Mounting a driver in the bottom of an enlcosure okay?

Boscoe · 26th September 2010, 10:48 AM

Due to length of my port I can't fit the driver I have designed the enlcosure in the front, will it be okay in the bottom?

Cal Weldon · 26th September 2010, 04:19 PM

It depends on the motor and cone mass. Too heavy and she sags causing permanent damage. See if you can search here or on Google, there's info somewhere on that. Either that or you rotate your cabinet so the bottom is now the side.

Boscoe · 26th September 2010, 06:34 PM

So what is ideal THIS is a link to the driver.

Cal Weldon · 26th September 2010, 06:49 PM

See what you can find here:

down firing woofer cone mass - Google Search

richie00boy · 26th September 2010, 06:58 PM

Alternatively put a bend in the port?

Boscoe · 26th September 2010, 08:15 PM

Quote:

See what you can find here:

down firing woofer cone mass - Google Search

Didn't really find anything is there a way of just finding out a definative answer?

Quote:

Alternatively put a bend in the port?

I can't really it's 4" OD!

Cal Weldon · 26th September 2010, 08:37 PM

Definitive answer? No, it's going to be a compromise when you go against the physics and driver design considerations (no unit is better downfiring). That being said, if it's a dual coil with only 68 gr. moving mass and an Xmax of 4 mm then you're likely to have better results than most woofers. The sag will take longer to happen and will not be as extreme but the reason I pointed you to the google search is that this is a diy site and I was trying to stimulate a bit of the diy part. You should be fine. Now can you shows us a quick sketch of what you are doing and show us why you can't make the bottom of the box, the side? ie: rotate the cabinet.

Cal Weldon · 26th September 2010, 08:46 PM

I notice the driver has a low Qms. That might mean a little more sag and bit more muddy of a sound but unless someone who knows more than me steps in, I would say go ahead.

Boscoe · 26th September 2010, 08:49 PM

Yeh here, the circle is where the driver would go but theres not enough room and the reason why I didn't want to rotate it is because the strongest side is at the bottom where the panel sits on top of the others. the box measures 400mm cubed which is 46l, the breath hole is 98mm diameter ID and is 300mm long.

GM · 26th September 2010, 09:20 PM

Depends: http://www.adireaudio.com/Files/DriverOrientation.pdf

GM

26th September 2010, 10:48 AM	#1
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Mounting a driver in the bottom of an enlcosure okay? Due to length of my port I can't fit the driver I have designed the enlcosure in the front, will it be okay in the bottom?

26th September 2010, 04:19 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	It depends on the motor and cone mass. Too heavy and she sags causing permanent damage. See if you can search here or on Google, there's info somewhere on that. Either that or you rotate your cabinet so the bottom is now the side. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

26th September 2010, 06:49 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	See what you can find here: down firing woofer cone mass - Google Search __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

26th September 2010, 06:58 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Alternatively put a bend in the port? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

26th September 2010, 08:37 PM	#7
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Definitive answer? No, it's going to be a compromise when you go against the physics and driver design considerations (no unit is better downfiring). That being said, if it's a dual coil with only 68 gr. moving mass and an Xmax of 4 mm then you're likely to have better results than most woofers. The sag will take longer to happen and will not be as extreme but the reason I pointed you to the google search is that this is a diy site and I was trying to stimulate a bit of the diy part. You should be fine. Now can you shows us a quick sketch of what you are doing and show us why you can't make the bottom of the box, the side? ie: rotate the cabinet. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting


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26th September 2010, 06:34 PM	#3
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	So what is ideal THIS is a link to the driver.

26th September 2010, 08:46 PM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I notice the driver has a low Qms. That might mean a little more sag and bit more muddy of a sound but unless someone who knows more than me steps in, I would say go ahead. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

26th September 2010, 08:49 PM	#9
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Yeh here, the circle is where the driver would go but theres not enough room and the reason why I didn't want to rotate it is because the strongest side is at the bottom where the panel sits on top of the others. the box measures 400mm cubed which is 46l, the breath hole is 98mm diameter ID and is 300mm long.

26th September 2010, 09:20 PM	#10
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Mounting a driver in the bottom of an enlcosure okay? Depends: http://www.adireaudio.com/Files/DriverOrientation.pdf GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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