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Speaker length for new home theatre room


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Hi guys, building myself a 5 m by 6 m home theatre room concrete wall construction and and considering my speaker cable runs.

 

What's the distance I should avoid going beyond with my speaker cable and also speakon cables?

 

My front of 4 ohm speakers and my subwoofers are 1000 Watts each

 

I was considering putting my amps at the back of the room which would mean long speaker cable runs. But now I'm doubting my decision, i might just put the amps at the front so speaker cables are shortest and don't run into any sound quality issues.

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Guest Peter the Greek

10 to 12 awg multi stranded wire. I've used this stuff and liked it https://www.renovatorstore.com.au/cables/speaker-cables/ultra-premium-speaker-cable-12awg-100m.html

 

I'm a fan of racks out side of the room, but failing that, back is best IMHO. Don't worry about run length.

 

That's a great sized room, best of luck with it!

 

 

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On a different topic. Your concrete room is going to give you massive bass problems that requires treatment. These traps are going to take up some real estate, so try to find your room problems before the build so that you might integrate these traps into your room design.

With the room your size, you should be able to control these issues without making the room to small with some clever ideas. With a room of 5 meter lengte and probably a ceiling hiegt around 2.4 Meyer you are likely going to have some overlapping room nodes.

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Thanks for the table that'll help.

 

 

On a different topic. Your concrete room is going to give you massive bass problems that requires treatment.

 

Oh dear. Because concrete is highly reflective? You have me intrigued. So solution is bass traps behind the projector screen? Or similar ?

 

 

Will a bunch of something like this do?

 

https://m.au.dhgate.com/product/12-pack-acoustic-foam-bass-trap-sound-absorption/406637600.html?f=bm|406637600|019034|GMC|1029941465|pla|saulgoodman|AU|019034005|m||2|#pd-019

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41 minutes ago, Kezzbot said:

 

Thanks for the table that'll help.

 

 

 

 

Oh dear. Because concrete is highly reflective? You have me intrigued. So solution is bass traps behind the projector screen? Or similar ?

 

 

Will a bunch of something like this do?

 

https://m.au.dhgate.com/product/12-pack-acoustic-foam-bass-trap-sound-absorption/406637600.html?f=bm|406637600|019034|GMC|1029941465|pla|saulgoodman|AU|019034005|m||2|#pd-019

Interestingly, in modern design concert halls, large scale concrete construction is used as aiding bass reinforcement, particularly around the stage area. Personally, I would have no issue with concrete walls and prefer over lightweight construction. Gyprock is a very average material acoustically as it acts like a drum skin over a large frequency range. We recently spent a lot of time in Japan and concrete is very much a chosen material and generally acoustics were superb.

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Thanks for the table that'll help.
 
 

 
Oh dear. Because concrete is highly reflective? You have me intrigued. So solution is bass traps behind the projector screen? Or similar ?
 
 
Will a bunch of something like this do?
 
https://m.au.dhgate.com/product/12-pack-acoustic-foam-bass-trap-sound-absorption/406637600.html?f=bm|406637600|019034|GMC|1029941465|pla|saulgoodman|AU|019034005|m||2|#pd-019
Unlikely, but I can't comment on them since I haven't used them.

Concrete is dense, so it will keep most of the energy inside the room. This energy needs to be trapped because it will cloud the whole of your low and sub range.

Room nodes will have a bigger impact as well.

Testing and measuring can map these problems before the build, and can be dealt with by adjusting seating position, subwoofer placement, adding subwoofers, velocity based bass traps and distance, and EQ as well.

But you have to take this one step at the time. It's well worth the effort, and planning can make live so much easier.
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Interestingly, in modern design concert halls, large scale concrete construction is used as aiding bass reinforcement, particularly around the stage area. Personally, I would have no issue with concrete walls and prefer over lightweight construction. Gyprock is a very average material acoustically as it acts like a drum skin over a large frequency range. We recently spent a lot of time in Japan and concrete is very much a chosen material and generally acoustics were superb.
Small room acoustics are in no way comparable with large room acoustics. Large volume and low frequencies requires massive output. So it makes sense you want to keep as much LF energy within a building to make life easy or even possible.
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Great info there thanks

I have one more question for you can I run my speakon cable with power cable?
With enough distance between the two cables, yes. It usually is better to avoid and where cables need to cross each other, to do it like a cross section, 90 degree angle.

If needed, research shielded power cables as that might help, but I don't know enough of electrics, if there is any value in it.
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18 hours ago, Kezzbot said:

speaker cable runs

Keep them as short as possible.    Prefer longer runs between source/preamp/power amps .... as opposed to long speaker cable runs.

 

That being said a few meters of speaker cable won't be the end of the world either - assuming the cable is of reasonable quality.

Edited by davewantsmoore
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16 hours ago, Kezzbot said:

 

Thanks for the table that'll help.

 

 

 

 

Oh dear. Because concrete is highly reflective? You have me intrigued. So solution is bass traps behind the projector screen? Or similar ?

 

 

Will a bunch of something like this do?

 

https://m.au.dhgate.com/product/12-pack-acoustic-foam-bass-trap-sound-absorption/406637600.html?f=bm|406637600|019034|GMC|1029941465|pla|saulgoodman|AU|019034005|m||2|#pd-019

You can get a rough idea of what could end up the problem frequencies for your proposed room if you input the dimensions into one of the free online room mode calculating software programs available.

http://www.mcsquared.com/modecalc.htm

or

http://realtraps.com/modecalc.htm

 

Since the room has yet to be built, with some care you could change the dimensions to nullify some of the worse offenders.

I good trick is to use / build seat risers and double duty them as bass traps.

Edited by Tweaky
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