Trying to dig as deep as possible with SI 18" sealed - AVS Forum
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post #1 of 13 Old 08-24-2014, 08:30 PM - Thread Starter
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Trying to dig as deep as possible with SI 18" sealed

I am looking to dig as deep as possible, low teens, with a Stereo Integrity SI 18" - which size sealed box will get me the deepest response with authority? (using iNuke 3000DSP) Can't go ported, just too big for the space it will be in.

Thanks in advance, you awesome crazy basshead experts!

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post #2 of 13 Old 08-24-2014, 10:22 PM
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IMHO, the best thing you can probably do is go with a 4cuft box and apply a Linkwitz Transform filter to it. That will get about as much out of a sealed box as you can get.

Go multiple (2 or 4) sealed and you will gain bigger db down low. But if you are only building one, and want results worth mentioning for anything below 20Hz you'd best go ported.


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post #3 of 13 Old 08-24-2014, 11:21 PM - Thread Starter
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I would eventually be doing 4 of these. Never heard of a Linkwitz, what is that?

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post #4 of 13 Old 08-25-2014, 01:50 AM
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There's a good explanation of it here: http://sound.westhost.com/linkwitz-transform.htm

Basically it is an EQ filter mirroring the roll-off curve of the sub. As it goes down 2db, it compensates by adding 2db of EQ up. So you can get a fairly flat response almost like a ported box. Only thing is, you need a ton of power, and a ton of excursion to hit 15Hz with any kind of volume. I would also suggest a high pass filter because driver excursion increases in order to 'add' the 2db of EQ for example.


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post #5 of 13 Old 08-25-2014, 01:51 AM
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From that link:


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post #6 of 13 Old 08-25-2014, 02:15 AM
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bear in mind you can't directly enter an LT with the DSP in the inuke, you can approximate it using a combination of PEQ and LS though. FWIW I wrote an example of how to do that using the minidsp LT calculator here (link goes to different forum)
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post #7 of 13 Old 08-25-2014, 03:25 AM - Thread Starter
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I also have two ported subs with 15" TC Sounds drivers (tuned to 19hz) in them powered by an iNuke 3000DSP. Just looking for a little extra. Would two SI 18" 4cu ft. subs get me more output in the teens?

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post #8 of 13 Old 08-25-2014, 04:28 AM
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Sounds like you have an awesome setup already. I personally wouldn't mix sealed with ported though. There was a huge discussion on this recently. I would suggest 2 SI's in Martycube's (or similar) to keep with the ported thing you have going and you can EQ some more into the low end to match the slightly lower tune of your TC's. Your system will be unstoppable!


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post #9 of 13 Old 08-25-2014, 04:36 AM
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How large is your space?

 

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J Dunlavy:.. if you stop to think about it, no loudspeaker can sound more accurate than it measures.

 

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post #10 of 13 Old 08-25-2014, 05:29 AM
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you will prob need more amp then the in3k but the SIs will do it depending on room size and seating distance. 4 with correct power and EQ in sealed boxes should easily get you to 10 Hz


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post #11 of 13 Old 08-26-2014, 12:09 AM - Thread Starter
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Quote:
Originally Posted by AudyoVidyo View Post
Sounds like you have an awesome setup already. I personally wouldn't mix sealed with ported though. There was a huge discussion on this recently. I would suggest 2 SI's in Martycube's (or similar) to keep with the ported thing you have going and you can EQ some more into the low end to match the slightly lower tune of your TC's. Your system will be unstoppable!
Hmmm, I didn't know you couldn't mix them. Yeah these TC's sure kick some serious ass. Love em! Maybe I'll just do a few more TC Sounds ported 15" subs... Hmm...

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post #12 of 13 Old 08-26-2014, 01:50 AM
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ported and sealed can have different phase response, and if phase gets too far off, cancellations instead of summations can occur. were you thinking about 2 si 18's or just one?

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post #13 of 13 Old 08-26-2014, 01:59 AM
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Quote:
Originally Posted by blake18 View Post
Hmmm, I didn't know you couldn't mix them. Yeah these TC's sure kick some serious ass. Love em! Maybe I'll just do a few more TC Sounds ported 15" subs... Hmm...
I think this is the best idea ever!


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