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Car Audio Equipment
Subwoofers
Alpine type X 2020 or FI Q 15
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<blockquote data-quote="blazian87" data-source="post: 8709052" data-attributes="member: 574798"><p>So I have played with winISD a bit and see the big group delay in most ported alignments that you're talking about. It does look pretty significant. But don't forget that these graphs are before cabin reflections. Just by moving your enclosure more farther or closer can change your group delay. You turn your head 90 degrees and group delay is changing. I have heard that by EQing down the frequencies that are gained from the port can bring down group delay but then it would kinda defeat the purpose of going ported in the first place (more bass!). So right now the dual sub sealed box idea is looking like a good candidate since you have the power to back it up. I remembered when the guy (cscstang) built the T-line for me, he told me these enclosures are fast as hell, no lag. Since my box is a quarter wave length design, it's very straight and flat so they don't have a chance to lag behind. The sub goes straight into an equal length tube and out instantly through the port without any place to resonate like you see in a typical box. I pitched him the idea what would happen if I extend the port going sideways after it ends? He said it would just lower the tune. So he used that idea to create my enclosure except that it went all the way to where the sub meets. He reached out to keep_hope_alive, which is an acoustical engineer, and asked him if this was a good idea. KHA said this is actually ideal because the front wave and back wave are reaching each other at the same time and they come out together. Cscstang demo'ed me my first true T-line experience in his truck that had 2 15's in this ginormous T-line. He played a variety of music for me and one of them was this fast ass double bass pedal metal song and it had absolutely no problem keeping up while being incredibly loud. What impressed me the most tho was that he was able to switch up to any genre of music and be able to hit every damn note at full blast like no tomorrow.</p></blockquote><p></p>
[QUOTE="blazian87, post: 8709052, member: 574798"] So I have played with winISD a bit and see the big group delay in most ported alignments that you're talking about. It does look pretty significant. But don't forget that these graphs are before cabin reflections. Just by moving your enclosure more farther or closer can change your group delay. You turn your head 90 degrees and group delay is changing. I have heard that by EQing down the frequencies that are gained from the port can bring down group delay but then it would kinda defeat the purpose of going ported in the first place (more bass!). So right now the dual sub sealed box idea is looking like a good candidate since you have the power to back it up. I remembered when the guy (cscstang) built the T-line for me, he told me these enclosures are fast as hell, no lag. Since my box is a quarter wave length design, it's very straight and flat so they don't have a chance to lag behind. The sub goes straight into an equal length tube and out instantly through the port without any place to resonate like you see in a typical box. I pitched him the idea what would happen if I extend the port going sideways after it ends? He said it would just lower the tune. So he used that idea to create my enclosure except that it went all the way to where the sub meets. He reached out to keep_hope_alive, which is an acoustical engineer, and asked him if this was a good idea. KHA said this is actually ideal because the front wave and back wave are reaching each other at the same time and they come out together. Cscstang demo'ed me my first true T-line experience in his truck that had 2 15's in this ginormous T-line. He played a variety of music for me and one of them was this fast ass double bass pedal metal song and it had absolutely no problem keeping up while being incredibly loud. What impressed me the most tho was that he was able to switch up to any genre of music and be able to hit every damn note at full blast like no tomorrow. [/QUOTE]
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