Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Planet 10 hifi Home of the Frugal-phile™ - Planet 10 HiFi

Reply
 
Thread Tools Search this Thread
Old 25th March 2015, 02:33 PM   #1
timpert is offline timpert  Netherlands
diyAudio Member
 
Join Date: Nov 2004
Location: Netherlands
Default Is this material suitable for damping an alpair 7P /12PW cabinet?

Hello everyone,

Now that my A7P/A12PW combination is slowly coming together, it is time to shop for cabinet damping material. I have a specific material in mind, a plate made of polyester wool, which is this:

http://www.merford.com/media/191560/akotherm-basic.pdf

The datasheet is in Dutch, but the absorption versus frequency chart should be easy to find. I am looking at the D40 (40 kilograms per cubic meter) variant, in the thicknesses 20 and 50 mm. Of all the absorption materials that have their absorption coefficient specified in a datasheet, this particular material seems to beat all others in the low- to mid frequency range at a given material thickness. Egg-crate and pyramid foams don't even seem to come close. The stuff that is sold at loudspeaker component shops has lower density, and thus probably poorer LF and MF absorption, but I have so far not been able to find meaningful data on any of those materials.

So I think I have found a promising material to damp a vented cabinet for an Alpair 12PW and a closed cabinet for an Alpair 7P. Or am I missing something?

Thanks for any input.
  Reply With Quote
Old 25th March 2015, 03:58 PM   #2
planet10 is online now planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Is this material suitable for damping an alpair 7P /12PW cabinet?
Looks like it should be fine.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 21st May 2015, 05:16 PM   #3
IZHAKKATZ is offline IZHAKKATZ  Israel
diyAudio Member
 
Join Date: Jul 2004
Location: Israel
I'm about to finish my A10M Pensil Cab. (this is my first speaker project) and I'm also looking for materials to aline top half of cab walls.
Will thin sheets of cork be effective?

Thanks,
IK
  Reply With Quote
Old 21st May 2015, 05:30 PM   #4
planet10 is online now planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Is this material suitable for damping an alpair 7P /12PW cabinet?
Cork will only steal space, it will not supply much acoustic damping.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 21st May 2015, 07:46 PM   #5
sreten is offline sreten  United Kingdom
R.I.P.
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

There is maximum density of the stuff that lines speakers
that if you exceed it, it reduces effective internal volume.

From a translated page the D20 version is recommended for speakers.
40mm of D20 is better than 20mm of D40.

Makes sense for lining a vented cabinet. For sealed simply stuff
with polyester stuffing, vary the density, optimum is when the
minimum Fbox is indicated on the impedance trace.

rgds, sreten.

For small sealed boxes about 2.0 lb/cuft of polyfill should work.
The bigger the box the lower the optimum stuffing density.

Last edited by sreten; 21st May 2015 at 07:59 PM.
  Reply With Quote
Old 23rd May 2015, 05:28 AM   #6
zman01 is offline zman01  Bangladesh
diyAudio Member
 
Join Date: Feb 2011
Location: Dhaka
Is this material suitable for damping an alpair 7P /12PW cabinet?
ISHAKKATZ,

Is jute felt available at your place?

Any carpet underlay?

Make sure you build a removable back for your Pensil cab - you can take the poly-fluff stuffing in and out easily that way.
  Reply With Quote

Reply


Is this material suitable for damping an alpair 7P /12PW cabinet?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Alpair 7P & Alpair 12PW combination. markaudio Planet 10 hifi 324 14th October 2016 06:44 AM
req. suitable cabinet for Alpair 7p sarathssca Full Range 13 17th January 2015 05:24 PM
req. suitable amplifier for Alpair 7p sarathssca Full Range 17 20th November 2014 03:29 AM
Quantity of damping material in cabinet icsohn94 Multi-Way 12 16th July 2014 06:34 PM
Use of Lead (Pb) as damping material in loudspeaker cabinet nannoo Construction Tips 8 12th January 2014 06:45 AM


New To Site? Need Help?

All times are GMT. The time now is 12:03 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki