experienced professional audio advice?

In my system I have a 240 amp alternator and I used Sparkys’ chart http://www.datafilehost.com/download.php?file=6d26c621 and it says that I only can allow up to 1915 watts in my system. When my system is at full power I have over 2300 watts. That is with my two 4 channels running. I have a Kicker ZX1500.1 that is rated at 1600 watt rms @ 2 ohm. I wanted to put two 15” L7’s subs in but when it comes to the box I have a problem. One place told me they can build a sealed box that can be removed. The other said they can build a ported box inside my trunk that would be permanent. I want a box built to the maximum size ported (6 cubic feet) so I can get full output of my subs. I was told that I don’t have enough room for both subs. I drive a 1992 Buick Roadmaster. So I was thinking about just using one sub with the big box that can be removed. I have the option of 2ohm dvc and 4 ohm dvc and my amp is 2 ohm stable. The subs are recommended 750 watts rms in the ported box and 1000 watts sealed. And I want all the spl I can get. But I don’t want my can not to start either. Pro’s what do you think I should do.

i already have two 15"L7's 2 ohm DVC and one 15"L7 4 ohm DVC. i was thinking i could use a 2 ohm in a series and get the 800 watts for everyday use and use the 4 ohm in a parallel and get the full 1600 watts when i want to show off just swap the sub. i just dont know how practical that would be.

Use the Dual 4 ohm speaker and wire up these 2 relays.  The amp will see an 8 ohm load untill you flip the switch then it will be 2 ohm.   Much easier than switching woofers.

Switching from Series to Parallel and Back

When the relays are at rest (normally closed position) the woofer coils are wired in series. When ground is applied to each coil (energizing the relay coils), the voice coils are wired in parallel. With 2 four ohm voice coils you'll have an 8 ohm load at rest and a 2 ohm load when the relay coils are energized. For each dual voice coil woofer that you want to change from series to parallel, you'll need two relays for each. They can all be controlled from the same switch.

mr freddy remember to turn off your radio whenswitching from series to parallel