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Old 29th December 2017, 10:20 PM   #11
globalplayer is offline globalplayer  Germany
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So basically I get the output of one woofer by using 2 and a smaller enclosure?
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Old 29th December 2017, 10:27 PM   #12
scottjoplin is offline scottjoplin  Wales
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In a nutshell , half the size enclosure than one driver, the most space saving way is "clamshell" (more shells please )
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Old 29th December 2017, 10:32 PM   #13
globalplayer is offline globalplayer  Germany
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"Clamshell" is what I would have done, cone to cone.
But now...
it is a waste of resources (2nd woofer) I think.
I was hoping for more advantages than just a smaller enclosure.
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Old 29th December 2017, 10:35 PM   #14
scottjoplin is offline scottjoplin  Wales
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Yes, I think so too, and this does seem to be the modern consensus, perhaps when drivers weren't as good the cancellation of non linearities was a bigger advantage. Also with a clamshell it's the back of the cone that you hear.....doesn't seem right
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Old 29th December 2017, 11:21 PM   #15
Joshcpct is offline Joshcpct  Germany
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Hi all. A friend of mine tested it. The cancellation only affects even harmonics.
It can be up to 20dB lower which is magnificent.
But, as u noted, poor efficiency. Using both for output, cuts excursions half and reduces uneven harmonics. At the end both outputting was better.
But here’s the thing:
You can still use isobaric advantages & principle while doubling efficiency at the same time.
Simply turn one woofer outwards and one backwards installed, separate from each other, both outputting, and connect out of phase. That also causes both producing even harmonics out of phase to each other while the input signal is played in phase.

The only drawback is the 2 different positions (distance between both membranes) are not canceling out so much. But its still 10dB. Cuts distortion to third of percentage. Better than nothing. If you manage to get them even closer (like in an ripole alike slot) you still get the 20dB, AND your smaller enclosure / or deeper Fs due to slot airmass load). Im only refering to the frontslot of ripole. Coz running the back open will obviously skyrocket the excursion and distortion even worse so keep the back closed (or Reflex, Horn whatever).

As you can assume this is only nice for subs.
But im currently planning some tests for midrange on horndrivers.

Cheers
Josh

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Old 29th December 2017, 11:28 PM   #16
globalplayer is offline globalplayer  Germany
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Interesting.
Thanks for the info.
I would put them in a 6th order bp.
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Old 29th December 2017, 11:42 PM   #17
scottjoplin is offline scottjoplin  Wales
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wilson benesch speakers - chimera wilson benesch 0a - Hifishock
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Old 30th December 2017, 12:26 AM   #18
scottjoplin is offline scottjoplin  Wales
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Josh, I think I understand what you are saying, but if I'm right, there are no isobaric principles involved in that set up, some distortion cancellation yes.
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Old 30th December 2017, 01:00 AM   #19
GM is offline GM  United States
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Specs say [2] isobaric bass units: http://wilson-benesch.com/downloads/...nge_Manual.pdf

GM
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Old 3rd January 2018, 06:37 AM   #20
MemX is offline MemX  United Kingdom
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Quote:
Originally Posted by Joshcpct View Post
Hi all. A friend of mine tested it. The cancellation only affects even harmonics.
It can be up to 20dB lower which is magnificent.
But, as u noted, poor efficiency. Using both for output, cuts excursions half and reduces uneven harmonics. At the end both outputting was better.
But here’s the thing:
You can still use isobaric advantages & principle while doubling efficiency at the same time.
Simply turn one woofer outwards and one backwards installed, separate from each other, both outputting, and connect out of phase. That also causes both producing even harmonics out of phase to each other while the input signal is played in phase.

The only drawback is the 2 different positions (distance between both membranes) are not canceling out so much. But its still 10dB. Cuts distortion to third of percentage. Better than nothing. If you manage to get them even closer (like in an ripole alike slot) you still get the 20dB, AND your smaller enclosure / or deeper Fs due to slot airmass load). Im only refering to the frontslot of ripole. Coz running the back open will obviously skyrocket the excursion and distortion even worse so keep the back closed (or Reflex, Horn whatever).

As you can assume this is only nice for subs.
But im currently planning some tests for midrange on horndrivers.

Cheers
Josh
Quote:
Originally Posted by scottjoplin View Post
Josh, I think I understand what you are saying, but if I'm right, there are no isobaric principles involved in that set up, some distortion cancellation yes.
Is that a PPSL?
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