Reverse sub mounting question.

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):

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:

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.

mikew04 wrote:

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

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Smaller cone area?

auex]I wrote:

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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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Ok, not to be a thread theif, how many DB's could you potentially loose if you mounted both of your subs inverse? And how much effect will it have on SQ?

Chris

If you have a great driver and a well-built, properly sized enclosure, then loss of SQ should not be a concern.  There are some tight situations where the only way to build the sub is to invert it because of space limitations...in SQ systems.  IIRC S. Kephart has something like that in the front of his car, and he's all about SQ as you all know.  And if using enough power, loss of db's wouldn't be an issue either.  I've not heard of any complaints where someone inverted two of three (or so) subs, had the air volume corrected to compensate...and noticed a reduction if db's after doing so.

I'm of the opinion, however, that in most cases of sub inversion, the purpose is to show off the rear end of the driver.  That's not SQ talking. 

Ok, well thanks for all of the input everyone, but i got kind of lost and that diagram while it was cool, totally went over my head. I am building a fiberglass enclosure and just for sh*t's and giggles i inverted them to see how it would look and i just wondered if theyd put out the same and stuff. Here is what i did *****NOTE: The enclosure is NOT finished yet, that shot is with ONLY resined fleece**** So, if I installed these two just like this, would there be any problems? Thanks!!

If you have both of them inverted then you can wire them normally at the woofers and just switch the main positive and negative wires at the amp.

When you're done, if you want to hide the wires better you can use one or two of the holes for mounting the woofer to run the wire through. Make sure to seal it up though.

It'll probably flex, and not sound right.  Throw some fiberglass on it until it doesn't flex, then use some body filler to get it smooth.