Advice for ported box in E46 M3 Trunk. DC2K. 2 XL12's.

[Wicks]

Hey Guys,

I'm new to DC Audio and ported boxes in general.

I've always done sealed back in the day.

I've got a DC2K already and I'm planning on two XL12's(m2) Dual 1 coils so the amp will be at 1 ohm.

Yeah, yeah, I know they'll a lil underpowered, but I want to start with a great set of subs and only upgrade the amp in the future if I want to.

So here's the box dimensions I came up with:

My design goals:

Subs forward with the box sealed off from the rest of the trunk to reduce rattle and help focus the output in the cabin.

Port up so I can utilize the rear deck as much as possible.

Subs will be set back from the rear seats as well which will allow then to vent upwards too so I don't have to punch through the rear seat as much.

The rear seat does drop down but I don't want to have to drop it everytime I get in the car.

I'd like the port setup to be as simple as possible as I'd like to use some plexi on the box to show off those beefy XL motors.

That means I'd like to stay away from any compound bends and elaborate ports that would hide the subs, if possible.

I already know the first comment will be "more port!" but a bigger port also means a longer port and I don't have that much room to play with...?

Since I'm not running rated power to the subs, I figure the box can be larger than the specified 1.5^3 per sub. I'm at 2.5^3 per now.

Is that a safe assumption?

Is the 36Hz a good place to tune for? I listen to a bit of everything so its got to have good range for all music. No need for burping.

OK whatcha got?

[LoudBimmer]

do you have HO alternator? if not, upgrade it first before installing amp

[Wicks]

Not yet but I'm looking at a 250a Singer. Hitting the group buy on a couple XS XP3000's at the least.

[Wicks]

Bump. Any help/comments are appreciated.

At what port area do you have to worry about port noise?

I'm thinking interchangable port so I can change it if needed?

Thanks guys.

[Guest]

thats half the port area you should be using. end result will probably make the woofers sound like shit and have a LOT of port noise

[Wicks]

thats half the port area you should be using. end result will probably make the woofers sound like shit and have a LOT of port noise

Hmmm, that's what I figured....

I'll see what I can do about upping the port length then.

Thx for the input!

[Joe X]

Try to fit aero ports.

[Wicks]

Try to fit aero ports.

I was aiming that direction, but to hit the desired port area, I think the port length will be longer than any dimension on the box. Soo I'll probably need an L-shaped slot port or something similar. Unless I do an elbow joint on the aeroport...not sure how that'd work..

[Joe X]

That would not be a problem as those can be found anywhere:

http://www.ebay.com/itm/PVC-Sch40-Socket-Slip-El-406-90-degree-Elbow-Glue-/220502085962?pt=LH_DefaultDomain_0&var=&hash=item7912772f33

The problem is make all the dims work.

[Guest]

you can do part external and part internal aero ports