Port Lenght
- CarolinaCartel
- Regular Member
- Posts: 64
- Joined: May 16th, 2007, 7:17 pm
- Location: N.Carolina
Port Lenght
I'm building a box for a Kicker L7 15. The box is 4.33 cu ft before speaker and port displacement. The port opening is 3 in W and 17.5 in H. How Long would it need to be to tune the box to 36 hz. Right now the port is 16.5 in long. thanks for any help you can give.
1993 Mx-3 Gs
09 Setup
Headunit: Pioneer DEH-P80MP w/CD-IB100II & 60 gb Ipod
Speaker: 2 pr MB Quart ESA216 6.5" COMPONENT
Subs: 2 Sundown 15" Nightshades
Highs amp: Sundown SAX-125.2
Sub amp: Sundown SAZ-3000D
Electrical: All 1/0 KnuKonceptz Wire Power/Ground, Big 3, 8Ga Speaker Wire, KnuKonceptz Karma RCA's
Dampening: 120sqft 80Mil Thick Sound Destroyer Mat
Goal: 150 DB 149.9 Street Bass
09 Setup
Headunit: Pioneer DEH-P80MP w/CD-IB100II & 60 gb Ipod
Speaker: 2 pr MB Quart ESA216 6.5" COMPONENT
Subs: 2 Sundown 15" Nightshades
Highs amp: Sundown SAX-125.2
Sub amp: Sundown SAZ-3000D
Electrical: All 1/0 KnuKonceptz Wire Power/Ground, Big 3, 8Ga Speaker Wire, KnuKonceptz Karma RCA's
Dampening: 120sqft 80Mil Thick Sound Destroyer Mat
Goal: 150 DB 149.9 Street Bass
You would have to run it through a box building program to tune it, or you can tune it by a meter with a sine wave. Technically if you want it tuned for 36hz as your peak you would actually have to down tune it to account for the rise time of the sub so say 30-33 hz to peak at 36hz.
You can get a meter and run the max length port usable in your box. I would cut 2 exact lenghts. Using the 36hz sine wave at half volume and slowly trim the port down till you peak out on the meter writing everything down, basically the meter will yield higher spl as you trim and once it starts to decline that would be your peak, I would add 1 inch to the peak length result as at full volume your frequency will change by about 2 hz.
Curiosity makes me wonder why 36hz? If your trying to tune for the frequency of the car or spl your about 20hz off. For sound quality i would tune to 25-30.
You can get a meter and run the max length port usable in your box. I would cut 2 exact lenghts. Using the 36hz sine wave at half volume and slowly trim the port down till you peak out on the meter writing everything down, basically the meter will yield higher spl as you trim and once it starts to decline that would be your peak, I would add 1 inch to the peak length result as at full volume your frequency will change by about 2 hz.
Curiosity makes me wonder why 36hz? If your trying to tune for the frequency of the car or spl your about 20hz off. For sound quality i would tune to 25-30.
- CarolinaCartel
- Regular Member
- Posts: 64
- Joined: May 16th, 2007, 7:17 pm
- Location: N.Carolina
I was told that 36hz would give the best overall sound for my car. I don't complete i just want something that would be cross between spl/sq.
PS i builded the box and i'm pretty happy with it. I took to a local shop and it did 136 with 1 15" kicker L7 with only a 400 watt memphis amp. i think the box will be ok for me but i'm looking to upgrade my amp asap. i plan to get a kicker zx1200 or a autotek 1500.1d. but got to see how my money goes.
PS i builded the box and i'm pretty happy with it. I took to a local shop and it did 136 with 1 15" kicker L7 with only a 400 watt memphis amp. i think the box will be ok for me but i'm looking to upgrade my amp asap. i plan to get a kicker zx1200 or a autotek 1500.1d. but got to see how my money goes.
1993 Mx-3 Gs
09 Setup
Headunit: Pioneer DEH-P80MP w/CD-IB100II & 60 gb Ipod
Speaker: 2 pr MB Quart ESA216 6.5" COMPONENT
Subs: 2 Sundown 15" Nightshades
Highs amp: Sundown SAX-125.2
Sub amp: Sundown SAZ-3000D
Electrical: All 1/0 KnuKonceptz Wire Power/Ground, Big 3, 8Ga Speaker Wire, KnuKonceptz Karma RCA's
Dampening: 120sqft 80Mil Thick Sound Destroyer Mat
Goal: 150 DB 149.9 Street Bass
09 Setup
Headunit: Pioneer DEH-P80MP w/CD-IB100II & 60 gb Ipod
Speaker: 2 pr MB Quart ESA216 6.5" COMPONENT
Subs: 2 Sundown 15" Nightshades
Highs amp: Sundown SAX-125.2
Sub amp: Sundown SAZ-3000D
Electrical: All 1/0 KnuKonceptz Wire Power/Ground, Big 3, 8Ga Speaker Wire, KnuKonceptz Karma RCA's
Dampening: 120sqft 80Mil Thick Sound Destroyer Mat
Goal: 150 DB 149.9 Street Bass
-
- Senior Member
- Posts: 3825
- Joined: June 26th, 2003, 2:01 am
- Location: Puyallup, WA
A 36 Hz tuning frequency for a 15 is the SQ tuning? That'd have as much SQ as shoving a cat turd in your ear. I don't even tune my 10's that high. I don't have the Thiele-Smalls for the L7 in my box program, but I'd venture to guess you'd want it under 25Hz. My 15" is tuned to 18Hz to hit the LOWWWW notes on some of my stuff that has bass cello or organ.
Agreed lakers but IRC the squares don't like LOW LOW frequencies, They lose control tuned lower than 25hz, then again i would never use a square or a 15" sub for SQ anyway. The cvx however is very comparable to a JL in SQ reproduction. I prefer the 12"s however the JL 10"s are a tough sub to beat in the SQ department
- CarolinaCartel
- Regular Member
- Posts: 64
- Joined: May 16th, 2007, 7:17 pm
- Location: N.Carolina
thanks for the input guys. Laker if i can get you the spec for the L7 15 can you check the tunning for my box?
1993 Mx-3 Gs
09 Setup
Headunit: Pioneer DEH-P80MP w/CD-IB100II & 60 gb Ipod
Speaker: 2 pr MB Quart ESA216 6.5" COMPONENT
Subs: 2 Sundown 15" Nightshades
Highs amp: Sundown SAX-125.2
Sub amp: Sundown SAZ-3000D
Electrical: All 1/0 KnuKonceptz Wire Power/Ground, Big 3, 8Ga Speaker Wire, KnuKonceptz Karma RCA's
Dampening: 120sqft 80Mil Thick Sound Destroyer Mat
Goal: 150 DB 149.9 Street Bass
09 Setup
Headunit: Pioneer DEH-P80MP w/CD-IB100II & 60 gb Ipod
Speaker: 2 pr MB Quart ESA216 6.5" COMPONENT
Subs: 2 Sundown 15" Nightshades
Highs amp: Sundown SAX-125.2
Sub amp: Sundown SAZ-3000D
Electrical: All 1/0 KnuKonceptz Wire Power/Ground, Big 3, 8Ga Speaker Wire, KnuKonceptz Karma RCA's
Dampening: 120sqft 80Mil Thick Sound Destroyer Mat
Goal: 150 DB 149.9 Street Bass
-
- Senior Member
- Posts: 3825
- Joined: June 26th, 2003, 2:01 am
- Location: Puyallup, WA