the money on something that will have an effect the sound

EDIT: those speaker cable risers are in your line of sight from the listening position so probably will affect your perception (as you can see them). They are doing nothing physically but if you think they improve the sound, their only effect is psychological. Having said that they do keep things neat and tidy, you can vacuum/dust under the cables easily I suppose! Just hope you didn't pay a silly amount of money for them.....
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4th October 2010
Old 4th October 2010
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Need help setting up my Room (Placement of acoustic panels / bass traps etc)

Thanks for the reply Dange. Ok so they should ideally be placed behind me then I guess so the speakers are firing directly towards them. I get a lot of bass on the left side wall towards the rear, does it matter if the panels are side on - will they still absorb bass like this? I will post more pics later to illustrate my room as its not ideal on the rear wall for placement of panels due to a door and notice board! So what do you recommend for first reflection points? Diffussion instead? I was considering some rpg skyline panels. There's a lot of echo when I clap my hands despite the heavy rug, and there's now a fabric armchair to the left too. I'll put up more pics later so you guys can get the jhist!
Lewis.
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4th October 2010
Old 4th October 2010
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Need help setting up my Room (Placement of acoustic panels / bass traps etc)

Forgot to say: yea I know the cable elevators do nothing at all but o got them purely because they look neat and stop the cables getting covered in dust and stuff - hoovering around that area is way easier now! They weren't expensive either.
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4th October 2010
Old 4th October 2010
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Quote:
Originally Posted by Lewis. View Post
Forgot to say: yea I know the cable elevators do nothing at all but o got them purely because they look neat and stop the cables getting covered in dust and stuff - hoovering around that area is way easier now! They weren't expensive either.
It is amazing how many posts I have read where the person SWORE the sound was better.
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Built in Slat design (Scattering/Diffusion) on all Bass Traps click here
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4th October 2010
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Should I drill some round 25mm holes in the sides so they absorb sound side on too?
Sure, it can only help.

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4th October 2010
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Should I drill some round 25mm holes in the sides so they absorb sound side on too?
If the device relies on membrane/helmholtz principle: absolutely not, since that would reduce the performance drastically.
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4th October 2010
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But if the source and amplifier are set above the speakers, the downward orientation of the cables placed upon properly elevated and calibrated cable stands would allow gravity to help the little electrons more efficiently traverse the distance, thus increasing the efficiency of the speakers.

...Not to mention that it would help the cables avoid drafts and colds.

You see, there was a benefit of spending far too many years studying fissiks!

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4th October 2010
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But if the source and amplifier are set above the speakers, the downward orientation of the cables would allow gravity to help the little electrons more efficiently traverse the distance, thus increasing the efficiency of the speakers.

You see, there was a benefit of spending far too many years studying fissiks!

Lewis.
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5th October 2010
Old 5th October 2010
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Need help setting up my Room (Placement of acoustic panels / bass traps etc)

Back on topic. What are we thinking for the side Walls instead? Diffussion?
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5th October 2010
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Back on topic. What are we thinking for the side Walls instead? Diffussion?
Before you start to treat against something, it’s usually a good thing to know what we are trying to fix.
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5th October 2010
Old 5th October 2010
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Ah sorry - I thought I had mentioned it but obviously not! My mistake!

Well theres a pretty bad bass null at the listening position, which vansihes when I either stand up, or put my head close to the floor and lean forward a little while seated. Mid and treble are ok, although there's some high pitched echo present when you clap so that needs to be addressed also.

Any help is much appreciated! thanks
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5th October 2010
Old 5th October 2010
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Quote:
Originally Posted by Lewis. View Post
Ah sorry - I thought I had mentioned it but obviously not! My mistake!

Well theres a pretty bad bass null at the listening position, which vansihes when I either stand up, or put my head close to the floor and lean forward a little while seated. Mid and treble are ok, although there's some high pitched echo present when you clap so that needs to be addressed also.

Any help is much appreciated! thanks
The nulls are related to modal issues and perhaps some SBIR. The "flutter" can be addressed with diffusers and/or absorbers. You should make some measurements to be able to verify what the exact problems are and try to understand the behavior of these in order to successfully treat them. This applies especially to the modal response of your room. There are tons of threads in the forum that deals with these questions.

Sincerely Jens Eklund
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