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View Full Version : Please confirm that this is a GREAT box design for FI Sp4 D1



artrilliance
06-22-2013, 03:53 PM
Will be running Autotek MM4000.1d, 250amp alternator, xs 3100, Shiruken 100ah
https://sphotos-a.xx.fbcdn.net/hphotos-ash3/7877_10201380569301246_1619362659_n.jpg

SUNDOWNBITCH
06-22-2013, 04:05 PM
Will be running Autotek MM4000.1d, 250amp alternator, xs 3100, Shiruken 100ah
https://sphotos-a.xx.fbcdn.net/hphotos-ash3/7877_10201380569301246_1619362659_n.jpg

You design it?

Timmy13091
06-22-2013, 04:09 PM
Will be running Autotek MM4000.1d, 250amp alternator, xs 3100, Shiruken 100ah
https://sphotos-a.xx.fbcdn.net/hphotos-ash3/7877_10201380569301246_1619362659_n.jpg

No double baffle or bracing ? For a sp4 hmmmm

DDtC
06-22-2013, 04:11 PM
Little port also.

SUNDOWNBITCH
06-22-2013, 04:19 PM
No double baffle or bracing ? For a sp4 hmmmm

The exact thing i said

SUNDOWNBITCH
06-22-2013, 04:19 PM
No double baffle or bracing ? For a sp4 hmmmm

The exact thing i said

supereikenator
06-22-2013, 04:52 PM
I don't know for sure, but the SP4's are monsters, so I'd guess a bigger port is in order, and like they said, double baffle and bracing.

artrilliance
06-22-2013, 05:32 PM
Yes, I designed it and have redone the calculations for double baffle and bracing is already accounted for. As far as the port, it is 12.17 sq in. Should the 4" port width be wider, is that what you are suggesting?

DDtC
06-22-2013, 05:41 PM
16 square inches of port per cube.

artrilliance
06-22-2013, 06:14 PM
https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-ash3/944140_10201381476763932_713359078_n.jpg

I'm pushing to go for the larger box, smaller 4.5" port of around 14" cu in per foot, and keeping the tuning lower. Will this be a good compromise? My trunk space is maxed out and I feel from the WinISD graph that the larger box will have a smoother curve as well as gain closer to 3DB.

How is it looking?

artrilliance
06-22-2013, 06:16 PM
I have already tried adjusting port length and it starts eating up net box volume and takes a great deal more length for minor adjustments in tuning.

artrilliance
06-23-2013, 02:00 AM
Bump?

hispls
06-23-2013, 03:03 AM
I'd never tune that low or use less than 15" port.

artrilliance
06-23-2013, 03:10 AM
Seems that almost everyone running Sp4's are tuned very low, is that just personal preference?