Dipoles ? - Page 11

el`Ol · 12th February 2006, 05:30 AM

The Dayton RS12 are much closer to Peerless XLS or Visaton TIW from their specs than to classic OB drivers. These two have about 2-3 times the excursion, but maybe the conceps without baffle will equally work (low sensitivity, active crossover).

PS:
I asked Tymphany about dipoles some months ago. They say the LAT will also work without baffle (and with low excursion). But here the large moving mass limits sensitivity.

mac · 12th February 2006, 07:26 AM

Quote:

Originally posted by AJinFLA
Is group delay something that happens when the train is late? ...

I have to laugh.

AJinFLA · 12th February 2006, 01:35 PM

Quote:

Because of Qts "fight" - I dunno if anyone is still interested in my "Orion for miser" project, but I decided [finally!] what speakers I'm gonna use:
- Seas 27TBFC/G [H1212]
- Seas L22RNX/P [H1252]
- 2xPeerless SLS 12

Lenny, those are excellent choices for an "Oriomiser". Like every loudspeaker system , it is now up to the builder to get the implementation of those drive units: cabinet, crossover,etc. - correctly, to make the design a successful one.
Good luck.

Cheers,

AJ

el`Ol · 13th February 2006, 09:50 AM

Quote:

Originally posted by tade
I am considering putting my dayton rs 12" subs in either u baffles or really nice sealed boxes.

Can you give me some info as to how to think about u baffles? Things like power and frequency response. Maybe a website or something? I am having trouble finding info.

Hello Tade!

This is what I would do with the Eminence (if I had the space):
Height above the driver min. 105, everything in centimeters.

If you mean the Vas 3ft^3 Qts 0.44 version you could try it.

Good luck!

Numbers in the graphics are not readable: 50, 70, 120

tade · 13th February 2006, 10:19 PM

el`Ol, thank you for the brain power!

What would happen if I omitted the front two wings? Would that put the cancellation null farther back and thus put the listener nearer field?

Anyway, I believe that the size constraints will win over bass goodness. I am looking at building a box 14" by 10" by 30". So, a little more compact! : )

I am getting pretty good at building sealed boxes but ill take any advice you can give me.

el`Ol · 14th February 2006, 03:00 AM

Hello Tade! The front wings enhance the acoustic short circuit without making the construction much bigger. I read in a German forum that somebody did this with success.

regards,
Oliver

ALF in AUS · 14th February 2006, 07:17 AM

So el'OL this then becomes similar to a H frame dipole, but without the top piece?
As I see it that would probably give a more open dipole sound than the conventional H frame ... or am I barking up the wrong tree?

Cheers
ALF

el`Ol · 14th February 2006, 05:15 PM

Hello Alf!

Since OB bass is more directional than conventional bass the front wings shouldn`t be a problem. Wings on the top should also be no problem.

http://www.auditorium23.de/PHY/Plaene2.html

tade · 14th February 2006, 05:20 PM

now, would the front baffles muddy up midbass, about 500hz? I know you can lightly stuff the rear of the baffle, but the front is there for you to hear...
: )

el`Ol · 15th February 2006, 06:17 AM

Hello Tade!

If you have the space for two such monsters you can calculate the effect of the conic horn at higher frequencies with Hornresp or others.

One off-topic question, since you are experienced with sealed encosures:
How important is it that a sealed enclosure is really sealed when high-Vas woofers are used (Peerless SLS 12 in my case)?

Regards, Oliver

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12th February 2006, 05:30 AM	#101
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	The Dayton RS12 are much closer to Peerless XLS or Visaton TIW from their specs than to classic OB drivers. These two have about 2-3 times the excursion, but maybe the conceps without baffle will equally work (low sensitivity, active crossover). PS: I asked Tymphany about dipoles some months ago. They say the LAT will also work without baffle (and with low excursion). But here the large moving mass limits sensitivity.

13th February 2006, 10:19 PM	#105
tade diyAudio Member Join Date: Feb 2005 Location: Ralieigh nc	el`Ol, thank you for the brain power! What would happen if I omitted the front two wings? Would that put the cancellation null farther back and thus put the listener nearer field? Anyway, I believe that the size constraints will win over bass goodness. I am looking at building a box 14" by 10" by 30". So, a little more compact! : ) I am getting pretty good at building sealed boxes but ill take any advice you can give me.

14th February 2006, 03:00 AM	#106
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Hello Tade! The front wings enhance the acoustic short circuit without making the construction much bigger. I read in a German forum that somebody did this with success. regards, Oliver

14th February 2006, 07:17 AM	#107
ALF in AUS diyAudio Member Join Date: Nov 2004 Location: Melbourne Australia	So el'OL this then becomes similar to a H frame dipole, but without the top piece? As I see it that would probably give a more open dipole sound than the conventional H frame ... or am I barking up the wrong tree? Cheers ALF

14th February 2006, 05:15 PM	#108
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Hello Alf! Since OB bass is more directional than conventional bass the front wings shouldn`t be a problem. Wings on the top should also be no problem. http://www.auditorium23.de/PHY/Plaene2.html

14th February 2006, 05:20 PM	#109
tade diyAudio Member Join Date: Feb 2005 Location: Ralieigh nc	now, would the front baffles muddy up midbass, about 500hz? I know you can lightly stuff the rear of the baffle, but the front is there for you to hear... : )

15th February 2006, 06:17 AM	#110
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Hello Tade! If you have the space for two such monsters you can calculate the effect of the conic horn at higher frequencies with Hornresp or others. One off-topic question, since you are experienced with sealed encosures: How important is it that a sealed enclosure is really sealed when high-Vas woofers are used (Peerless SLS 12 in my case)? Regards, Oliver

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