Xecuter Posted December 27, 2018 Posted December 27, 2018 What kind of membrane are you guys thinking? Trying to find a good material to keep the material from getting out of a fabric covered trap.
almikel Posted December 27, 2018 Posted December 27, 2018 Pete is suggesting 75 micron plastic On 26/12/2018 at 7:14 AM, Peter the Greek said: (75 micron laminating film) you don't need it to keep the fibres in. Any close weave fabric would do, but the membrane would improve low freq performance and help to reflect higher freq. mike 1
Xecuter Posted December 27, 2018 Posted December 27, 2018 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.
jamiebosco Posted December 27, 2018 Posted December 27, 2018 2 hours ago, davewantsmoore said: Which Autex product you looking at?! haha...the stuff in my lounge room. Of course that's just my opinion Polymax XHD 50mm in Black Autex Greenstuff 100mm in Black
davewantsmoore Posted December 27, 2018 Posted December 27, 2018 11 hours ago, jamiebosco said: my opinion Seems quite reasonable. I have Martini Absorb, and it looks more like the Autex.... although perhaps not quite as good..... but nothing like the polymax (the the lines) 1
almikel Posted December 28, 2018 Posted December 28, 2018 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. Real Traps use something very similar (FRK) in some of their commercial traps They wouldn't use it if it didn't work Mike
Guest Peter the Greek Posted December 28, 2018 Posted December 28, 2018 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
almikel Posted December 29, 2018 Posted December 29, 2018 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
Guest Peter the Greek Posted December 29, 2018 Posted December 29, 2018 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
almikel Posted December 31, 2018 Posted December 31, 2018 (edited) 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 December 31, 2018 by almikel
everdingk Posted January 2, 2019 Posted January 2, 2019 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 Autex Greenstuff 100mm in Black This looks great... how did you mount it? 1
jamiebosco Posted January 2, 2019 Posted January 2, 2019 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.
Chargin Posted March 1, 2019 Posted March 1, 2019 A bit off topic I know, BUT does anyone have an opinion on these off the shelf panels? https://www.ebay.com.au/itm/Raven-Acoustic-Studio-Panel-Sound-Absorption-Wall-120cm-x-60cm-x-6-5/153243083275?hash=item23adffe20b:g:Ax4AAOSwmDBb2-za:rk:2:pf:0 Ive read this whole thread and its probably one of the best places around to learn about acoustic panels in Aus. So I thought adding in some links to options Ive found may interest others and Im interested in buying about 6 of these panels. Seems fairly economical as I wont have to do any DIY which Im well setup for but cant be bothered with.... I also found another site with off the shelf panels: https://www.aluforminteriors.com.au/product/interior-acoustics/ I did like the 3d ones but they are a bit pricey. Basically Ive found it hard to find things I can just buy online and hang on the wall. So the above 2 links might be of interest to others as well.
Ugly Posted March 1, 2019 Posted March 1, 2019 1 hour ago, Chargin said: A bit off topic I know, BUT does anyone have an opinion on these off the shelf panels? https://www.ebay.com.au/itm/Raven-Acoustic-Studio-Panel-Sound-Absorption-Wall-120cm-x-60cm-x-6-5/153243083275?hash=item23adffe20b:g:Ax4AAOSwmDBb2-za:rk:2:pf:0 Ive read this whole thread and its probably one of the best places around to learn about acoustic panels in Aus. So I thought adding in some links to options Ive found may interest others and Im interested in buying about 6 of these panels. Seems fairly economical as I wont have to do any DIY which Im well setup for but cant be bothered with.... I also found another site with off the shelf panels: https://www.aluforminteriors.com.au/product/interior-acoustics/ I did like the 3d ones but they are a bit pricey. Basically Ive found it hard to find things I can just buy online and hang on the wall. So the above 2 links might be of interest to others as well. I can't see any data about the panels other that physical size so there is no way to compare it to other materials. For all we know it may look the business but just be soft useless foam underneath.
Xecuter Posted March 4, 2019 Posted March 4, 2019 Need a hand. I made some great bass traps using the ultratel Glass wool. But I think some fibres are escaping through the speaker fabric (double thickness) I used on the front. Sides are sealed with very thin foam membrane (watertight). Looking for an audible transparent black fabric that looks decent and doesn't cost a bomb but has a very very fine weave. So the glass fibres stay in the box. This is only a problem because I have very sensitive airways to dust/mould/irritants.
mfc83 Posted March 4, 2019 Posted March 4, 2019 Hey @Xecuter, did you also evaluate Bradford's Soundscreen range? It's much cheaper than the Ultratel. The data sheet shows superior performance above 125Hz, but worse for 125Hz. The measurements were done according to different ISO standards though, so maybe they can't be compared directly.
Xecuter Posted March 4, 2019 Posted March 4, 2019 @mfc83 I was only really targetting 125 hz and below for the bass traps. I have about 20 vicousitic panels for my mid to high frequency. 1
almikel Posted March 5, 2019 Posted March 5, 2019 23 hours ago, Xecuter said: Looking for an audible transparent black fabric that looks decent and doesn't cost a bomb but has a very very fine weave. So the glass fibres stay in the box. @Peter the Greek had a fabric he recommended for covering fibreglass - or swap the Ultratel for poly. Poly works nearly as well as fibreglass, so if you're sensitive to fibreglass, I'd get rid of it and replace with poly. cheers Mike
almikel Posted March 5, 2019 Posted March 5, 2019 12 hours ago, Xecuter said: I was only really targetting 125 hz and below for the bass traps. That's a tough gig for absorption - it needs to be truly massive to work that low...if you have EQ capability, a few bands of EQ can work wonders <125Hz in lightly constructed rooms where no significant bass remains in the room (because it goes through the walls). Mike 1
Xecuter Posted March 5, 2019 Posted March 5, 2019 Hey Mike, I spent about $700 on ultratel and had my walls filled with it as well as put the large traps behind the speakers. https://www.superbestaudiofriends.org/index.php?threads/general-speaker-advice-and-recommendations.4062/page-49#post-241719 Some measurements there to confirm a bit of success with my null. Maybe ill sell these and just rebuild with poly.
Guest Peter the Greek Posted March 5, 2019 Posted March 5, 2019 1 hour ago, almikel said: @Peter the Greek had a fabric he recommended for covering fibreglass - or swap the Ultratel for poly. http://www.rimfabrics.com.au/trilogy-one.php Polyester is an ass.....I'm on the fence we to what I'll use next time round
Xecuter Posted March 5, 2019 Posted March 5, 2019 I'll order a roll I guess. What are your thoughts on using a hepa filter fabric @Peter the Greek? https://www.aliexpress.com/item/1m-1m-Thickness-15mm-Home-Fabric-Black-Air-Conditioner-Activated-Carbon-HEPA-Air-Purifiers-Accessories-Purifier/32820257420.html
Guest Peter the Greek Posted March 5, 2019 Posted March 5, 2019 2 minutes ago, Xecuter said: I'll order a roll I guess. What are your thoughts on using a hepa filter fabric @Peter the Greek? https://www.aliexpress.com/item/1m-1m-Thickness-15mm-Home-Fabric-Black-Air-Conditioner-Activated-Carbon-HEPA-Air-Purifiers-Accessories-Purifier/32820257420.html No idea....I'm no expert on these things. I'd suggest it'd be a bastard to keep clean and dust free. People have been saying for years on AVS that if you cover the fibreglass in fabric its all good....I dont know. I think its low VOC? in any event.....as I say....its a ***** to cut the poly. The HD glass batts aren't like pink batts. They hold together nicely, so unless you're a complete fool, you'll not make a big mess
almikel Posted March 5, 2019 Posted March 5, 2019 32 minutes ago, Peter the Greek said: .....as I say....its a ***** to cut the poly. agreed - poly is a PITA to cut
Guest Peter the Greek Posted March 5, 2019 Posted March 5, 2019 Isn't ultratel made for duct lining? Would "suggest" its safe if protected....who knows I think its cheaper too?
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