Just a question

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=14811
Printed Date: July 21, 2025 at 8:06 PM

Topic: Just a question

Posted By: Trent109
Subject: Just a question
Date Posted: June 12, 2003 at 4:58 AM

Ok, i dont know if this is the correct term, but what are the advantages of piggy backin your subs like the one this guys has in his explorer

https://www.sounddomain.com/member_pages/view_page.pl?page_id=293506&page=2

Thanx
Trent Hamilton

Replies:

Posted By: esmith69
Date Posted: June 12, 2003 at 8:18 AM

Well it says he has 4 amps and 4 subwoofers so I'm guessing he's running one amp per sub.....what exactly did you mean by "piggybackin"?

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Ethan
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Posted By: bberman1
Date Posted: June 12, 2003 at 10:21 AM

Are you talking about having the back of the sub showing instead of the front? If so it’s called inverting the sub. The only reason it’s done is for looks.

Posted By: Trent109
Date Posted: June 12, 2003 at 3:16 PM

yea, i just heard the term piggy backin at a comp one time, i met where the back of the sub is showing, thanx for the posts

Trent Hamilton

Posted By: bberman1
Date Posted: June 12, 2003 at 3:48 PM

Your welcome

posted_image

Posted By: Okoboji
Date Posted: June 12, 2003 at 5:34 PM

THATS A ISOBARIC DESIGN!! i think thats how its spelled... if its set up so that there is nothing blocking the passage of air between the two subs (the two opposites) it cancels out even order distortion and improves the subs sound at higher levels....

Posted By: wvsquirrel
Date Posted: June 13, 2003 at 12:06 AM

Actually, Trent109 you were partially correct in the beginning (even though you were thinking of something else!). A Piggy-Back layout is a type of Isobarik configuration (not an Inverted Layout like you were thinking). Inverted layouts simply take a sub and mount it backwards (also having to decrease the internal volume of the enclosure to account for the sub's no-longer present displacement). Isobarik layouts involve mounting 2 subs together in either a Clamshell, Planar, Back-to-Back Tunnel, or Piggy-Back Tunnel. But it looks like that guy is using a Clamshell Isobarik Layout, not a Piggy-Back.

Here's some info from JL on Isobarik FAQ's and different configurations such as Piggy-Back and several others.

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Squirrel
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