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Old 30th September 2009, 11:25 AM   #1
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Default Trouser flappin bass

I experienced this for the 1st time last Sat night, on a couple of tracks at a disco with live bands. It was fun!
Yes, don’t do it often!
I’d like to get that bass capability in my house. I mostly listen to pop/ rock.

http://www.klangwirkstoff.de/html-en...cheoktave.html says
"20 Hz represents the deepest bass tone, which is just about audible.
(Hosenbeinflattern, the sound of trousers flapping in the wind)"

Apart from big organ pipes, the start of DSotM and other exceptions, not much music contains much signal at 20 Hz.
By 20 Hz, PAs are probably down about 12 dB or much more. I wouldn’t have thought it was that low.

The lowest ‘normal’ bass guitar iirc is 30 -35 Hz.

So what db and Hz do you need? 110 dB at 30 Hz?
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Old 30th September 2009, 10:09 PM   #2
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More like 140dB+ at 60Hz...
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Old 30th September 2009, 10:25 PM   #3
Glowbug is offline Glowbug  United States
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Quote:
Originally Posted by electroaudio View Post
More like 140dB+ at 60Hz...
The loudest vehicle I've ever been in was around 147dB @ 55Hz. Not very enjoyable to me, and there are people who can routinely stand 150s...beyond me, that's for sure
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Old 30th September 2009, 10:43 PM   #4
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The loudest vehicle I've ever been in was around 147dB @ 55Hz. Not very enjoyable to me, and there are people who can routinely stand 150s...beyond me, that's for sure
147dB is over 4 times louder than 140dB so that's hardly surrpising.

Oh, and to the OP, the lower E-string on a bass is 41Hz, though it can in principle be tuned lower.

Last edited by Saturnus; 30th September 2009 at 10:46 PM.
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Old 30th September 2009, 11:15 PM   #5
Glowbug is offline Glowbug  United States
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Quote:
147dB is over 4 times louder than 140dB so that's hardly surrpising.
Indeed When I used to mess around with SPL competition, I could almost touch 140 at 45Hz, but my enclosure wasn't made for it at all

Quote:
Apart from big organ pipes, the start of DSotM and other exceptions, not much music contains much signal at 20 Hz.
The exceptions are where the fun is
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Old 1st October 2009, 01:36 AM   #6
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140 to 147 dB?

btw, this was inn a large room that you’d see bands in, not the confines of a car

You really think you need that much volume to vibrate clothing??

I wasn’t wearing armour, just plain old blue denim . .
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Old 1st October 2009, 02:20 AM   #7
wg_ski is offline wg_ski  United States
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It does take about 110dB, and below 40 Hz. That's average SPL, not peak. So you need at least 10dB of headroom and a few dB for power compression - that means a system that can do 120-125dB at the listening (?) position calculated from SPL 1M/1W. This is easy at 60 or 70 Hz. Not so easy in the 30's.

When considering such large-scale systems, SPL 1M/1W approximately equals SPL at 100 ft/ 1kW. Coupled horn loaded systems can do about 115 dB/W. With 10kW of amp power, such a system can do 110 honest average dB at 100 feet. At 1 meter, it goes way beyond moving pantlegs. More like feeling a shockwave - it makes you queasy and you can hardly stand up straight. Use OSHA-approved hearing protection when attempting this (seriously - ears COVERED!!) I've done this with four labhorns - I've never had the nerve to get that close to all 8. What test track? AC/DC, "You Shook Me All Night Long", played though a subharmonic synthesizer.
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Old 1st October 2009, 03:31 AM   #8
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"You Shook Me All Night Long", played though a subharmonic synthesizer.


"It does take about 110 dB, and below 40 Hz"
You have live sound experience, great! (I'd considered finding a pro sound forum, but prefer to post here).

So do you think 110 dB (+ headroom and for power compression, at the listening ) place) . . . at *30 Hz?

Dub reggae is very bass heavy, but I think that’s more like 50 -100 Hz.

Maybe amongst broad pop/ rock, electronic goes the lowest in frequency?
To not “miss anything”, to what Hz would it be good to have that dB capability?

Last edited by otto88; 1st October 2009 at 03:42 AM.
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Old 1st October 2009, 10:06 AM   #9
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Quote:
Originally Posted by otto88 View Post
140 to 147 dB?

btw, this was inn a large room that you’d see bands in, not the confines of a car

You really think you need that much volume to vibrate clothing??

I wasn’t wearing armour, just plain old blue denim . .
Two labsubs mounted beneath the stage with one channel of QSC EX4000 for each driver, highpassed att 55Hz (48dB digital+12dB analog/oct) will move my pants.
One decent 2x18" can get 133dB and a small room has a very different behaviour compared to outdoors.
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Old 1st October 2009, 10:35 AM   #10
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Originally Posted by otto88 View Post
By 20 Hz, PAs are probably down about 12 dB or much more. I wouldn’t have thought it was that low.
Not 12dB, more like 50-70dB.
A normal BR box will fall off very rapidly by itself, add a standard 48dB/oct hipassfilter for protection and there wont be much left at 20Hz.
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