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Author Topic: 146.8db  (Read 1740 times)

Steve-White

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Re: 146.8db
« Reply #10 on: March 30, 2020, 10:54:38 pm »

Total BS....If they had a real broadband 146 in that room they probably would have bolted long before reaching that point -even with the plugs in
Exactly, they couldn't tolerate 130db for long, let alone 146.
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Caleb Dueck

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Re: 146.8db
« Reply #11 on: March 31, 2020, 01:33:06 am »

Exactly, they couldn't tolerate 130db for long, let alone 146.

It's not full range at that SPL though, just bass. 
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Miguel Dahl

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Re: 146.8db
« Reply #12 on: March 31, 2020, 11:56:13 am »

I once measured a noise musician to about 126dB peak C weighted when I didn't reach the mute button before he pulled out his jack. That was just pulling out a jack.. Haha. So 146 if it's unweighted (Z) seems to me at least somewhat possible when being loud as sh*t is the goal in the low range.

I wonder what a VLFC would measure going full tilt unweighted. It's below our hearing, but it's still energy.
« Last Edit: March 31, 2020, 11:59:02 am by Miguel Dahl »
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Art Welter

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Re: 146.8db
« Reply #13 on: March 31, 2020, 02:51:21 pm »

I wonder what a VLFC would measure going full tilt unweighted. It's below our hearing, but it's still energy.
Not to get into the semantics between hearing and feeling, but most people can detect LF above a threshold of around 90 dB at 16 Hz. Reaching about 125dB at 16 Hz sounds about as loud as 80 dB at 1kHz.
The Meyers VLFC  is rated 125.5 dB (Linear Peak SPL, with crest factor >10.5 dB (M-noise) somewhere in it's passband of 13-30 Hz.
My guess is it has a bit less output than JTR's Captivator 4000-ULF, which can do around 130dB at 30 Hz.

JTR is using 18" 60 pound woofers with as much as 33mm Xmax, almost double the displacement of the better "long throw" drivers used by most companies. Getting 146.8 dB SPL down low with room gain from 9 of those monsters is completely possible, as Ivan said "That's not really all that loud for a "good" home theater".

Art

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Steve-White

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Re: 146.8db
« Reply #14 on: April 03, 2020, 08:36:26 pm »

^^^ I'm going to have to put on the muffs and crank up the JBL MD7 in my den and measure it.  Without hearing protection, regular listening to music when I turn it up,it gets uncomfortable after about 10 minutes of exposure to the point of turning it down or walking out of the room.  I have no idea where my threshold is.

Need to move the second one in there - loaded with JBL 2245 18's.  Just one of them will hammer me pretty good standing 10-12' in front of it.

I doubt it's anywhere near 115db.
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ProSoundWeb Community

Re: 146.8db
« Reply #14 on: April 03, 2020, 08:36:26 pm »


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