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Discussion Starter #101
That would be the studs - a.k.a. dimensional lumber, a.k.a. 2x4s, 2x6s, etc. The drywall just covers up the studs.

But reading my answer, I must have misunderstood your question as stated. :sweat:
No not really, so when you say lumber is that plasterboard, I want to make sure I get the right materials.

Is drywall a specialist thing?

Regards
Marty
 

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Discussion Starter #104
Oh, haha, I get it now, we're talking two different dialects of English, that's the problem. Looks like Moonfly has that sorted. I should spend more time on the UK HT (I mean HC) site to stay bilingual - or bi-dialectical.
Yeah we are English so English English please :bigsmile:

I am going to the toilet.....sorry restroom :R

Such a colourful language we speak....... sorry again, I mean colorful :rofl2:
 

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Discussion Starter #106 (Edited)
I have edited this comment off in case anyone was offended :nono:

I will have to bring this conversation out of the "loo" again :D

Thanks so timber/plasterboard got it :T

Regards
Marty
 

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Discussion Starter #107
I was talking to a guy at custom audio designs about diffusers to go on the rear wall as I will not capable of building them, he recommended these http://www.customaudiodesigns.co.uk/diffusers/skyline.htm

My wife hit the roof when I showed her :R

They do a flat panel that she said would be acceptable, they did say it would not be as good but would these do the job http://www.customaudiodesigns.co.uk/diffusers/baddiff.htm

What my wife is concerned about is making our living room look like a studio and then when we listen there is no noticeable difference, I would say I am concerned about this too, will we hear a big difference, the main noticeable problem to my untrained ears is when I clap I can hear a slight echo, maybe with films slightly enhanced ssss on speech?

The other thing this guy suggested when I told him I am making absorbers for the bare wall on the left side of the room he said that as I have curtains covering most of the opposite side wall he said the absorbers wouldn't be any good, I need to put curtains down the left side of the room to balance the sound, is this correct? Will it be a waste of time making my absorbers?

I did suggest the curtains but you can imagine her reaction to this :R she said she would actually prefer absorbers disguised as pictures or with just basic fabric to match decor. Will it still make a difference having the absorbers rather than having curtains?

Thanks in advance.

Kind Regards
Marty
 

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Hard to say. Diffusion is a much more subtle effect for those who aren't critically listening.
 

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Discussion Starter #109
Hard to say. Diffusion is a much more subtle effect for those who aren't critically listening.
Well considering it is around £500 for the diffuser panels to fill up the middle space on the rear wall it will be quite a gamble.

Will the sound absorbers on the side wall disrupt the balance having curtains opposite or can it be evened out just as well, again the curtain on bare wall would like rather odd, most of the room will be covered in curtains!
 

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Panels would at least offset the higher frequency absorption from the other wall though they will reach lower (not necessarily a bad thing)
 

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Discussion Starter #111
That's good to hear :T

Would I be better off making the panels with 25mm rockwool instead of 50mm to try and get closer absorbtion to what the curtains are providing (not very much I know, but I have no choice whatsoever to have curtains that side)
 

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50mm will be fine. No need to further skew the high frequency absorption compared to the rest of the spectrum.
 

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Discussion Starter #114
My room length is 18 feet?

In regards to the surrounds I sat in the 5 feet from rear wall position and moved the speakers around on ladders testing material, the rear wall about 1 and a half feet from the corners sounded best, then I was trying seating position and i found that closer to them there is details I can hear which I cannot from the 5 feet position. The main thing I noticed is on the thx scene on indy 4 bluray, when the flowers start fluttering around the rear speakers the finally shift across the rear soundstage from left to right, when I sit in the 5 feet forward position you cant really tell what direction the fluttering goes?


This is the results without amps eq and without smoothing, the only thing that was applied was I adjusted the phase to raise a large dip around 50-60hz and the svs subs parametric equaliser to iron out a large peak around 35hz.

2 feet from wall
View attachment 26720

5 feet from wall
View attachment 26721

Thanks
Marty
You could still potentially play with speaker and sub locations to see if anything else can be done. Treatment can add additional help but I'd like to get you as good as possible before hand so we can best identify what is causing the remaining problems.
Okay it's been a while but I have not been adding any room treatments yet, I have however managed to get the subs and mains response as best as possible in my room, it is looking a lot better than before, so now I need to begin room treatment, I seem to have a problem above 120 hz, I have the speakers crossover at 80hz on amp, when I measured left and right mains speakers by themselves I found that the front left speaker, which has all bare wall to the side of it measured pretty flat, the right speaker which has all curtains along the side wall (covering a window) is all over the place.

I have experimented with the mains as much as poss and found that I have to have them about half a foot from the side walls and about 2 inches from the front wall (just behind them) If I move them away from these walls the dips above 120hz become more prominent.

What do I need to do next? although the sound is really good I still feel that the sound can be softened a tad and maybe a bit more upper bass punch is needed, I still have bare back wall that could do with some diffusion and the left hand side of the room is all bare wall. I can only afford to do a bit at a time so I am thinking the rear wall diffusion should be attented to first but I would appreciate your advise again please Bryan :bigsmile:

Just to add I found that sitting any closer to the screen than 3 feet from the rear wall was too much for the eyes to take so this is the final seating position.
 

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Are you using the xover on your processor and on the sub? Should just use the one on the processor and max or defeat the one on the sub.

If speaker positioning that close to a boundary, you're using SBIR to tame another problem. We just need to see where it's coming from. If you move them out farther, what do you need to do in terms of mic position to get it to move/change intenstity? Forward/back movement? Side to side movement? Vertical?

Bryan
 

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Discussion Starter #116
Are you using the xover on your processor and on the sub? Should just use the one on the processor and max or defeat the one on the sub.

If speaker positioning that close to a boundary, you're using SBIR to tame another problem. We just need to see where it's coming from. If you move them out farther, what do you need to do in terms of mic position to get it to move/change intenstity? Forward/back movement? Side to side movement? Vertical?

Bryan
I am just using amps XO the sub is fully open.

SBIR?

I will have to work around the wife when I get a chance, so what you are saying is I need to move the speakers away from the walls and remeasure with the mic in different positions around my main listening position is that right?

Just out of curiousity does it look like I have tamed any noticeable problems with the subs response, I've posted a waterfall too but I have no idea how they work, I assume it is important to look at when beginning room treatments?

Marty
 

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SBIR is a boundary related bass anomaly caused by spherical bass radiation pattern causing constructive and destructive (peaks and nulls) due to quick, strong reflections from nearby surfaces.

It is likely that those are compensating for problems related to seating position or other problems that could potentially be addressed with treatments.

Bryan
 

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Discussion Starter #118
SBIR is a boundary related bass anomaly caused by spherical bass radiation pattern causing constructive and destructive (peaks and nulls) due to quick, strong reflections from nearby surfaces.

It is likely that those are compensating for problems related to seating position or other problems that could potentially be addressed with treatments.

Bryan
So does that mean I need to measure around my listening position with speakers away from the walls to get an idea of where to treat?
 

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My first shot would be to leave everything as is and just move the mic back or forward say 12-18" and take another measurement and see what that dip does. Whenever taking more measurements, only move one thing at a time so we KNOW what's going on.

Bryan
 

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Discussion Starter #120
My first shot would be to leave everything as is and just move the mic back or forward say 12-18" and take another measurement and see what that dip does. Whenever taking more measurements, only move one thing at a time so we KNOW what's going on.

Bryan
Ok I will give it a try, the only problem I do have is that my seating position is limited, due to screen size and the fact it has been very difficult to get this response from my sub, every sub/seating position had major dips apart from this one which to me, looks like I have got it inbetween the target +5/-5db range up until the 120hz, I dont think it will be possible to improve on that kind of response without an eq device?

So I am reluctant to change anything, when I move the speakers around the peaks and dips above 120hz, mainly dips, appear bigger and bigger :eek:

Kind Regards
Marty
 
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