Mounting Subs out vs in
Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=42661
Printed Date: May 10, 2024 at 1:31 PM
Topic: Mounting Subs out vs in
Posted By: lummy
Subject: Mounting Subs out vs in
Date Posted: November 10, 2004 at 10:29 AM
Hey All,
I've seen quite a few sub enclosures with the subs mounted out so you can see the magnet. Do you have to make any adjustments to the enclosure size, and will any sub work or do they have to be "free air"???
Thanks Guys
Replies:
Posted By: supradude
Date Posted: November 10, 2004 at 10:35 AM
You shouldn't need to change the size of the box. If it is a sealed box, don't use free air subs. Remember to change the polarity of the speaker wires! ------------- '85 Toy
Posted By: boxmaker85
Date Posted: November 10, 2004 at 10:39 AM
Actually you will need to change the box size. To compensate for the lack of a subwoofer inside of it. Not a big change but something to concider. And use freeair subs like that in free air/infinate baffle. No sealed. But any other sub that's ment for a box should do fine.
Posted By: lummy
Date Posted: November 10, 2004 at 10:41 AM
Thanks for the quick reply guys.
Forgive my ignorance but why does the polarity need to be changed?
Posted By: ravenndude
Date Posted: November 10, 2004 at 11:11 AM
so that the cone of the sub is moving in the oposite direction. You want to sub to be "pushing sound waves" (i can't think of better words to use) away from the box and to your ears, not into the box.
Posted By: lummy
Date Posted: November 10, 2004 at 12:16 PM
Cool, understood  Thanks again.
Posted By: boxmaker85
Date Posted: November 10, 2004 at 12:34 PM
ravenndude... sorta but I think you're trying to say it wrong. A sub pushes waves both ways. In the box and out, no matter which way it faces. You switch them because when you hear a sound it's in the form of a wave right? So if I play a speaker right side out it plays a normal sine wave. When I switch it the speaker now plays that sine wave but it's offset. So while all the other speakers play normal sound this speaker (or sub) plays everything offset by half a wavelength (right everyone?). So now this speaker's canceling all the other music out (not totally but will be a large difference). That's why you switch it when you invert a sub. Prevents cancelation of soundwaves. Kinda confusing but like dude said it's hard to find words for it.
Posted By: placid warrior
Date Posted: November 10, 2004 at 8:19 PM
u wouldnt invert a regular sub tho would u? ive tried it with mine and it doesnt sound as good, and i know that u can buy subs that are meant to be mounted out but cost 2-3 times more.
Posted By: Alpine Guy
Date Posted: November 10, 2004 at 9:25 PM
theres no such thing as a sub thats meant to be mounted inverted. All subs can be mounted either way, , just play with the polarity on the amp until it sounds best. ------------- 2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: placid warrior
Date Posted: November 10, 2004 at 10:20 PM
hmmm...ok. Guy at the local audio shop musta been trying to make a good sale then... so the only difference really then is that the subs have a nice looking backside to it as well so it can be used as a showpiece then? I hate being a Newbie but i gotta start somewhere. I have found i can get the most bass out of the amps ive tried by connecting the negative of one sub with the positive of the other, so it doesnt matter anymore if its hooked up to + or - and then hooking it up as if it were a single mono sub. Is this bad for the amp or the sub? I know the capacitor(s) on my last amp ended up frying and a fuse melted, but i'm not sure if its from the way it was setup or just from being an old used Pyramid amp....maybe both?
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