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why is everyones builds so damn huge! a single lvl 5 and 3.5k might be just right for me lol

12s work fine too...

The nubers show that it is not ideal for 4th order use, however I have four lvl 5 m3 15's in a 4th and it is nasty, plays lows (25hz) and does a 162.6 @ 51hz. I was worried that I chose the wrong enclosure for my subs but once I got the sealed side and port area correct I stood corrected. BTW, Thank you again Jeff for getting me on the right path!

Hello there, sorry to resurrect an old thread but just stumbled on this one and this guy was having the same issues I was and I went down the same road. Thought I'd share my experience, I've put it in this thread here http://www.fiestafaction.com/forums/threads/42371-Building-a-Fiesta-Sized-Subwoofer-Box I also have a hatch, started with sa-8 v.2. I was new to all of this and took advice from everyone who said to put 1kw of power to this 500rms sub, no one said anything about bringing the enclosure down to .5 to keep it safe until I blew up my coil 6 months later and talked to the guys at sundown. Yes they recommended .5 tuned to 34hz if going 1k watts which I also build and posted in that forum. I gotta say though after listening to the sub at double power on a larger box, the new box was disappointing. Also I found out that I did need all that room that the little box was taking anyway so I ended up rebooting my ideas into a sealed design in the floor of my hatch with the SD3-10's. Here's some quick pictures if you don't feel like going to the above thread although there is a ton more in the build log including sketchup designs and some spl tests: This second picture is the .5 box My current setup