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Old 01-31-2019, 04:20 PM
 
840 posts, read 1,000,815 times
Reputation: 1757

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Let me preface this with saying I am NOT complaining, nor is this is a "those darn whippersnappers and thier loud noise they call music!!!!" post I am genuinely curious how this was even possible....

So I'm sitting at an intersection waiting to head north. There's a Chevy Suburban heading west, waiting in the turn lane for a minute or two, eventually passing me headed south. While I was waiting, I suddenly feel an intense, low frequency vibration. No noise, just vibration. I felt it throughout the truck. At first I thought something was wrong with my truck, then I looked up and saw things vibrating around me. I seriously thought we were in the middle of an earthquake. It was that intense.

As that Suburban passed me, I realized it was the stereo system in that thing that was causing all this. I've been around loud stereos, and high wattage subwoofer systems most of my life (I'm 39 now). I was one of those whippersnappers with a wall of 15s and thousands of watts of power in my truck. I know what big subs are capable of, but I've never seen sub performance like this before in a mobile environment, where it was nothing but vibration without sounding like the car was going to rattle itself apart, short of a full blown unlimited class car, and those aren't something that's getting driven through town. It also wasn't loud at all either, though I could hear that he was playing some kind of electronic music...just felt vibration.

As someone who is fascinated with how things work, I'm just wondering how this was even possible...I've tons of dynamat in a car before, but even then, things like fenders, license plates, and window glass still tends to rattle. And if not in his truck, certainly I would have heard something in my own?
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Old 01-31-2019, 04:37 PM
 
1,236 posts, read 893,144 times
Reputation: 2879
If a person was into investing, he should buy some stock in a hearing aid company. The day's coming when a lot of people's hearing will be severely damaged, if not gone. It doesn't seem like the younger generations can listen to music without it being turned to full-blast. Not that I consider what you're describing as music, but some seem to consider it as such.
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Old 01-31-2019, 04:38 PM
 
Location: Aurora Denveralis
5,181 posts, read 1,711,378 times
Reputation: 7807
All else aside, resonance. Maybe someone in a different vehicle wouldn't feel it quite as strongly, and maybe the exact combination of frequencies and resonance bulked it up.

There is a coming thing in "sirens" that projects a low-frequency rumble that can be felt inside most cars, even those with great sound insulation and a (normal) stereo on. I think it's called the Rumbler.
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Old 01-31-2019, 05:36 PM
 
Location: Brawndo-Thirst-Mutilator-Nation
15,791 posts, read 15,786,920 times
Reputation: 11678
It's acceptable to blast super-amplified noise from a vehicle, no ticketing or any enforcement is
done......so of course things quickly get out of hand.

Give an inch and many Humans will take 10 miles, then some.
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Old 01-31-2019, 06:06 PM
 
Location: MN
2,961 posts, read 2,728,395 times
Reputation: 2294
I felt one last summer in my work truck. It shook my side mirrors and my rear view mirror. My whole interior shook and it was a Suburban was two lanes over at a light. I rarely hear loud stereos anymore, I always had a sub or two in all my vehicles. Now my stock bose system is good enough.
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Old 01-31-2019, 06:10 PM
 
10,162 posts, read 14,575,929 times
Reputation: 11236
There's device called SHAKER. It is not really a speaker, though works similar.
It's low frequency driver bolted directly to the body. Usually, as they are quite small, under the car seats, so you feel it up your....

That could have been just that. Four shakers will vibrate the entire metal box.


https://www.amazon.com/AuraSound-AST.../dp/B0002ZPTBI
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Old Yesterday, 06:05 PM
 
Location: Louisville KY
4,138 posts, read 3,710,293 times
Reputation: 3290
Quote:
Originally Posted by urbex View Post
Let me preface this with saying I am NOT complaining, nor is this is a "those darn whippersnappers and thier loud noise they call music!!!!" post I am genuinely curious how this was even possible....

So I'm sitting at an intersection waiting to head north. There's a Chevy Suburban heading west, waiting in the turn lane for a minute or two, eventually passing me headed south. While I was waiting, I suddenly feel an intense, low frequency vibration. No noise, just vibration. I felt it throughout the truck. At first I thought something was wrong with my truck, then I looked up and saw things vibrating around me. I seriously thought we were in the middle of an earthquake. It was that intense.

As that Suburban passed me, I realized it was the stereo system in that thing that was causing all this. I've been around loud stereos, and high wattage subwoofer systems most of my life (I'm 39 now). I was one of those whippersnappers with a wall of 15s and thousands of watts of power in my truck. I know what big subs are capable of, but I've never seen sub performance like this before in a mobile environment, where it was nothing but vibration without sounding like the car was going to rattle itself apart, short of a full blown unlimited class car, and those aren't something that's getting driven through town. It also wasn't loud at all either, though I could hear that he was playing some kind of electronic music...just felt vibration.

As someone who is fascinated with how things work, I'm just wondering how this was even possible...I've tons of dynamat in a car before, but even then, things like fenders, license plates, and window glass still tends to rattle. And if not in his truck, certainly I would have heard something in my own?
He probably had actual subwoofers, which are low frequency speakers. People tend to call all these types of speakers subwoofers, when most of them aren't subwoofers at all, they're just woofers. Your cheap home entertainment system, the subwoofer is probably a woofer, every bookshelf stereo that you'd see in best buy or walmart; woofers. Those 300+lbs cabinets with 15"+ speakers that flank the stage at a concert... those are actually subwoofers. Actual subwoofers generally work on negative ohms, the lower, the more punch. But... people call subwoofers and woofers, subwoofers. True woofers typically work at frenquencies so low, that you can't hear them as much as you can feel them, they produce sound too low for human ears range, so all you feel as pressure. Those Sony Explods you got at Pep Boys; they make an audible sound and are not true subwoofers.

Last edited by JaxRhapsody; Yesterday at 06:13 PM..
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Old Yesterday, 06:09 PM
 
12,680 posts, read 8,640,137 times
Reputation: 4147
Mine do in my bedroom in my A/V system
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Old Today, 05:23 AM
 
Location: Podunk, IA
3,095 posts, read 1,412,259 times
Reputation: 3199
Quote:
Originally Posted by LKJ1988 View Post
Mine do in my bedroom in my A/V system
I used to have one in my living room that would do that before I moved into my condo.
I had pictures fall off the wall during certain movie scenes.
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