Placement of PR on a sub box

Stantob · 16th January 2006, 06:57 PM

I am planning to build a sub with the classic Peerless XLS and a passive radiator. PR is new to me and I have searched the net to learn. But one thing remains unsolved to me. I have seen solutions where the passive element is facing all directions.
Doesn't this have any influence on the construction? Phase problems? I want to place the PR on the same side as the main element, pointing downwards.
Does the distance between the elements have any importance?
Thanks!

simon5 · 16th January 2006, 07:05 PM

A passive radiator is usually VERY heavy so pointing downwards is usually a very BAD idea.

If you crossover low, the PR can be anywhere, even behind.

Stantob · 16th January 2006, 08:14 PM

Didn’t think of that! Is it the same problem with XLS drive element pointing down? A solution could be using a vented system. A long vent should not be a problem in my design.

simon5 · 16th January 2006, 08:26 PM

You can have the XLS pointing down if you have less than 5% of sag.

It's mostly a problem with PRs, but some drivers can't achieve less than 5% of sag too.

You can't use a frontfiring PR?

Stantob · 16th January 2006, 09:36 PM

It is more of an aesthetical problem. I want the speaker to be "invisible". Two 12" elements poining at your fase is not.

simon5 · 16th January 2006, 10:21 PM

But the woofer under and the PR behind, as long as you doesn't put the subwoofer too close to a wall it will be ok.

16th January 2006, 06:57 PM	#1
Stantob diyAudio Member Join Date: Jan 2006 Location: Sweden	Placement of PR on a sub box I am planning to build a sub with the classic Peerless XLS and a passive radiator. PR is new to me and I have searched the net to learn. But one thing remains unsolved to me. I have seen solutions where the passive element is facing all directions. Doesn't this have any influence on the construction? Phase problems? I want to place the PR on the same side as the main element, pointing downwards. Does the distance between the elements have any importance? Thanks!

16th January 2006, 07:05 PM	#2
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	A passive radiator is usually VERY heavy so pointing downwards is usually a very BAD idea. If you crossover low, the PR can be anywhere, even behind. __________________ DIYaudio for President !

16th January 2006, 08:26 PM	#4
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	You can have the XLS pointing down if you have less than 5% of sag. It's mostly a problem with PRs, but some drivers can't achieve less than 5% of sag too. You can't use a frontfiring PR? __________________ DIYaudio for President !

16th January 2006, 10:21 PM	#6
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	But the woofer under and the PR behind, as long as you doesn't put the subwoofer too close to a wall it will be ok. __________________ DIYaudio for President !

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16th January 2006, 08:14 PM	#3
Stantob diyAudio Member Join Date: Jan 2006 Location: Sweden	Didn’t think of that! Is it the same problem with XLS drive element pointing down? A solution could be using a vented system. A long vent should not be a problem in my design.

16th January 2006, 09:36 PM	#5
Stantob diyAudio Member Join Date: Jan 2006 Location: Sweden	It is more of an aesthetical problem. I want the speaker to be "invisible". Two 12" elements poining at your fase is not.

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