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Old 20th January 2006, 04:21 AM   #1
diyAudio Member
Join Date: Apr 2005
Location: rochester
Default Room Acoustics

Just wanted to put up a post to explain my new dilemna, I just moved into my new dorm room and to my horror, the acoustics SUCK!!

I was excited when I first got in because I noticed very tall ceilings (9ft or more) and all the walls made out of cinderblocks. I remember seeing some exotic speaker designs made with concrete and was hoping that it would be better than my bedroom at home with it's drywall. Basically though the walls act like mirrors for the sound, the bass being a particular problem.

My setup is a Sony CDP CA70es, early 90's pioneer reciever and a pair of wharfedale 8.2's, all of which I am very happy with.

Hopefully in a couple days I'll post a pic of the setups i've tried so far, some were much better than others, but still not as good as at home. I'm looking into buying some foam insulation panels from home depot in the next few days to try to tame this beast. Any suggestions/recommendations would be welcome.
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Old 20th January 2006, 06:36 AM   #2
Volenti is offline Volenti  Australia
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Join Date: Aug 2003
Location: Australia

You'll want basstraps, and lots of them.
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Old 21st January 2006, 05:47 AM   #3
filgor is offline filgor  Australia
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Join Date: Sep 2004
Location: Sydney
If you cant afford bass traps (they are usually unreasonably expensive) then any large blocks of soft foam will do the trick.

Another pragmatic option is to hang a heavy curtain on one or more walls. This option is a lot cheaper and curtains if heavy enough can actually take energy out of bass waves quicker than Bass traps due to the fact that they have such a high surface area. When a wave hits a curtain it delivers a large amount of its kinetic energy to the fabric which absorbs the energy very quickly.

Hifi places like to sell bass traps because they can charge lots for them and they would probably disagree that curtains do the job because it will kill their bass trap sales!

For a given amount of surface area bass traps might be better but cost per area may be a bigger issue for you!
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Old 21st January 2006, 11:57 AM   #4
thalis is offline thalis  Greece
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Join Date: Jan 2004
Location: Athens
Yes, heavy curtains will absorb lower frequencies but in the same time they will absorb mid and high frequencies in a greater amount. In the end he will have the about same reverberation slope and comparative room frequency response. A cheap diaphragm construction would be perhaps better. Either plasterboard or thin mdf or plywood, preferably with some pitching, lightly braced, 10-12 cm cavity and some absorbent material inside, in his roof for instance. In general, the best way to absorb lower frequencies is with heavy and not stiff diaphragms. No special material required either.

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Old 21st January 2006, 01:42 PM   #5
filgor is offline filgor  Australia
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Join Date: Sep 2004
Location: Sydney
Originally posted by thalis
Yes, heavy curtains will absorb lower frequencies but in the same time they will absorb mid and high frequencies in a greater amount.

Damn right.. It absorbs just about everything. Thats the way I like it!

If you want to keep the room live in the mids and highs a diaphram might be a better option!
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