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high SPL w/o fold down seats


LoudBimmer

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Hello

As some of you know I have BMW 325i. Back seats do not fold down, so all I got is ski hole. Subs are 2 SA-10's. Now, I have tried 2 different types of boxes in there

First, was L shaped box, tuned to ~33 hz. Subs and port facing ski hole. At ~40 hz I got 134.8 hz sealed. On music with driver door open I got 136.7. This was with hifonics brz1200 and kinetik hc1800.

Second box was burp box with 8" PVC pipe. .5 CF between subs and 2.5 CF joined. On 44 hz tone I got 142.6 with driver door open. This was with saz-2500 and kinetik hc1800.

Question is, what it takes to get decently high score (145+) out of this types of set up? without fold down seats. Like placement of box, types of boxes and so on?

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Rear deck port Yeilds great results

But unless you're a pro in fab work I'd try something else..

Up your power....

And make the box accordingly to the power upgrade...

no rear deck ports lol and saz2500 is plenty for sa's.

I'm guessing it's all about placement of the box. After surfing thru other forums, it seems that L shaped box works the best with low tuning.

From what I read, I need to create 4th ordered bandpass from my trunk, using ski hole as port.

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