12nda 520

GregOH1 · 18th May 2007, 04:09 PM

I purchased the 12nda 520 for a variation of Lynns project , The speaker has two seperate connections , at this time neither 18 Sound in the U.S. or Loudspeakerplus new why. Rafael at 18 Sound is contacting the factory for answers. Any ideas? The project will have Radian 1.4 (745pb) CD driver mounted on a hand lathed 11.5 in. cherry Horn ,1200hz( I used the PE conical waveguide as a templete) the 12nda 520 for the widerange and one Eminence Delta Pro 15 for the bottom. The 2x4 Panels are Baltic Birch venered with Quilted Makore . Panals are veneered and The Horns are completed with pictures to be posted soon.

Paul W · 18th May 2007, 04:26 PM

The second set of connections is for the 18Sound "Active Impedance Compensation" technology. Dunno why they brought the leads out separately, but that does allow comparisons with/without AIC.

ScottG · 19th May 2007, 02:40 AM

..wire them in parallel to achieve "active impedance".

As I'm sure Paul will confirm, make sure that both open baffles are heavily weighted to keep the drivers (..and the entire loudspeaker) from moving around..

Paul W · 19th May 2007, 11:15 AM

Yup to both

Really looking forward to seeing your horn pictures. A large DIY CD waveguide is only one project further down my list!

18th May 2007, 04:09 PM	#1
GregOH1 diyAudio Member Join Date: May 2006 Location: columbus	12nda 520 I purchased the 12nda 520 for a variation of Lynns project , The speaker has two seperate connections , at this time neither 18 Sound in the U.S. or Loudspeakerplus new why. Rafael at 18 Sound is contacting the factory for answers. Any ideas? The project will have Radian 1.4 (745pb) CD driver mounted on a hand lathed 11.5 in. cherry Horn ,1200hz( I used the PE conical waveguide as a templete) the 12nda 520 for the widerange and one Eminence Delta Pro 15 for the bottom. The 2x4 Panels are Baltic Birch venered with Quilted Makore . Panals are veneered and The Horns are completed with pictures to be posted soon.

19th May 2007, 02:40 AM	#3
ScottG diyAudio Member Join Date: Feb 2003 Location: US	..wire them in parallel to achieve "active impedance". As I'm sure Paul will confirm, make sure that both open baffles are heavily weighted to keep the drivers (..and the entire loudspeaker) from moving around.. __________________ perspective is everything

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18th May 2007, 04:26 PM	#2
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	The second set of connections is for the 18Sound "Active Impedance Compensation" technology. Dunno why they brought the leads out separately, but that does allow comparisons with/without AIC.

19th May 2007, 11:15 AM	#4
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	Yup to both Really looking forward to seeing your horn pictures. A large DIY CD waveguide is only one project further down my list!

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