Question about compund driver placement

GhettoSQ · 7th June 2006, 10:10 PM

This may be a dumb question, but right now I have 2 drivers mounted clamshell in a vented box. Sounds great but for cosmetics I'd like to make feet and put one driver underneath. The port is 4"x16", so I'm wondering if firing the bottom driver right up at the port will interfere with the air flow? thanks in advance.

Cal Weldon · 7th June 2006, 11:45 PM

It's probably alright but can you post a sketch?

GhettoSQ · 8th June 2006, 10:35 AM

Having trouble inserting images...here's what it looks like now.

GhettoSQ · 8th June 2006, 10:36 AM

Here's what I want to do:

richie00boy · 8th June 2006, 11:07 AM

No that won't work as you lose the compound effect of the drivers. The original design seems fine to me, the port being close to the drivers is not an issue.

hooha · 8th June 2006, 12:18 PM

Richie, I'm not sure I follow you on this. Can you explain how he would lose the "compound effect" by mounting the driver in the same way as his first design with the same wiring config?

Mark

richie00boy · 8th June 2006, 12:38 PM

Simple:

- look at how much cone area facing the outside world there is in case 1 vs case 2.
- look at how physically close the coupling is between the cones in case 1 vs case 2

hooha · 8th June 2006, 02:00 PM

So if this isn't a compound design (read push-pull) as per other reference and commercial sites such as this one , what then would you call it?

Mark

richie00boy · 8th June 2006, 02:20 PM

I had always referred to what that site calls isobarik as compound (although I was aware that isobarik was another name for it), which is not the same as push-pull.

Could be getting rusty on terminology lol. Loudspeaker Design Cookbook is my bible so I'll check in there.

Basically the original poster will be losing out on the box size halving aspect if he goes with design 2.

hooha · 8th June 2006, 02:35 PM

Yea, I hear ya. I'm often faced with the same issue(s)

Most definately, by moving the driver as such the OP would have to rebuild his enclosure to compensate for the doubling Vas.

Getto, how about placing the feet on the side the drivers are mounted and standing it upright? One can do wonders with a bit of grill cloth.

If it sounds good to you now, there's no point in changing it...

Mark

7th June 2006, 10:10 PM	#1
GhettoSQ diyAudio Member Join Date: Feb 2005 Location: Boston, MA	Question about compund driver placement This may be a dumb question, but right now I have 2 drivers mounted clamshell in a vented box. Sounds great but for cosmetics I'd like to make feet and put one driver underneath. The port is 4"x16", so I'm wondering if firing the bottom driver right up at the port will interfere with the air flow? thanks in advance. __________________ GhettoSQ Somewhere between Craft and Kraft

7th June 2006, 11:45 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	It's probably alright but can you post a sketch? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

8th June 2006, 11:07 AM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	No that won't work as you lose the compound effect of the drivers. The original design seems fine to me, the port being close to the drivers is not an issue. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

8th June 2006, 12:18 PM	#6
hooha diyAudio Member Join Date: Apr 2005 Location: Winnipeg, Manitoba	Richie, I'm not sure I follow you on this. Can you explain how he would lose the "compound effect" by mounting the driver in the same way as his first design with the same wiring config? Mark __________________ Breaking speed records - http://www.mach5audio.com

8th June 2006, 12:38 PM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Simple: - look at how much cone area facing the outside world there is in case 1 vs case 2. - look at how physically close the coupling is between the cones in case 1 vs case 2 __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

8th June 2006, 02:00 PM	#8
hooha diyAudio Member Join Date: Apr 2005 Location: Winnipeg, Manitoba	So if this isn't a compound design (read push-pull) as per other reference and commercial sites such as this one , what then would you call it? Mark __________________ Breaking speed records - http://www.mach5audio.com

8th June 2006, 02:20 PM	#9
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I had always referred to what that site calls isobarik as compound (although I was aware that isobarik was another name for it), which is not the same as push-pull. Could be getting rusty on terminology lol. Loudspeaker Design Cookbook is my bible so I'll check in there. Basically the original poster will be losing out on the box size halving aspect if he goes with design 2. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

8th June 2006, 02:35 PM	#10
hooha diyAudio Member Join Date: Apr 2005 Location: Winnipeg, Manitoba	Yea, I hear ya. I'm often faced with the same issue(s) Most definately, by moving the driver as such the OP would have to rebuild his enclosure to compensate for the doubling Vas. Getto, how about placing the feet on the side the drivers are mounted and standing it upright? One can do wonders with a bit of grill cloth. If it sounds good to you now, there's no point in changing it... Mark __________________ Breaking speed records - http://www.mach5audio.com

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
driver placement	speedie	Multi-Way	4	9th August 2009 04:22 AM
Driver Placement on baffle	56oval	Multi-Way	2	26th July 2009 05:25 PM
BIB DRIVER PLACEMENT n' others	herpaw	Full Range	18	27th December 2006 08:53 AM
Dimensions and driver placement	Tai-Pan	Multi-Way	5	16th December 2002 04:49 PM
Driver placement	Vivek	Multi-Way	8	12th April 2002 07:58 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read