Your Home Theater ULF Score - Page 71 - AVS Forum
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post #2101 of 2109 Old 07-07-2014, 09:08 PM
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Originally Posted by ahmedreda View Post
Josh Ricci tested the SVS SB-13 for audioholics. http://www.audioholics.com/subwoofer...r/measurements
Interesting it didn't get a passing result for 25Hz and below because of THD.
the sb13 had a passing output down to 10hz. All the green means is amp limited vs orange thd limited.
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post #2102 of 2109 Old Yesterday, 08:18 AM
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OK, so I ported my IB to see what would happen. I have yet run a movie on it as it was too late last night but after the sims and then running in room responses my response from sealed to ported has not really changed except I have a taller and wider peak from 6-9hz. That's what happens when you tune very low. My score is the following:
5hz: 47


7hz: 23


10hz: 47


12.5 hz: 63


16hz: 63


I am building my enclosures for my surrounds tomorrow and I am either adding 4 f my drivers or two FTW-21's tuned to 7hz. My front wall is tuned to 7hz as well.
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post #2103 of 2109 Old Yesterday, 08:30 AM
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Originally Posted by MKtheater View Post
OK, so I ported my IB to see what would happen. I have yet run a movie on it as it was too late last night but after the sims and then running in room responses my response from sealed to ported has not really changed except I have a taller and wider peak from 6-9hz. That's what happens when you tune very low. My score is the following:
5hz: 47


7hz: 23


10hz: 47


12.5 hz: 63


16hz: 63


I am building my enclosures for my surrounds tomorrow and I am either adding 4 f my drivers or two FTW-21's tuned to 7hz. My front wall is tuned to 7hz as well.

Nice response! What are your impressions so far going from sealed to ported? I know you haven't gotten a chance really test it out though.
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post #2104 of 2109 Old Yesterday, 08:58 AM
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Not known yet, I should have a major bost from 5-12hz according to the sims and my response is flat from 10-120hz. My 5 hz is the same as my 80hz but I have a 10 dB peak starting at 5-9hz, peaking 7-8hz. I can not do anything about that.
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post #2105 of 2109 Old Yesterday, 05:23 PM - Thread Starter
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Originally Posted by MKtheater View Post
OK, so I ported my IB to see what would happen. I have yet run a movie on it as it was too late last night but after the sims and then running in room responses my response from sealed to ported has not really changed except I have a taller and wider peak from 6-9hz. That's what happens when you tune very low. My score is the following:
5hz: 47


7hz: 23


10hz: 47


12.5 hz: 63


16hz: 63


I am building my enclosures for my surrounds tomorrow and I am either adding 4 f my drivers or two FTW-21's tuned to 7hz. My front wall is tuned to 7hz as well.
Awesome stuff MK! Those are some crazy scores! I cannot wait to hear your impressions...although, it won't be an apples to apples comparison since you have that peak below 10hz. Can you EQ that out?

Also, can you post your sims compared to SI? I'll update my calculator and get you your ULF Score Card.
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post #2106 of 2109 Old Yesterday, 06:49 PM
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When I get to the office tomorrow. I can't EQ out the peak because it is the result of a 7hz tune and 20+ dBs of room gain. I am always flat with sealed so porting around there will always result in a peak at LP. My DTS-10's were tuned at 14 hz according to Ricci and that gave me a peak starting at 10-15hz and dropped off at 9hz. The peak is 10 dBs over 5 hz but like I said, 5 hz is equal to 80hz so without that peak I would have a -5 dBs point at 4 hz being flat to 5hz. The 5-9hz peak makes it look like the -10 dB point is 5 hz. Either way I have all the low end of my IB plus more output but I will check in a bit. I want to test to see if I could feel the wind from the massive twin 12 inch ports!
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post #2107 of 2109 Old Yesterday, 06:56 PM - Thread Starter
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Originally Posted by MKtheater View Post
I want to test to see if I could feel the wind from the massive twin 12 inch ports!
Where's the pics???
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post #2108 of 2109 Old Yesterday, 07:18 PM
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Soon, testing now, WTF! I have not hit the big boys yet.
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post #2109 of 2109 Old Yesterday, 08:43 PM
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Originally Posted by MKtheater View Post
Soon, testing now, WTF! I have not hit the big boys yet.
Let's see some before/after measurements!
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