Fast and simple question

rinx · 5th November 2007, 04:47 AM

And now I have some things to accurate. SW manual suggest

o not place the damping material directly behind the woofer/midrange unit or close to the port internal opening, as this will over-damp the bass and give a dull sound.
I have 2 questions about it to make its sure that I undestand it right.

1.So I will leave wall excactly behind the woofer free from damping material (f.e. 8" circle). And this is the enclosure wall against to the wall where woofer is mounted?!
2.About port:So i should leave place free from damping material place where port is mounted with wall or where it is opening (close to anoother wall). Simple questionas, but it would be necessery to understand thouse rules

Thank You,

R>R

planet10 · 5th November 2007, 04:51 AM

I think they mean no damping directly behind the woofer... damping on the wall behind the woofer, is IMO, one of the more important places to putt damping.

And no damping near the inside opening of the port.

dave

MaVo · 5th November 2007, 07:49 PM

considering the wavelength of the soundwaves in the bass area in comparison to the enclosure size, i would argue that it is rather unimportant where you place the damping material. perhaps not in or in front of the port of a br box, since you would reduce its effect, making the box more a closed one. perhaps not directly behind the woofer, since the stuffing could move with the pressure (linkwitz considered this in his thor sub, i think).

could someone explain the concept of "over-damp the bass and give a dull sound" to me? i thought when something sounds "dull" (whatever that may sound like) the problem lies in the mid frequecies. so what is an overdamped bass?

rinx · 6th November 2007, 05:57 AM

I have done some picture about it. So should not to put damping material to area 2.

http://www.album.ee/node/11641796/50044117

Correct?!

BHTX · 6th November 2007, 06:14 AM

lol...you're kidding, right?

BHTX · 6th November 2007, 06:32 AM

Hope this helps..

edit: Also, disregard the fact that my crude and effortless diagram includes a port and mentions stuffing. With a vented system, you'd normally want to use foam or something else besides acousta-stuff. Just...try not to cramb it up directly behind the driver, and don't get it around the opening of the port, and you'll be fine. Focus on the top/bottom, sides, and back wall...especially on the back wall.

BHTX · 6th November 2007, 07:18 AM

Like this..

rinx · 6th November 2007, 08:04 AM

Thank you! One small tip again.

...behind means behind

its like a joke I soo in America:

STOP means STOP (in traffic)

In Europe its just funny to think, but thats why I like US.

5th November 2007, 04:47 AM	#1
rinx diyAudio Member Join Date: Sep 2007	Fast and simple question And now I have some things to accurate. SW manual suggesto not place the damping material directly behind the woofer/midrange unit or close to the port internal opening, as this will over-damp the bass and give a dull sound. I have 2 questions about it to make its sure that I undestand it right. 1.So I will leave wall excactly behind the woofer free from damping material (f.e. 8" circle). And this is the enclosure wall against to the wall where woofer is mounted?! 2.About port:So i should leave place free from damping material place where port is mounted with wall or where it is opening (close to anoother wall). Simple questionas, but it would be necessery to understand thouse rules Thank You, R>R

5th November 2007, 04:51 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I think they mean no damping directly behind the woofer... damping on the wall behind the woofer, is IMO, one of the more important places to putt damping. And no damping near the inside opening of the port. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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5th November 2007, 07:49 PM	#3
MaVo diyAudio Member Join Date: Jan 2006 Location: Herne	considering the wavelength of the soundwaves in the bass area in comparison to the enclosure size, i would argue that it is rather unimportant where you place the damping material. perhaps not in or in front of the port of a br box, since you would reduce its effect, making the box more a closed one. perhaps not directly behind the woofer, since the stuffing could move with the pressure (linkwitz considered this in his thor sub, i think). could someone explain the concept of "over-damp the bass and give a dull sound" to me? i thought when something sounds "dull" (whatever that may sound like) the problem lies in the mid frequecies. so what is an overdamped bass?

6th November 2007, 05:57 AM	#4
rinx diyAudio Member Join Date: Sep 2007	I have done some picture about it. So should not to put damping material to area 2. http://www.album.ee/node/11641796/50044117 Correct?!

6th November 2007, 06:14 AM	#5
BHTX diyAudio Member Join Date: Feb 2006	lol...you're kidding, right?

6th November 2007, 08:04 AM	#8
rinx diyAudio Member Join Date: Sep 2007	Thank you! One small tip again. ...behind means behind its like a joke I soo in America: STOP means STOP (in traffic) In Europe its just funny to think, but thats why I like US.

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