Bandpass enclosure for E8's

[cubdenno 0]

Ran a box design through WinISD and wanted some input.

This is for 4 E8 8inch subs. It is a three chambered enclosure, each outside enclosure is 1 cubic foot tuned to 70 hertz. The inside enclosure is 2 cubic feet and is tuned to 40 hertz. The woofers will be mounted magnet end in the 1 cubic foot side two woofers per the 1 cubic foot side firing into the 2 cubic foot portion. This is for my kid who listens to mostly rap. Powering this will be a SAE1000d. A subsonic filter will be used to keep over excursion down. The graph on WinISD looks impressive in an open air environment.

Any reason to not utilise this box design?

[sundownz 197]

6th order ?

Would be loud - for only rap it should be fine.

Group delay is going to be very high so it may not sound great on more "SQ" type music.

[cubdenno 0]

Yeah I believe it is termed 6th order though I always called it a dual relex bandpass. It's for a 16 year old kid. We were going to buy a box, but he wanted to build one with me. Stepdad/stepson bonding and all that. Plus I figure its a good learning experience. Figure when he gets tired of the sound we can always do a 2 cubed ported low. The output is high but really flat in its passband.