15" kicker l7 30hz box design help !! - Page 9 - diyAudio
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Old 19th November 2012, 12:45 PM   #81
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OK I'll dig out the manual sometime in the next few days. If love to build this.
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Old 3rd December 2012, 05:10 PM   #82
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I see this is an older thread but hopefully somebody that was involved will speak up. I have a early 2000s L7 15D2 that I currently have in a large ported box tuned to 25hz in my HT. After seeing this and another thread using these in tapped pipes I really want to try it too. I'm very new to this design. My question is would it be possible to move the tuning frequency down to 20 or 25 Hz by simply making the pipe length longer but keeping the cross section the same? And if so how much longer? I'm thinking 30hz is a bit high for HT use. Thanks for any help I can get!
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Old 3rd December 2012, 05:15 PM   #83
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OK I'll dig out the manual sometime in the next few days. If love to build this.
It's HERE
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Old 3rd December 2012, 06:09 PM   #84
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FYI, for these specs, Re = 6.28 ohms.

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Old 3rd December 2012, 07:47 PM   #85
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I know he has a L5. He asked for an extended version of my previous pipe. All he has to do is plug in the L5 speaker parameters and see how it models with the L7 enclosure parameters.
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Old 3rd December 2012, 07:54 PM   #86
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7.10 ohm = 08S15L74.

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Old 4th December 2012, 01:26 AM   #87
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I know he has a L5. He asked for an extended version of my previous pipe. All he has to do is plug in the L5 speaker parameters and see how it models with the L7 enclosure parameters.
Hmm, he claims to have a L7 15D2, which has identical specs displayed in HR except with 6.28 ohm.......... As it turns out though, the 08S15L74 has some different specs, yet display identically in HR except for the 7.1 ohms. Wonder what the odds are on that?

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Old 4th December 2012, 03:48 AM   #88
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My fault! All the 5's mentioned by BDF350 in this thread and my T-TQWT thread got me seeing L5.
Re = 7.10 for the 08S15L74.
Re = 3.69 for the 08S15L72.
Le = 6.284 for the 08S15L74.
Le = 4.085 for the 08S15L72.
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Old 4th December 2012, 09:52 AM   #89
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Sorry I didn't get those specs dug out of the manual yet. My plans seem to change constantly. It is one of the first L7s when they came out in 2002 I think. Way before they did the L5s. I had also been researching the lilmike cinema F20 but didn't want to buy a new sub. Then I saw parts express had their DVC15s on sale I got one and built that horn. Turns out the spider was not glued properly and was loose. So now I'm sending it back and wondering if I made the right choice. I'd still like to build this tapped horn too. Just wondered how simple it would be to lower the tuning frequency a bit and if it was advisable. I've never dealt with horns of any type or hornresp. I built the F20 since he did all the leg work and published plans. I know thats not on the DIY spirit.
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Old 4th December 2012, 01:06 PM   #90
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Don't know, you need measured specs to be sure, but based on the published specs I have, it has a horn BW = ~7 - 99 Hz, so can go lower, though don't recommend lower than ~13-14 Hz.

Of course the lower it's tuned, the less peak SPL across its usable BW and the lower the first notch will be, so tuning it lower may require a lower XO point.

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