Another subwoofer GTG, Southern Style - Page 6 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #51 of 56 Old 10-26-09, 02:34 PM Thread Starter
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Re: Another subwoofer GTG, Southern Style

Try modeling your driver in winisd with your same box. Input your wattage and see what the corresponding excursion level is. I am pretty sure that is a 16 hz tone. If that is the case and you have a 15.4 hz tune then the port has taken over mostly at that point meaning there is very little demand on the driver. That's probably what it is. Be careful if you don't have a high pass filter. That low tone will bottom your driver at high levels.
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post #52 of 56 Old 10-26-09, 02:59 PM
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Re: Another subwoofer GTG, Southern Style

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brandonnash wrote: View Post
Try modeling your driver in winisd with your same box. Input your wattage and see what the corresponding excursion level is. I am pretty sure that is a 16 hz tone. If that is the case and you have a 15.4 hz tune then the port has taken over mostly at that point meaning there is very little demand on the driver. That's probably what it is. Be careful if you don't have a high pass filter. That low tone will bottom your driver at high levels.
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the SSF was set to 15Hz, I believe it's 24dB/octave. Power was insane, 1700RMS (on an IB3!) and it wanted more, so I ordered a dual 2 ohm recone kit so I can run parallel 1 ohm. the amp is rated 2600 RMS @ 1 ohm, 1700 RMS at 2. I think 1700 was plenty, but the amp was clipping severely trying to do it into a 2 ohm load. I no longer have the amp or 6 batteries, I haven't completed the recone...just have to solder leads, still have the box but I retuned it to 17Hz thinking Bass I Love You was 18Hz, the lowest I wanted to go.

I'll be finishing the recone and doing some sine sweeps to check things out. Thanks again!
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post #53 of 56 Old 10-27-09, 10:59 PM Thread Starter
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Re: Another subwoofer GTG, Southern Style

I'm thinking that the link for the pics has changed on flickr. There's still a few pics on my thread over at avs. Here's a few pics. I'll try to get with the other member to see if he has a better link for the rest of the pics.
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post #54 of 56 Old 10-28-09, 11:00 AM
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Re: Another subwoofer GTG, Southern Style

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thank you! I got a LOT out of this thread, it is really appreciated. wish I couldda been there. BTW, how were the tones in "Bass I Love You" determined? reason I ask, is I have run and rerun my math on an old enclosure, it should be tuned to 15Hz but it had more excursion on the 16Hz or 18Hz tone than it did on the 25Hz and 30Hz tones. NO leaks, everything is sound.

Thanks again.
Actually the tones in bass I love you aren't a pure sine wave. The lowest one is mostly 6-8hz stuff and the next one up is 16-18hz stuff. This was determined through spectral analysis.
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post #55 of 56 Old 10-28-09, 01:44 PM
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Re: Another subwoofer GTG, Southern Style

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Actually the tones in bass I love you aren't a pure sine wave. The lowest one is mostly 6-8hz stuff and the next one up is 16-18hz stuff. This was determined through spectral analysis.
what analyzer do you use?

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brandonnash wrote: View Post
I'm thinking that the link for the pics has changed on flickr. There's still a few pics on my thread over at avs. Here's a few pics. I'll try to get with the other member to see if he has a better link for the rest of the pics.
man you guys had a CLUTTER there! I didn't realize how much Sd the LMS had to gain with the tall surround...I was expecting to be looking at the XXX with a huge fat surround in that sealed test enclosure. Thanks for the pics! I should lurk over there at AV a little more.
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post #56 of 56 Old 10-29-09, 01:45 PM
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Re: Another subwoofer GTG, Southern Style

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what analyzer do you use?



man you guys had a CLUTTER there! I didn't realize how much Sd the LMS had to gain with the tall surround...I was expecting to be looking at the XXX with a huge fat surround in that sealed test enclosure. Thanks for the pics! I should lurk over there at AV a little more.
Spectrum labs.

Actually the LMS doen't have any more SD than the XXX. The LMS frame is 18.5" and the XXX frame is 19" od. XXX has a bigger cut-out as well.
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