FI Q: 15 ported or 18 sealed

[PESteele 10+ year member]

which way should i go both off of 1000 watts.

15 would be in 4 cf tuned to 28

and

18 would be sealed in 5 cf

im looking for sql and trying to stay near how loud my cvr is but with alot better sq

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[filtor1 10+ year member]

What will you be using it for? If just a daily SQ sub, I personally would save the extra space by diong the 15". If space isn't an issue, go with the 18" for the extra cone area. If SPL, the 18", I think, would be the way I would go.

 

[adio 5,000+ posts]

do the 15 and you can save space like filtor said. plus if you wanna tune higher you can..... 33Hz is the highest i would go. most music (95 - 99%) the bass WILL NOT drop below 38Hz, unless you're gonna listen to bass songs all day.

plus if you tune it to 33Hz, the bass just doesn't stop at 33Hz, it's gonna drop down to 29 or 28Hz and then after that, you might not hear it or feel it anymore

 

[shawnfleming 10+ year member]

ported 15!

 

[mannyb18b]

do the 15 and you can save space like filtor said. plus if you wanna tune higher you can..... 33Hz is the highest i would go. most music (95 - 99%) the bass WILL NOT drop below 38Hz, unless you're gonna listen to bass songs all day.plus if you tune it to 33Hz, the bass just doesn't stop at 33Hz, it's gonna drop down to 29 or 28Hz and then after that, you might not hear it or feel it anymore

I listen to music all day in the low 30's //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

 

[MikeyB 5,000+ posts]

do the 15 and you can save space like filtor said. plus if you wanna tune higher you can..... 33Hz is the highest i would go. most music (95 - 99%) the bass WILL NOT drop below 38Hz, unless you're gonna listen to bass songs all day.plus if you tune it to 33Hz, the bass just doesn't stop at 33Hz, it's gonna drop down to 29 or 28Hz and then after that, you might not hear it or feel it anymore

That all depends on the ssf on the amp

 

[mannyb18b]

unless your an uber idiot the ssf is not goin to be set at tuning freq.

 

[PESteele 10+ year member]

i think im gunna go 18 ported tuned low

 

[shawnfleming 10+ year member]

i think im gunna go 18 ported tuned low

well thats even better! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[PESteele 10+ year member]

i didnt think i could fit 8 cf but now i can so im gunna go that way

 

[MikeyB 5,000+ posts]

unless your an uber idiot the ssf is not goin to be set at tuning freq.

so are you suggesting to set it below tuning freq?!?!

 

[iagrdshaka 5,000+ posts]

That all depends on the ssf on the amp

Who uses the SSF? //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[Fi Car Audio 10+ year member]

I always suggest to set it below tuning frequency by a few Hz. The corner frequency of the filter is already a few dB down. Setting the SSF right to the tuning will reduce output at tuning. Enclosures do not completely unload the sub a hair below the tuning frequency... it is gradual for a few Hz. I try to blend the increase in cone excursion/lack of enclosure/port control with the SSF so that it blanaces things out more. Yes, you are pushing things a little more and relying on the customer to set things right in order to make sure you dont have issues... but setting SSF to tuning simply kills off "safe" output.

 

[MikeyB 5,000+ posts]

I always suggest to set it below tuning frequency by a few Hz. The corner frequency of the filter is already a few dB down. Setting the SSF right to the tuning will reduce output at tuning. Enclosures do not completely unload the sub a hair below the tuning frequency... it is gradual for a few Hz. I try to blend the increase in cone excursion/lack of enclosure/port control with the SSF so that it blanaces things out more. Yes, you are pushing things a little more and relying on the customer to set things right in order to make sure you dont have issues... but setting SSF to tuning simply kills off "safe" output.

I was just referring to how adio didnt specify anything to the original poster, and I was confused about what mannyb18b was saying. Thanks for clearing that up for me.

 

[filtor1 10+ year member]

18" ported wasn't an option up top, but I def like your train of though. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif Do it....