5-15hz output. ?? - Page 2 - AVS Forum | Home Theater Discussions And Reviews
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post #31 of 39 Old 12-23-2014, 03:59 AM
 
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I just noticed you said you don't care about distortion.


In that case you could get nearly the same output with only 24 subs and 12 amps with 12cuft per speaker.
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post #32 of 39 Old 12-23-2014, 05:30 AM
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@More is Better You are crazy man! Lmfao!
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post #33 of 39 Old 12-23-2014, 05:36 AM
 
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@More is Better You are crazy man! Lmfao!


Thank you
Glad I could make you smile this morning.


Besides Ummm, it's about the only thing that will definitely meet his requirements.
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post #34 of 39 Old 12-23-2014, 07:11 AM
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That is not needed for 130 dBs at 10hz. Notnyt did it with his sealed 8 LMS drivers and Ricci does with his 8 XXX 18 inch drivers. I do it as well with 12 SI 18's and one clone amp. There is no need to get crazy as it depends on the room. I hit 110 dBs at 10hz last night with a sweep at 0.8% THD. The bad thing is that is supposed to be a 5 dB hot sweep at 100 dBs. Running a little hot.

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post #35 of 39 Old 12-23-2014, 07:15 AM
 
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That is not needed for 130 dBs at 10hz. Notnyt did it with his sealed 8 LMS drivers and Ricci does with his 8 XXX 18 inch drivers. I do it as well with 12 SI 18's and one clone amp. There is no need to get crazy as it depends on the room. I hit 110 dBs at 10hz last night with a sweep at 0.8% THD. The bad thing is that is supposed to be a 5 dB hot sweep at 100 dBs. Running a little hot.
It's exactly what you need if you don't want to take a guess as to what the room gain will be.
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post #36 of 39 Old 12-23-2014, 07:30 AM
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10hz != 5hz, it all depends where he wants to draw the line.
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post #37 of 39 Old 12-27-2014, 12:23 PM - Thread Starter
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Hey guys thanks for the input . Now with SEALED enclosures . It seems I need EQ to increase the dip below whatever my boxes tend to fall off .. So if my sealed enclosure falls off 12db starting at 35hz and I want more 10hz output and I have 12mm of xmax left , then what Q setting should I do for the parametric EQ and also how much boost . Since boost is relative to amplifier power draw. ?? I know EQS are more meant to flatten any peaks primarily but what about the dips after REW has been accounted for ??
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post #38 of 39 Old 12-27-2014, 12:37 PM
 
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I would use a sealed sub to measure your room gain profile.


Then you can answer the question of how much and where you need to boost in YOUR room. If you get the full 12db/octave gain from room gain, and a 12db/octave loss from the sealed box then your response is flat with no boost. Even though it looks like the winisd plot is way down at 5hz.
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post #39 of 39 Old 12-28-2014, 08:11 AM
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Room gain varies by frequency. You may get good gain at one frequency and losses at another. Playing with the Q for a broad increase in energy/power is the the best way in my limited experience to see what spl gains can be made in the low registry. A low shelf filter is another option. Both options have to be monitored closely for driver and amp tolerance.

At some point it is better to abandon spl gains in the low registry and shoot for a a little more sound spl higher.

I have also used low registry boosting due to being in a 53-5600 cu ft. space with little room gain.

Last edited by derrickdj1; 12-28-2014 at 08:14 AM. Reason: add to post
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