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Subwoofer Placement and Pointing


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bigred948 
Member - Posts: 8
Member spacespace
Joined: December 28, 2006
Posted: December 29, 2006 at 12:09 PM / IP Logged  

Hey everyone.  After much lurking, this is my first post. 

I've done a ton of searching about subwoofer installs.  I've read the article on installer.com as well as about 100 posts asking "How should I point my subwoofers?"  My question is a little more involved than what I've found.

I'm currently in the planning stages for my first fiberglass enclosure build.  The enclosure will house a single 10" sub.  I am going for a functional and space saving design.  Asthetics or "showing off my goods" is not a priority.  This is to be installed in my econo commuter, a 95 honda civic vx hatchback on the passenger's side trunk area.

On to my question.

In positioning the subwoofer, is there such thing as being too close to the back of the trunk/hatch?  I've created a (crappy) mock up of the speaker (paper plates and computer paper, yay!) and am looking for the optimal placement and direction.  The Hatchback itself is more of a wagon, so would tilting the speaker up be any better than having it rear facing in a more linear fashion?

Here are some pictures to clarify:

Hatchback Side View:

Subwoofer Placement and Pointing -- posted image.

Full Trunk

Subwoofer Placement and Pointing -- posted image. 

Passenger's Side

Subwoofer Placement and Pointing -- posted image.

Maximum Rear Position, Facing Rear

Subwoofer Placement and Pointing -- posted image.

Mid Rear Position, Facing Rear

Subwoofer Placement and Pointing -- posted image.

Max Rear Position, Facing Rear Corner

Subwoofer Placement and Pointing -- posted image.

Max Rear Position, Facing Trunk

Subwoofer Placement and Pointing -- posted image.

Which of these would be optimal?  Are there better choices? Any and all input will be appreciated.

Regards,

Greg

xraytriguy 
Member - Posts: 22
Member spacespace
Joined: December 21, 2006
Location: United States
Posted: December 29, 2006 at 8:27 PM / IP Logged  

Unfortunately, I can't see your pics.  After trying to imagine what your hatchback looks like (and googling some images of other 95 Civics), here is my humble opinion:

There is a thing called "cabin gain".  Your car has a HUGE amount of it.  It's the volume increase affected by sound being produced in a small enclosure - your car's cabin.  For example, 100 watts from a certain subwoofer placed 4 feet from the driver's seat playing in a 2006 Ford Expedition would not be nearly as "loud" as 100 watts from the same subwoofer also placed at 4 feet from the driver's seat in your 1995 Honda Civic. 

There is an advantage to having a car with an angled rear window, ie: a hatchback.  If you were to place your subwoofer so that it would face that angled window, the "wedge" shape created by the window and the roof of the car will act as a "horn" which should further extend the ability of the subwoofer (not sure if this increases only SPL or if it in fact deepens the sub's bass response).  Therefore, I would suggest you turn the subwoofer to fire at the rear hatch window and then revel in the smallness of your car!

I'm not an expert at this, so I could be entirely off base.  I formed this opinion by reading these forums and other install-specific sites.  I responded to this mainly because I'm also trying to discover the best set-up for my car (2005 Suzuki Aerio SX) and would appreciate anyone else's opinions or corrections to mine.  Thanks!

bigred948 
Member - Posts: 8
Member spacespace
Joined: December 28, 2006
Posted: December 29, 2006 at 10:03 PM / IP Logged  

I don't know why you can't see my pictures.  Can someone else please chime in and let me know if my pictures are viewable?  Thanks.

As far as the hatchback is concerned, The civic hatchback glass is very vertical. Much like a wagon.  Would a slight angle upwards be better than running on a line parallel with the floor?

I'm am definately excited about adding a bottom end to my system.  I hope it turns out as well as you say it will.

-Greg

wretchedunloved 
Member - Posts: 29
Member spacespace
Joined: December 19, 2006
Location: United States
Posted: December 30, 2006 at 2:45 AM / IP Logged  
I can see your pictures.  I can't help much with your question, just wanted to let ya know the pictures are working for me.  Best of luck!
2001 Monte Carlo SS
Sony XM-2002GTR
Sony XS-L123P5 x 2
mike12volt 
Copper - Posts: 98
Copper spacespace
Joined: September 17, 2006
Location: United States
Posted: December 30, 2006 at 8:45 PM / IP Logged  
I would build a temporary mdf square box and hook it up.
Then play and turn the box with sub in any possible direction and listen for the best possible sound from your sub.
67sat 
Member - Posts: 6
Member spacespace
Joined: May 13, 2003
Posted: December 31, 2006 at 12:26 AM / IP Logged  
I own a '90 Civic.  Go to this website www.installer.com.  Scroll down & select "Tech Pages".  The very first topic at the top of the page is titled "Aiming your woofer box".  This guy conducted these tests using oscilloscopes, RTAs, all the toys to do it right.  After reading his articles (parts 1 & 2).  I had no futrher questions about which way to aim mine.  Hope this is helpful.
67sat 
Member - Posts: 6
Member spacespace
Joined: May 13, 2003
Posted: December 31, 2006 at 12:27 AM / IP Logged  
And yes, I can see your pics
xraytriguy 
Member - Posts: 22
Member spacespace
Joined: December 21, 2006
Location: United States
Posted: December 31, 2006 at 5:51 PM / IP Logged  

That's a cool site - good link.  It changed my mind about where to place my subs... 

I figured out why I can't see your pics - I've been accessing this site from work for a while and the security settings didn't allow it.  From home, I saw the images perfectly.  Nice mock-up for the sub - more people should think like you and do that kind of thing.

Good luck!

bigred948 
Member - Posts: 8
Member spacespace
Joined: December 28, 2006
Posted: January 01, 2007 at 7:37 PM / IP Logged  

67sat wrote:
Go to this website www.installer.com

Thanks, Check my 1st post.  I've already read that article. My differences are A) I have a hatchback, there is conflicting information between leaving a speaker linear, and poiting it towards the glass area.   B) How far can "all the way back" be?  Do I need to leave any room (3-6") or just enough so that the sub doesn't hit the side when it engages?

Thanks for your help.

90s civ and sub 
Member - Posts: 22
Member spacespace
Joined: December 31, 2006
Location: United States
Posted: January 02, 2007 at 5:06 PM / IP Logged  

BTW -  67sat let me use his login until I got my account established, which I have, so I'm actually the individual who replied to your issue, earlier.

What I have in my Civic (DX hatchback) is my box (14x9.5x9.5) pushed up against the back seat, sub facing the taillights.  I didn't angle the sub toward the window because I kept my cargo cover installed & my sub is @ 16" from the rear of the hatch.  I've faced the sub both front and rear to hear what was best.  Facing the taillights, was the hands-down winner. 

I don' t set the box "all the way" back to the taillights because that's not where I'm going to run it.  Spacing?  If you're going ported, I'd place it no closer than 1 port diameter to any wall.

For my next enclosure, I plan on building a larger enclosure extending from the rear of the back seat to the rear edge of where our strut towers are mounted, leaving between 14-16" to haul stuff.

Parting note:  I'm currently running a Kicker 6.5" sub (f6.5a) in a ported box.  The cabin gain in our little vehicles is impressive!! Good luck.

 

90 Civic DX Hatchback- 135 amp alternator
92 Suburban - 200 amp alternator
Stereo rebirth, coming soon. . . .
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