Need Box Advice

[ARMYSGT_D]

u can see pics in my build and videos

im running my 2 fi ssd 15 in a sealed box on the small side 3.5 cf.

also i got my 2nd t10001bd today

would my subs sound better in a sealed box with the correct airspace or a ported box thathas about 2.7 per driver

any other reccomendations would be appreciated

[ARMYSGT_D]

no one

[sactownstang]

If better means louder, ported is the way!

Sq wise the correct sealed is usually pretty good!

[ARMYSGT_D]

what i meant was how would the sound be in a ported box thats too small

Edited May 19, 2008 by ARMYSGT_D

[ptcary]

what i meant was how would the sound be in a ported box thats too small

It's a tradeoff, I'll use mine as an example. I had 4 12"s in a sealed box, proper airspace for each. It rolled of -3db at 46 hz, meaning it would not get low, but was still decently loud, and nice for daily listening on music.

My new wall is for 8 12"s, so space is limited, and instead of the ideal 32 hz tune, I end up with a 38 hz tune. It's still going to be able to get significantly lower than my old sealed box.

So you will be able to get lower with a ported box even though it is slightly small, compared to a sealed box.

For pure SPL, you will need to select a frequency to tune for that works with your car, so that the port can peak at that frequency.

[ARMYSGT_D]

It's a tradeoff, I'll use mine as an example. I had 4 12"s in a sealed box, proper airspace for each. It rolled of -3db at 46 hz, meaning it would not get low, but was still decently loud, and nice for daily listening on music.

My new wall is for 8 12"s, so space is limited, and instead of the ideal 32 hz tune, I end up with a 38 hz tune. It's still going to be able to get significantly lower than my old sealed box.

So you will be able to get lower with a ported box even though it is slightly small, compared to a sealed box.

For pure SPL, you will need to select a frequency to tune for that works with your car, so that the port can peak at that frequency.

how do you thing that would sound for daily listening the biggest box i can get in my trunk is about5.5 cf i just dont like the 1 note wonders i mostly use it for daily listening

[ptcary]

how do you thing that would sound for daily listening the biggest box i can get in my trunk is about5.5 cf i just dont like the 1 note wonders i mostly use it for daily listening

Ported box is still going to peak at it's tuning point. When I went through my tuning prob, Steve said try to get it tuned under 35 hz, I tried every which way, but could not get mine under 38.

I thought you might be rebuilding to get better numbers on the meter.

Go with the biggest box you can get, ask people here to help you with designing the port for ~33 hz and you should be pretty happy with it.

I think the one note SPL setups are tuned much higher 45-55 hz.

EDIT: I looked up the specs, I don't see why you would not be able to get it to 35 hz maybe less with almost 3 cu ft each. It'll just take some port design research.

SSD15

DUAL 1 | DUAL 2

Fs: 25.9 Hz | 25.3 Hz

Re: 0.75 Ohms/coil | 1.5 Ohms/coil

Qms: 4.78 | 4.89

Qes: .65 | ..58

Qts: .57 | .52

Mms: 246g | 258g

Cms: 0.15mm/N | 0.15mm/N

Sd: 810cm^2 | 810cm^2

Vas: 141.3 l | 141.3 l

Spl: 87.6dB 1W/1m | 87.8dB 1W/1m

Bl: 9.3 N/A | 00.0 N/A

Xmax: 21mm

Rms: 800W

Sealed box: N/A cuft

Ported box: 3-4 cuft @ 33Hz

Sub OD: 15.625”

Cut ID: 14.125”

Mounting depth: 8.000”

Displacement: 0.17cuft

Edited May 20, 2008 by ptcary

[ARMYSGT_D]

thanks for the insight