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Hi Wayne, The graph looks great and I agree that if you can achieve that response with no treatment then great. I would like to see graphs on a grid of 2m x 1m (maybe 10 points)that approximates 2 couches in a theatre - much different to a single spot. Getting a response at 1 spot is not too...

Hi Omard, You may have some reading ahead of you :-). I can only comment on acoustics. Consider how soundproof you want to be from both the point of sound getting in and sound getting out. Try to consider room dimension ratios and where you can place treatment like absorbers. They can generally...

Darron, Sounds reasonable. Remember to put them where the early reflections would occur. Consider some across the room corners too. Paul, I agree with you completely. That is one of my favourite sites. Most people though have standard speakers etc and will have room problems. The basic...

Hi All, Just a few comments on this long thread. Optimised room ratios dont eliminate room modes, they make the distribution of modes i.e. how they are spread or bunched, better. Different room ratios will just have different modes. If we assume a reasonably 'flat' speaker response but a...

Brandon, Can you describe the frequency of the reflections? High, mid low??? Andrew

Gary, A couple of inches of fibreglass with an inch or so of air behind it will work well for mid and high frequencies. What other acoustic treatment have you planned? Andrew

Hi Steven, First of all, can you isolate the sub from the floor somehow? Spikes etc. Bass traps will work in the sense that once you remove the nasty reflections you will probably turn the sub down a little as the rooms frequency response and decay time are better. As for actually...

I have to second what Mark just said - the room acoustics at those frequencies will be much more significant unless you are in a very very well treated room. Has anyone wondered if passive radiator is worst, ported is next and sealed box is best - does this progression point towards dipoles...

Hi Chris, Radiussing the corners may make a slight difference, of course it depends on how big you want to make them. Is there a reason that you don't want to use traps? They work extremely well. Tell me a little about your room - dimentions etc and I may be able to offer more suggestions. PS...

Hi Shane, Foam will work. Fibreglass will work too and is often more efficient (depending on density). There are manufacturers of nice fabric finished pre made f/glass panels around. Neither will do much for low frequency though and if you absorb all the mid highs and not the low end it may...

Hi Paul, If you contact the local manufacturers like Boral they will give you the acoustic specs for the wall configurations you are considering. The curtains will do very little to reduce transmission outside. The best bet is to build the plaster wall separate from the block wall. Use...

Hi Rudolph, I can't post messages with URLs but the info you want is all there. I think this is a legitimate post so try to go to recording.org/users/acoustics/ with the usual prefix Andrew

Do you have a floor plan so that I can see the dimensions? Height/Width/Length ratios will affect the acoustics. If you want to enjoy the movies properly (90)then you will need to realise that the sound makes up 50% of the experience. Plain sheetrock walls will allow excessive reverb which will...

Hi Rudolph, Moving subs won't affect the boominess much. The problem is standing waves in the room you are in and at low frequencies the speakers are effectively omnidirectional. You may be able to find a spot where it sounds good but thats no good if there is more than just you as the sound...

If you are an EE take a look at Siegfried Linkwitz's ( called linkwitzlab )page it will suit your way of thinking and it explains a lot Small drivers are better for transient response (all else being equal) but less capable of low frequency reproduction - as always the task is to find best...