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Old 09-10-2010, 03:26 AM
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Default 4th order for 2 Type R 12's

I am starting a rebuild on my car. I am retaining the equipment I have, hopefully fixing what is broken and using that, and just cleaning things up and doing them RIGHT this time. My previous enclosure was 1.3 per @33hz, divorced chambers, 4" PVC port. Not enough port, and I felt it didn't play high nor low very well. Anyhow, the box got wet in some areas and is just old, nasty, and has gotta go.

I'm starting to play with the idea of going fourth order. I entertained the idea about a year ago, but ended up not building it. I figure now though that since I'm going to be building a box I might as well try. My idea was to use the 6x9 holes as my port openings to try and minimize hacking up the rear tray. If I have to enlarge the holes, that's fine. I also may be able to get a back seat with a fold-down armrest; next time I am at the junkyard I can get measurements of that to see if it's even worth it (I am looking for one that folds fully down, I know they're out there, they're just hard to find.) Goals for this build are to play as low as possible, but still have a decently flat response.

Car is a 1996 Grand Prix sedan, and off the top of my head I believe the trunk is 36 wide by 30 deep by 18 high. If memory serves the openings only allow a 16 high enclosure to go in though. Power is unknown as of yet (depends on if I can get the MTX fixed or not) but will be in excess of 1000w.

Anyone have any recommendations for port area or general airspace? I was told on another forum to go about 2 cubes sealed and 4 ported, which is the whole darned trunk. I have a design I got on here last year that was smaller though. Is all that space necessary?


CLIFFS:

2 Type R 12's, 1000-1500w, 1996 Grand Prix, thinking 4th order, would love any advice and/or input.
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Old 09-15-2010, 02:42 AM
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I plugged T/S into winISD and it defaulted a 1.7 cube sealed, 1.1 cube ported tuned to 47hz. Does this sound alright?

How much port area should I be using?
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Old 09-15-2010, 03:10 AM
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[all volumes are plus displacement]

-----------------------
sound good;
2 cu ft front
1.5cu ft rear

50.2 hz

(2) 4" ports 10.25" long



-------------------------------------
sound ok but be louder;

3 cu ft front
1.5cu ft rear

49.8 hz

(2) 4" ports 6" long
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Old 09-17-2010, 01:11 AM
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or how bout 1.5 sealed 4.cubes ported area with 1 60 square inch port tuned to 50hz
should be loud and u can slam 1k on each 12
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Old 09-17-2010, 02:45 AM
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I have 2 12" types r's right now in a ported box I think around 1.75 cu ft each tuned @ 35hz, they sound great, and get loud. I think most people get their types r boxes tuned to around 35hz.
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