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  #1  
Old 10-20-2011, 07:29 PM
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Default Experienced SPL Guru's box ?

is there going to be a difference mounting a flared aero port internally or externally to the box?

obviously external mounted gives you more net volume. but im talking besides that. has it make a difference on the meter for you guys?

i would think external would be better but maybe there is no difference at all
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Old 10-20-2011, 07:31 PM
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It's application dependant, but external is almost always a gain. Could be a tenth or two... could be a whole db. You just need to test.
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Old 10-20-2011, 07:36 PM
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Alot of vehicles have there boxes firing into the rear driver quarter panel. Porting external allows the ports to be one side of the vehicle while the subs are on the other side.
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Old 10-20-2011, 07:38 PM
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well im probably going to end up testing both, but if i design the box for external, and then mount it internal im going to be losing space inside the box which is a change as well...so i wont know for sure if it was the box being smaller that made me gain/lose or the port being in or out....im going to start with external tho.
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Old 10-20-2011, 07:44 PM
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Also...to 45 or not to 45? box is sub firing up and port on the side. ill try to get you guys a pic if you need one.
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Old 10-20-2011, 07:57 PM
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Originally Posted by e2theloc View Post
Also...to 45 or not to 45? box is sub firing up and port on the side. ill try to get you guys a pic if you need one.
Alot of people lose output when 45ing in an aero box
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Old 10-20-2011, 10:48 PM
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is there a good difference between using a thick doll rod or a threaded metal rod? id like to use the metal threaded but idk how i would cut it. also if i were to brace the box vertically with the threaded rod wouldnt the rod stick out the bottom of my box? causing it to sit funny
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Old 10-20-2011, 10:54 PM
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Quote:
Originally Posted by e2theloc View Post
is there a good difference between using a thick doll rod or a threaded metal rod? id like to use the metal threaded but idk how i would cut it. also if i were to brace the box vertically with the threaded rod wouldnt the rod stick out the bottom of my box? causing it to sit funny
Believe it or not, "dowel" rod still flexes so the all-thread is the better choice there. There is also no really great way to attach dowels so that's also a weak point.

I use my Dremal to cut it. Or a hacksaw. As far as vertical bracing, obviously you may not be able to do this with the all-thread due to the reason you mentioned, so dowels or even a scrap piece will be better than nothing.

But honestly, you really only need bracing once a box gets to a certain size or power level.
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  #9  
Old 10-20-2011, 11:00 PM
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I will say that 90% of the time external mounting will be a gain.

There are several reasons for this.

1) Smoother airflow in the box
2) Smoother airflow between the air mass inside the box and the air mass in the port
3) Easier tuning changes (which can greatly increase your score)

The one big BIG thing you need to test with an external port is different lengths. This can GREATLY affect your score. Just because a box is "tuned" to a certain frequency does not mean it will peak at that frequency. I've had some boxes gain anywhere from 1-4 dB just by changing the port length.

The nice thing about having the ports mounted externally is that they are easily changeable. Also, when you change the length you won't be changing the net volume of the enclosure like you would be if the ports are mounted internally. Just one other benefit of externally mounting them.

As for 45's and bracing, I advise to test the enclosure absolutely PLAIN before doing anything to it. This includes resin. You won't know what hurts or helps you if you don't have a baseline number to go off of.

Also, don't neglect the outside of the box as well. Rounding off corners, resin, etc. on the outside the enclosure can help as well.
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Old 10-20-2011, 11:03 PM
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i think that external aeros are a gain because of the air flow going strait out of the port, not having restictions if it were inside

remember SPL is all about efficient air flow

damn you tommyk
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