Granite Front Baffles

moses · 11th February 2004, 11:58 PM

I'm looking at making some Jordan JX92 enclosures in the next few months here with a 1 1/4" granite front baffle. I was curious of whether I should just flush mount the driver or leave a set on contentric rings surrounding the driver. While I can't do that 45 degree cut like on the Pass Labs Rushmore speakers, but I could do a number of contentric circles creating a simliar effect, but I'm not sure which would be best "sound wise".

jlm0924 · 12th February 2004, 12:20 AM

what-ever gives the smoothest transition from spkr to baffle, - flush mount it

Roscoe Primrose · 12th February 2004, 01:38 AM

Don't ask me to help you move them!

Peace

454Casull · 12th February 2004, 02:09 AM

I would suggest a flush mount.

LineSource · 12th February 2004, 04:04 AM

Hi Moses,

A 1.25" thick baffle with cover up a large amount of the side perimeter of the cone, causing reflections to the back of the cone which you will hear.

Have you considered surface mountng to a stronger baffle material like 0.5" Aluminum?

From my experience, any front baffle obstruction or waveguide creates frequency fluctuations from diffraction and also reduces the width of the sweet spot.

Wright · 12th February 2004, 12:46 PM

He's right about the baffle causing problems with the rear of the driver. I would at least baffle or scallop the rear of the driver opening to improve air flow. And I recommend flush mounting.
It's a neat idea, how are you machining the granite?

moses · 12th February 2004, 03:18 PM

Then flush mount it is. I'll see about making a series of cuts behind the driver to allow for better airflow. As for cutting I'll have the granite guys next door cut it to size, the opening for driver I'll make with a custom made jig and a 4" angle grinder with a diamond blade. Not having the contentric circles on front does save me a lot of polishing time which is good thing.

Variac · 12th February 2004, 05:59 PM

yeah, concentric rings would be the worst..

11th February 2004, 11:58 PM	#1
moses diyAudio Member Join Date: Aug 2002 Location: Aberdeen, SD	Granite Front Baffles I'm looking at making some Jordan JX92 enclosures in the next few months here with a 1 1/4" granite front baffle. I was curious of whether I should just flush mount the driver or leave a set on contentric rings surrounding the driver. While I can't do that 45 degree cut like on the Pass Labs Rushmore speakers, but I could do a number of contentric circles creating a simliar effect, but I'm not sure which would be best "sound wise".

12th February 2004, 04:04 AM	#5
LineSource diyAudio Member Join Date: Sep 2003 Location: SiliconValley	0.5" Aluminum Hi Moses, A 1.25" thick baffle with cover up a large amount of the side perimeter of the cone, causing reflections to the back of the cone which you will hear. Have you considered surface mountng to a stronger baffle material like 0.5" Aluminum? From my experience, any front baffle obstruction or waveguide creates frequency fluctuations from diffraction and also reduces the width of the sweet spot.

12th February 2004, 05:59 PM	#8
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	yeah, concentric rings would be the worst.. __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

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12th February 2004, 12:20 AM	#2
jlm0924 diyAudio Member Join Date: Feb 2004 Location: sadf	what-ever gives the smoothest transition from spkr to baffle, - flush mount it

12th February 2004, 01:38 AM	#3
Roscoe Primrose Do you smell smoke? diyAudio Member Join Date: Jan 2004 Location: Virginia, USA	Don't ask me to help you move them! Peace

12th February 2004, 02:09 AM	#4
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	I would suggest a flush mount.

12th February 2004, 12:46 PM	#6
Wright diyAudio Member Join Date: Apr 2003 Location: Seattle, WA	He's right about the baffle causing problems with the rear of the driver. I would at least baffle or scallop the rear of the driver opening to improve air flow. And I recommend flush mounting. It's a neat idea, how are you machining the granite?

12th February 2004, 03:18 PM	#7
moses diyAudio Member Join Date: Aug 2002 Location: Aberdeen, SD	Then flush mount it is. I'll see about making a series of cuts behind the driver to allow for better airflow. As for cutting I'll have the granite guys next door cut it to size, the opening for driver I'll make with a custom made jig and a 4" angle grinder with a diamond blade. Not having the contentric circles on front does save me a lot of polishing time which is good thing.

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