Reverse sub mounting question.

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95Pony

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Posted: May 01, 2005 at 10:29 PM / IP Logged

Ok, you know when you see all the show cars and demo vehicles and everything and theyll always have there subs(or at least one of them) reverse mounted. My question is: whats the difference? Do you get the same performance out of the sub? Or is it just for show and actually does compromise SPL and SQ and make it not as efficient? Thanks!! (Sorry if this topic has been covered and exhausted!!)

geepherder

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Posted: May 01, 2005 at 10:41 PM / IP Logged

Usually this is just for looks, but if you have an undersized box, this can afford you some extra air space. You don't really have to worry as much about puncturing the cones, either. If you plan on doing this, with multiple woofers, be sure you wire them so they'll all push the same way, and avoid cancellation.

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95Pony

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Posted: May 01, 2005 at 10:44 PM / IP Logged

What do you mean "so they all push the same way? and avoid cancellation" I have 2 DVC rockford HE2's that i would run in series or parallel would they be going the same way that way?

Francious70

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Posted: May 02, 2005 at 12:37 AM / IP Logged

If one sub moves in, whilst the other moves out, the sound waves will cancel each other out, resulting in a net of 0 volume.

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Ravendarat

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Posted: May 02, 2005 at 1:05 AM / IP Logged

would you be looking at mounting one or both inverted?

double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

auex

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Posted: May 02, 2005 at 1:19 AM / IP Logged

If you mount one sub correctly and one inverted then you would wire one of the subs out of phase so that they move in the same directions at the same time.

Pro's - Looks, cooling, depth issues within box.

Con's - Small loss of cone area (ie less potential output), possible damage to motor assembly, possible sealing issues(you can flip the rubber gasket the sub came with and disregard this), and a couple others.

Now there is no reason not to go ahead and invert your subs, I usually have one of mine inverted because I like the look and only one time did one of the speaker leads come off the post.

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stevdart

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Posted: May 02, 2005 at 5:38 AM / IP Logged

Example of reverse polarity on an inverted DVC sub using typical series/parallel wiring (the one in the middle is inverted between two normally mounted subs):

Reverse sub mounting question. -- posted image.

This type of wiring can get tricky because of a lot of factors: number of subs in all, number that are inverted, the confusion factor caused by dual voice coils, etc. Let the forum know what you plan to do and we'll look over your wiring.

Here's a representation of what an inverse-mounted sub does to the relationship of air volume in the enclosure:

Reverse sub mounting question. -- posted image.

So that means in order to keep the volumes of air for each sub the same, you would have to use some solid fill in the inverse-mounted chamber because of the added air volume caused by reversing the sub. Or build the one chamber that much smaller right from the start. Or....if all subs share the same air space, calculate the whole volume to compensate for the inverse mounting.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

mikew04

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Posted: May 02, 2005 at 11:39 AM / IP Logged

Is there any noticible difference because of the smaller cone area?

DYohn

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Posted: May 02, 2005 at 2:44 PM / IP Logged

mikew04 wrote:

Is there any noticible difference because of the smaller cone area?

Smaller cone area?

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mikew04

Copper - Posts: 52

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Posted: May 02, 2005 at 3:41 PM / IP Logged

auex wrote:

If you mount one sub correctly and one inverted then you would wire one of the subs out of phase so that they move in the same directions at the same time.

Pro's - Looks, cooling, depth issues within box.

Con's - Small loss of cone area (ie less potential output), possible damage to motor assembly, possible sealing issues(you can flip the rubber gasket the sub came with and disregard this), and a couple others.

Now there is no reason not to go ahead and invert your subs, I usually have one of mine inverted because I like the look and only one time did one of the speaker leads come off the post.

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