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Old 06-04-2012, 06:15 PM
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Default Box question for Crossfire XS v2 15

So planning a box for the crossfire 15 I dont have alot of power right now going to be running my RD 1750.1v1 @ .5ohms on it.

My current single 15" box is 3.5 cubes before sub displacement with a 6" x18" long (uncut) aero. The crossfire is too big of a sub for the box it will take up too much air space and it wont fit in there anyway too much mounting depth on the woofer.

The box I am planning to make for the crossfire is 4.5 cubes net @ 28hz with the full length 6" aero. My question is would that be enough port area for this sub and that volume of box or should I go with a slot port with a decent amount of port area? Port area comes out to a hair over 6 sq in per cube with the 6" aero which seems like it may be too small. Current box for 1 15 (3.5 cubes with a 6" aero) is like 8 sq in per cube and its plenty of port IMO just wondering what you guys think.

I dont have money to upgrade power anytime too soon here so I wont be upgrading power for a while but when/if I do itll be 3-4krms so basically for now 2k or less power.
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Old 06-05-2012, 04:10 PM
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I know I'm going against the grain here, but I don't even want to know where all this port area per cubic foot thing came from. Adequate port area is needed to keep vent velocity low and is much more dependent on cone excursion than enclosure volume. Volume will dictate the tuning frequency along with the port area and length.

Post up the T/S parameters for that sub and I will be happy to model it for you using Akabak.
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Old 06-05-2012, 04:21 PM
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Quote:
Originally Posted by guitar maestro View Post
Post up the T/S parameters for that sub and I will be happy to model it for you using Akabak.
Havent found anywhere that lists even close to a full set of TSPs for these subs.
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Old 06-05-2012, 04:38 PM
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3.5-3.75net after all displacement per crossfire
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Old 06-07-2012, 07:43 PM
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Doing some testing with my current box and sub before I make the box for the Crossfire.

Its a single sa15 setup for sub up port back and have tried:
-sub up, port back
-sub back, port drivers side
-sub up, port drivers side

I like sub up, port back and sub up, port drivers side seem about equal.

Wish I had a meter to see whats louder but its very similar. Still undecided.

Dont want to do port passenger side cuz the quarter panel is ripped already from a stress crack + 4 sa12s on a saz3500 @ .5 ripped it open pretty good and dont want it to get worse.

Probably just going to do sub up, port back. Going to do some more testing with different tracks.
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Old 06-07-2012, 09:11 PM
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BTW this is going in a 98 Grand Cherokee and to the ear there was more pressure/intensity of the 40-50s range with sub up, port drivers side possibly better numbers hard to tell by ear. Lows seemed about equal between sub up , port back and sub up, port drivers side, maybe a little bit better/more solid sounding lows with port back thats why Im leaning towards that since I dont care about numbers really and probably will never get it on a meter around here, I just like nice daily that can play the lows decently.

Just saw this earlier during research phases:
post 18
Post 20

He has a 97 Grand Cherokee and was hitting loudest (didnt say numbers but sounds like he was metering it) with seats down box back away from hatch and aiming at a diagonal towards the passenger rear/hatch corner.

He also said sub up, port drivers side was pretty good thats what made me try moving the box around a bit.

I am going to try them all again with a few different tracks each:
-sub up, port back
-sub up, port drivers side
-sub back, port drivers side

and also
-sub drivers side, port back
-sub drivers side, port up
-sub up, port diagonal to corner/hatch

See what I come up with sounding good to my ear.

Dont want to have to build a bunch of different boxes to get this right since I probably going with birch this time and double layer whole box too so thats more wood wasted if I end up rebuilding (dont want to do that).

Last edited by 98GCLimited; 06-07-2012 at 09:26 PM.
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Old 06-07-2012, 09:15 PM
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If you're doing 4.5 cubes, need a 8" aero
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Old 06-11-2012, 12:50 PM
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Probably going to end up being 4 cubes net @ 32 with 15x4x32 port. Can always make the volume a little smaller if I wanted to by adding a large 45 in a corner or something like that.

I had inverted mounted it in my 3.5 cube @ 32 box with the 6" aero and I think when it gets more power on it the 6" aero will be on the small side for this sub cuz its not even moving half xmax on the rd amp @ .6 and moves probably twice the air through the port as the sa15 was.

I think I am going to sell the RD amp and get a SoundStream DTR1.3400d run it at .6 on the crossfire should get it going pretty good for now.

Heres some pics of the Crossfire next to an sa15:







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Old 06-11-2012, 01:38 PM
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i will say this broham, youre putting alot of research into this before you do anything. i think us that have been down this road before know the feeling lol
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Old 06-11-2012, 03:38 PM
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Are you able to build the box bigger? Honestly with only a 1700 on it I'd go nearly as big as you can. 4-4.5 would probably do very well, I had mine in 5 a piece on 2 3500s and they took it no problem. Keep that in mind, tuning is up to you though. Good luck.
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