FI Audio SP4 15 box help

[NorthSPL]

Looking for some specs on an enclosure for a FI audio SP4 15. It's going in my 2015 Subaru Crosstrek. My max external dimensons are 36.5"w 19"h 20.5"d. Thinking of tuning 30-34hz in a 4.0ft3 enclosure. It'll be powered by a crescendo encore 4.5k either at 1 or .5 ohm. My electrical is a xs power d4700 under the hood, a xp950 in the back and a Golden Auto Electrical 300A alt.

[magillaru]

You might want to consider shrinking that airspace a little. With that power, you'll want 3-3.5 net and around 60 sq in of port would do well.

[Mr DeeBeez]

This is the box that I have for my sp4 15. 4 cubes tuned to 32hz.

Box design should be a couple posts in on this thread:

http://www.stevemeadedesigns.com/board/topic/197997-fi-sp4-15-box-help-please/

[Joe X]

So here is a suggestion, If you have more than 20.5" D port back may be an option, power: <4000W, amp subsonic filter to 28Hz, figure is just an assembly guide:

[NorthSPL]

Many thanks!!

[miniSPLlancer]

You might want to consider shrinking that airspace a little. With that power, you'll want 3-3.5 net and around 60 sq in of port would do well.

Built a box for a buddy, 4ft3 slot port on SQ 3500.1 at .35 ohm and ate it up. Played down to 22z full tilt.