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<blockquote data-quote="helotaxi" data-source="post: 2587644" data-attributes="member: 550915">Your major concern when setting up an IB install is going to be sealing the trunk off from the cabin.&nbsp; It&#039;s a lot of work and can be a pain in the butt.&nbsp; Beyond that, you do what you have to do to mount the subs you want to use.&nbsp; It is plausible to install a pair of 18s IB with a seatback height of only 14&quot; if you don&#039;t mind getting creative with the install.&nbsp; There&#039;s a link on here somewhere to an IB install that the Image Dynamics guys were doing with 4 driver in a fiberglass layout at all kind of odd angle to get them to fit.If you want to get an idea of power handling and so forth on the the different subs, download WinISD (<a href="http://www.linearteam.org" target="_blank">http://www.linearteam.org</a>) and set up the particular sub you are wondering about in a really large sealed enclosure and start playing with the input power and looking at the excursion plot.&nbsp; The power required to get it to Xmax is about the amount of power you will need to get the most out of the sub.&nbsp; A little more to account for power compression and front side loading from the cabin of the vehicle and a little headroom isn&#039;t a bad thing.Some subs will have an Xsus spec which is the suspension limit.&nbsp; Some also have Xmag which how far the motor can move the cone.&nbsp; The hope is that the first is larger than the second.&nbsp; In that case the sub will pretty much never bottom out in a sealed or free air environment (ported is a different story).&nbsp; If you don&#039;t have that info, you can always get an amp a little bigger than you think you need and use a combination of a subsonic filter and a conservative gain setting to keep it from bottoming.&nbsp; You can use a subsonic filter to keep the excursion form getting out of control at really low freqs (you&#039;ll still get usuable output down low) while allowing for more excursion, and thus more output, at higher freqs.&nbsp; In this respect, as long as you have a subsonic filter that you can adjust, you can come pretty much put rated power to the sub.&nbsp; Excursion, not heat, is your concern with music 95% of the time anyway.</blockquote>

[QUOTE="helotaxi, post: 2587644, member: 550915"] Your major concern when setting up an IB install is going to be sealing the trunk off from the cabin. It's a lot of work and can be a pain in the butt. Beyond that, you do what you have to do to mount the subs you want to use. It is plausible to install a pair of 18s IB with a seatback height of only 14" if you don't mind getting creative with the install. There's a link on here somewhere to an IB install that the Image Dynamics guys were doing with 4 driver in a fiberglass layout at all kind of odd angle to get them to fit. If you want to get an idea of power handling and so forth on the the different subs, download WinISD ([URL="http://www.linearteam.org"]http://www.linearteam.org[/URL]) and set up the particular sub you are wondering about in a really large sealed enclosure and start playing with the input power and looking at the excursion plot. The power required to get it to Xmax is about the amount of power you will need to get the most out of the sub. A little more to account for power compression and front side loading from the cabin of the vehicle and a little headroom isn't a bad thing. Some subs will have an Xsus spec which is the suspension limit. Some also have Xmag which how far the motor can move the cone. The hope is that the first is larger than the second. In that case the sub will pretty much never bottom out in a sealed or free air environment (ported is a different story). If you don't have that info, you can always get an amp a little bigger than you think you need and use a combination of a subsonic filter and a conservative gain setting to keep it from bottoming. You can use a subsonic filter to keep the excursion form getting out of control at really low freqs (you'll still get usuable output down low) while allowing for more excursion, and thus more output, at higher freqs. In this respect, as long as you have a subsonic filter that you can adjust, you can come pretty much put rated power to the sub. Excursion, not heat, is your concern with music 95% of the time anyway. [/QUOTE]

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