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Old 08-24-2009, 01:34 AM
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Default Old Celica liftback - sub firing direction?

I'm looking for comments on sub orientation in an '82 Celica liftback to help me with enclosure design. This isn't my car but it is the same model in case you don't know your old cars right off the top of your head:

http://i36.photobucket.com/albums/e4...a/HPIM2926.jpg

I do keep my back seats down the vast majority of the time so everything behind the front seats is wide open.

I found a few references to backfiring subs in 'normal' cars with trunks to make sure the sub doesn't suffer from canceling waves caused by it not being at one end or the other of the vehicle. The back end of the 'trunk' in the Celica isn't near tall enough to actually direct backfire but I could build the enclosure for anywhere from 45deg up and back through up firing and on around to direct forward firing.

I will do what I can with the enclosure to allow multiple orientations in case the designed one doesn't work but still... comments?

Thanks,
-kyle

Edit: Should have mentioned I am looking for SQ and assume I'll be building a sealed box towards that end

Last edited by altendky; 08-24-2009 at 02:01 AM. Reason: Left out a few details
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Old 08-24-2009, 01:51 AM
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sub up/ port back- music

sub forward/ port back- spl
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Old 08-24-2009, 01:57 AM
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6th order band pass.

all ports up.

Music & SPL
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Box designs for $35.
My 'business' name is BBS (it means Built By Sonic)
I'm in Waterloo Iowa.
I do box designs for $35 paid before hand.
Most designs are done within 2 days.

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Old 08-24-2009, 02:02 AM
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Should have mentioned I am looking for SQ and assume I'll be building a sealed box towards that end.

Quote:
sub up/ port back- music
Would you stick with the sub up part for a sealed enclosure? Straight up? Parallel to the hatch (aka, a bit back)?
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Old 08-24-2009, 06:01 AM
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it should be good faced up
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Last edited by mytyeerinpie; 08-24-2009 at 06:11 AM.
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Old 08-24-2009, 10:56 AM
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Other than good experiences with aiming the sub up, any ideas why this is good? Seems to me that this gives:
  • Somewhat less direct bass to reduce an identifiable source
  • Somewhat less unwanted higher frequency noise (again because of indirection)
  • A partial horn loading of the driver depending on how close it is to the hatch (which, at best, I know little about at this point)
What do you think?

Thanks again,
-kyle
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Old 08-24-2009, 11:42 PM
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Horizontal orientation (aimed up) is the best position for a subs suspension which will make the sub will last longer.

Other benefits;

Phoenoninal gain achieved by the sound loading against the hatch. (loud as fnuck)

Vibration loads into the body of the vehicle extremely well. (you feel it in your bum)

Confined wedge of the hatch does project the force like a horn.(you hear the sound clearly)

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I'm in Waterloo Iowa.
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Most designs are done within 2 days.

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Old 08-25-2009, 02:16 AM
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Do you know how to account for these benefits in a design? I started to look into horns but this application seems to be significantly different since the listener is more or less inside the horn which itself is sealed. I'll continue to research the pseudo horn aspect (maybe play with hornresp a bit) but if you happen to already know a good reference site that deals specifically with this scenario that'd be great. :]
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Old 08-25-2009, 02:35 AM
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Don't think too much.

Don't call it a horn.

Just build a normal box.

Build the most efficient box you can.

Design it so the sound goes against the hatch glass.

Everything after that is just benefits of a hatchback.
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I'm in Waterloo Iowa.
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Old 08-25-2009, 11:03 AM
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Quote:
Originally Posted by iamsonic View Post
Don't think too much.
heh :] I have a few (somewhat related) purposes. I want to:
  • Setup a good sounding system
  • Learn as much as possible
  • Stretch my brain
It's amazing how much car audio has in common with the frequency response analysis aspects of control theory. Well, not that surprising, but still. I really just need to take more classes but in the mean time I apply what little I remember when I can.

Thanks again,
-kyle
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