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Polymax Absorb XHD 100mm batts

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18 hours ago, Xecuter said:

interesting, what about perforated foil? Those measurements from bradford suggest that it also improves low frequency but will absorb less at higher frequency.

pretty big improvement even at 25mm thickness.

 

image.thumb.png.596988c2dbbccdacd211bfa0d50cbbd8.png

Real Traps use something very similar (FRK) in some of their commercial traps

They wouldn't use it if it didn't work

 

Mike

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Sorry folks, super busy ATM. 75 micron is pretty thin. A little less than builders plastic,  but probablyno tg a huge deal. I've beenin a room that used the black roll plastic from bunnings,  no issues. I puchased a massive roll years ago ....it'll last forever.

 

It's been years since I've run the numbers, but if I recall, it makes 25mm behave like 50mm, 50 like 100 etc

 

RIM trilogy one is the only fabric I'll ever use again,  its superb to work with 

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17 hours ago, Peter the Greek said:

it makes 25mm behave like 50mm, 50 like 100 etc

it's the effect on bass absorption with multiple layers that interests me...

My room has several layers of 75mm Acoustisorb, still in full 2400x1200 sheets.

Pretty easy to sandwich some builders plastic in between.

 

I've never tried using a membrane over/in between layers of absorption, and I'm unclear of the science, as it's not a "narrow band" membrane trap, which is sealed and tuned to a specific frequency, just a membrane over/in between absorption, potentially improving bass performance and reflecting higher frequencies.

 

cheers

Mike

 

 

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3 hours ago, almikel said:

it's the effect on bass absorption with multiple layers that interests me...

My room has several layers of 75mm Acoustisorb, still in full 2400x1200 sheets.

Pretty easy to sandwich some builders plastic in between.

  

I've never tried using a membrane over/in between layers of absorption, and I'm unclear of the science, as it's not a "narrow band" membrane trap, which is sealed and tuned to a specific frequency, just a membrane over/in between absorption, potentially improving bass performance and reflecting higher frequencies.

  

cheers

Mike

 

 

Give it a go and see I suppose. I've never used these panels for bass treatment

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On 29/12/2018 at 6:02 PM, Peter the Greek said:

Give it a go and see I suppose. I've never used these panels for bass treatment

the challenge would be not moving the mike (edit: or the speakers) while maneuvering large sheets of plastic in between the layers of Acoustisorb.

I'll see if I can find a roll of builders plastic cheap on the web...a much simpler and easier project than building a limp mass trap, and easily expanded to include vertical strips of plastic on the front face in a 1D BAD pattern like you suggested ages ago.

 

cheers

Mike

Edited by almikel

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On 27/12/2018 at 8:45 PM, jamiebosco said:

haha...the stuff in my lounge room. Of course that's just my opinion

 

Polymax XHD 50mm in Black

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Autex Greenstuff 100mm in Black

 

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This looks great... how did you mount it?

 

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5 hours ago, everdingk said:

This looks great... how did you mount it?

 

thanks....though my wife may disagree!

 

Nothing fancy, it's 2 x 120cm x 240cm x 10cm Autex panels put together behind my speakers/subs/TV. They are sitting on some  blocks (to give some clearance underneath the panels for cables and ventilation for the AVR) and a simple L bracket  on each side to prevent them falling forward - they probably would be fine without the brackets as the AV unit also holds them against the wall.

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