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post #1 of 13 Old 06-14-2014, 07:25 PM - Thread Starter
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ULF listning habits

I know a true measure of DIY subs are less than 20hz frequencies, but while hitting 10hz and under is nice, honestly how often do people listen to them/ how long do they appear in movies and at what SPL? i.e. a passage of 5 seconds or something,

I would realize that 115 Reference level is a peak, but at a certain high level low frequencies cause structural damage (not always a bad thing in this crowd)

I am guessing that the damage is room dependent, but as a general rule of thumb, around what level would you say is dangerous for ULF?
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post #2 of 13 Old 06-14-2014, 08:00 PM
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Could you cite an example of someone causing structural damage (not cosmetic drywall cracking) by playing ULF at 115db or less?

For an idea of how much ULF there actually is, I'd take a look at the databass forum. There's a group of guys who get spec lab measurements on all the big hits and they sorta describe how much ULF there is. Despite the relatively short durations these scenes make up, they represent something worthwhile to many DIYers and other bass heads alike. The durations might only make up 1% of a soundtrack and add nothing to a plot, but they add realism, fun, wow factor, etc. Personally I do it for the realism. But I only get to 10hz due to system roll off. The wow factor is at 20 to 30 hz if you ask me.
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post #3 of 13 Old 06-14-2014, 09:06 PM
 
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I don't think you have to worry about "dangerous" levels of ULF unless you have dozens of subs and amps and many dedicated circuits, or if you live in a house built out of mud.
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post #4 of 13 Old 06-14-2014, 09:26 PM
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Quote:
Originally Posted by Ross Kirshner View Post
but at a certain high level low frequencies cause structural damage
Righto. Evidence of it actually happening?
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post #5 of 13 Old 06-14-2014, 09:27 PM
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All I've done is flex walls and crack drywall.... knocked stuff off the walls....
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post #6 of 13 Old 06-15-2014, 01:14 PM
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Sh*t like this, and I'm on a slab! Also, all my door mill work is split at the joints. Only six SI 18s did that. On another note-... picture uploader can't be fixed soon enough!



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post #7 of 13 Old 06-15-2014, 01:17 PM
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Impressive but I'm not sure the collapse of some over loaded particle board shelving is what if called structural destruction.
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post #8 of 13 Old 06-15-2014, 01:34 PM
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Originally Posted by tuxedocivic View Post
Impressive but I'm not sure the collapse of some over loaded particle board shelving is what if called structural destruction.
They aren't overloaded at all. If anything they could have been hung better, as they are now. What happened is the vibrations rattled the cabinets off their backs. The backs were attached with small nails, lots of them. I'm sure you know the design. They all fell at once because they were all three connected.

It's not structural damage, but an example of what ULF stuff can do.

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post #9 of 13 Old 06-15-2014, 04:08 PM
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I've heard of aircraft causing this over decades of time.
http://www.vosizneias.com/13563/2008...tles-over-jet/
Not sure how many db's it was.

In my old system with just 5 18's I was able to loosen the drywall on the ceiling to the point where it started to creek loudly. Could have just been a very poorly built section.
I've also knocked remotes and cups off of endtables (full of cola onto the floor etc etc).
I've never knocked a picture off of a wall yet (that I know of).

In my current system I can knock the popcorn seasonings off the popcorn-maker and beer of the beer-fridge, but that's like 14 subs at 120db continuous for hours and hours.
(The fridge and maker are made out of thin sheet metal with no bracing so it flexes.)

My entire building shakes and flexes, the inner wall is nearly 2 inches thick of solid drywall on all 5 sides sitting on a cement foundation.
This was with only my quad LMS's going.

The -3db point of my system is currently at around 5hz, which is as low as I could ever really care to go (until rotary woofers become mainstream).
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post #10 of 13 Old 06-15-2014, 04:26 PM
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^^ I though you double retired?
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post #11 of 13 Old 06-15-2014, 04:33 PM
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^LOL I would hit the like button but that appears to not be working again.
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post #12 of 13 Old 06-15-2014, 09:07 PM
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Structural damage? What's that?

I'm hitting 115+ db at 8-10 Hz and can't feel anything in adjacent room.......sitting at MLP in theater is another story.
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post #13 of 13 Old 06-15-2014, 10:08 PM
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I though you double retired?


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