back chamber (Oris Horns)

by fu_man @, Friday, May 25, 2007, 05:25 (3897 days ago)

A guy I know has horns similar to 150's with Lowther Pm2a's ( i think) and likes them open at the back I.E. no back chamber. Has anyone tried this? What does the back chamber provide?
My play with open baffles speakers revealed a more open and free sound compared to similar cost box speakers. Less colouration. I have enjoyed electrostatic speakers so maybe the flavour of dipole speakers is to my liking.

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back chamber

by Bert @, Friday, May 25, 2007, 09:25 (3897 days ago) @ fu_man

A guy I know has horns similar to 150's with Lowther Pm2a's ( i think) and
likes them open at the back I.E. no back chamber. Has anyone tried
this? What does the back chamber provide?

It privides proper loading of the horn (no cancellation). Without the back chamber or fully open will give a dip around 200Hz making its respons less effective down to 150Hz. Advantage is more "freedom" and less "closed-in" sound...

Bert

--
BD-Design - Only the Best!

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back chamber

by fu_man @, Friday, May 25, 2007, 10:07 (3897 days ago) @ Bert

thanks...
is there anything you don't know? :clever:

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back chamber

by Bert @, Friday, May 25, 2007, 12:40 (3897 days ago) @ fu_man

is there anything you don't know? :clever:

Still learning every day... :yes:

--
BD-Design - Only the Best!

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Dip

by mats @, Saturday, May 26, 2007, 00:24 (3897 days ago) @ Bert

"Without the back chamber or fully open will give a dip around 200Hz making its respons less effective down to 150Hz. Advantage is more "freedom" and less "closed-in" sound..."

So, what some call "Open Sound" is nothing more than a dip, in this case around 200Hz. And reality is "closed-in". I'll take the disadvantage!

Mats

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Dip

by Bert @, Saturday, May 26, 2007, 16:13 (3896 days ago) @ mats

Hi Mats,

So, what some call "Open Sound" is nothing more than a dip, in this case
around 200Hz. And reality is "closed-in". I'll take the disadvantage!

Not just that, less pressure behind the drivers with a rather thin and weak diaphragm makes them sound "cleaner" too..

Bert

--
BD-Design - Only the Best!

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back chamber

by Cappy @, Friday, May 25, 2007, 17:37 (3897 days ago) @ fu_man

I found leaving the back chambers off mucked up the imaging.

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back chamber

by fu_man @, Monday, May 28, 2007, 05:04 (3894 days ago) @ Cappy

thanks,
I think i will make a slide over cover so I can try with and without, and can play around with the volume a bit.

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I have mine that way...

by joel @, Wednesday, June 06, 2007, 21:30 (3885 days ago) @ fu_man

With Lowther ticonal pm6as in 'em. I've got my 150s in the ceiling corners of my room, which perhaps fills in below 200 HZ since they're working in 1/8-space. The arrangement seems to work OK for me. Cheers!

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