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chuey_316

My 1st 4th order. Can someone tell me if I'm on the right track?

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I'm doing a rebuild here very soon, and I'm getting the box design figured out. I'm going for a 4 Skar SDR-18's in a 4th order b pillar wall in an 03 Trailblazer Ext, off an rp2000.1d. I'm unsure what to tune it to, so I'm working on 2 designs. one tuned to 50hz, and one tuned to 45hz. Here's what I've got so far.

Either boxes total net will be 36 cubes. 12 on the sealed side, and 24 ported,  with 506 sq. in of port area.  I'm looking for a setup that will sound good from 30 or under, up to 55-60hz, and be capable of 150's on music across the pass band, with the ability to float cans, do hair tricks, ect. Which tuning would be better to go with?

Next question is whether I'm figuring the tuning correctly. When tuning, would I tune for a 36 cube box, or just the 24 cube chamber? The numbers I've came up with so far have been figured by going off the ported chambers size, and I don't want my tuning to be way off.

I had a 7.5 cube ported box tuned to either 35.7, or 37.5 (years ago, can't remember which) with 80 or 90 sq in of port, with an RE 18HC off of 1200w that would do low 50's on music (on an AC, not a TL), and sounded good on almost anything I played. No box I've built since then in any of my vehicles have ever had the same power behind them, and I'm really trying to change that.

Thanks for reading.

Edited by chuey_316

1999 Blazer

AD-244 Alt (soon to be 2)

HU / Pioneer P7800MP

Sub / RE 18HC

Amp / Shopping for a new one

7.71 cubes 118 sq" port area tuned to 34.9hz

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You'd tune using the ported side - your 24cuft airspace.

I'll default other answers to someone who has experience with 4ths

 

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I am not an expert on the matter but have built a few. I think your sealed side is going to be too small for 4 18's and that is going to hurt your low frequency response. It would be best if you could get your hands on some box build software WinIsd is good, been using it for years but it will really give you an idea of what your response is going to look like. 


01 Chevy Silverado 2500

Pioneer 80PRS to a Kicker 700.5 (now just running the CDT's)

6.5" CDT HD carbon fiber components

Planet Audio BB2400.1 @ 1 ohm

4 Sundown audio SD10's

1999 Tahoe

2 Sundown Z18v.4 Dual 2's

4 Eminence Beta 6 for the doors 2 Eminence Alpha 6 for the Center console

2 JL audio 10w1 for center console midbass

CDT tweets in the doors and upstage

2-MB Quart RA 1000.4 1 will run the 4 beta's at 4ohm bridged 500x2 center console on other

MB Quart RA 640.4 on the tweets

Opti 7001 @ .5 ohm

Mechman 240 running the system and stock alt running the truck

4 optimas

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You've got the cone area, IMO youd  be better giving up some ratio for it to dig down nice and low.


01 Chevy Silverado 2500

Pioneer 80PRS to a Kicker 700.5 (now just running the CDT's)

6.5" CDT HD carbon fiber components

Planet Audio BB2400.1 @ 1 ohm

4 Sundown audio SD10's

1999 Tahoe

2 Sundown Z18v.4 Dual 2's

4 Eminence Beta 6 for the doors 2 Eminence Alpha 6 for the Center console

2 JL audio 10w1 for center console midbass

CDT tweets in the doors and upstage

2-MB Quart RA 1000.4 1 will run the 4 beta's at 4ohm bridged 500x2 center console on other

MB Quart RA 640.4 on the tweets

Opti 7001 @ .5 ohm

Mechman 240 running the system and stock alt running the truck

4 optimas

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