Who Sits In The Trunk When They Drive? Acoustic Treatments To Block Off Trunk? - Car Audio Classifieds!
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Old 08-12-2012, 04:16 AM
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Default Who Sits In The Trunk When They Drive? Acoustic Treatments To Block Off Trunk?

Apartment dwellers will testify that "bass notes" are more distinctly heard from music played in nearby apartments VS frequencies farther up the spectrum.

Why is this?

Well, the natural frequency of large walls, floors, and ceilings is lower than the natural frequency of smaller surfaces.

Okay, so the logic seems on, but I don't quite understand. Just exactly what frequencies are we talking about.

Here:

Assume you have two rooms divided by a wall. In one room, a test sweep (20khz TO 10hz) is being played at a constant volume (db). You are standing in the other room. Assume when the test sweep starts, the volume is too low to be audible. As the test sweep plays, the frequency lowers, & at point X, there should be an audible noise.

Well, what frequency is "point X?"

But 05LGT, there is no "set frequency" as all objects vibrate at a different frequency. But wait, wouldn't that be called the "natural frequency?"

Okay, well how do we figure the "natural frequency" of an object.

Wouldn't that be kind of impossible? I mean nothing can vibrate on itself. The wall sure can't. The speaker would be causing the wall to vibrate. So, in order to calculate the "natural frequency" of an object, one must take into consideration the "thing" that is causing the object to vibrate?

Is there a function on how to calculate this?

Theoretically, the speaker should be able to vibrate the wall at any frequency the speaker is putting out, correct?

But, we just said that the natural frequency of large walls, floors, and ceilings is lower than the natural frequency of smaller surfaces. What are these smaller surfaces?


I'm confused

Sure, sound waves travel just fine through walls. Okay, so why do subwoofers sound so much better in the cabin of a vehicle vs in the trunk. I'm not pointing out any exact make/model of a vehicle. It's just a given.

What happens to these frequencies? Do they get interrupted? Distorted?

I plan on firing a subwoofer through the rear deck of my 4 dr sedan & sealing it off underneath. I want to keep as much sound as possible inside the cabin, therefore wouldn't it make sense to seal off the trunk of the vehicle to keep all "sub bass" frequencies inside the cabin? Is this possible? Or is it only possible down to "X frequency?"
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Old 08-12-2012, 04:32 AM
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inb4 paradox
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Old 08-12-2012, 08:06 AM
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Everything can vibrate by itself, you just can't register it by human perception. In a solid matter, the atoms are tightly packed and vibrate due to the electrons moving around the nucleus. The natural resonant frequency is the speed at which the atoms vibrate.

Subwoofers "sound" better in the cabin because none of the frequencies are being filtered or cancelled out by the natural resonant frequencies of the materials they are moving through.

There is a much more scientific explanation but I only have the motivation to provide cliff notes.
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Old 08-12-2012, 08:12 AM
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let's deaden everything..


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Old 08-12-2012, 08:17 AM
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Quote:
Originally Posted by iamsonic View Post
let's deaden everything..


You could try stopping the electrons from moving to cancel the natural frequency. Though I'm not sure if you'd have the object simply disappear or you'd open a black hole....
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Old 08-12-2012, 08:35 AM
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Quote:
Originally Posted by iamsonic View Post
let's deaden everything..



Was that a joke?

You'd think if a moderator were to post a response, it would be reasonable.

I know acoustic treatments are used quite a bit up front, but has anyone bothered w/ the backing of the rear seats & rear deck?
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Old 08-12-2012, 02:11 PM
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so what are u asking? how to find out what freq didnt shit vibrates at? theres so many different factors in that questions. its gunna be easier to vibrate plastic peices then metal in your car.
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Old 08-12-2012, 02:14 PM
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Quote:
Originally Posted by 05LGT View Post
Was that a joke?

You'd think if a moderator were to post a response, it would be reasonable.

I know acoustic treatments are used quite a bit up front, but has anyone bothered w/ the backing of the rear seats & rear deck?
dont get crazy
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Old 08-12-2012, 02:27 PM
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actually every thing in the known universe vibrates by it's self, the complete cease of movement would cause an affect called absolute zero, which is the very bottom temp something can achieve, some where in the realm of -450 degrees celcius, which unless I am mistaken scientist have not been able to achieve.
I'm not exactly sure what you are proposing by blocking off your subwoofers inside of your trunk, it will lose out put that way.
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Old 08-12-2012, 03:50 PM
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Thanks for the responses guys.

"Firing into the cabin" is basically "directing," correct?

Why not direct as much of the "sound" as possible in the direction you wish for. In this case, the cabin of my sedan.

Is it possible to direct "sub bass" frequencies? -This is why I wanted to know the "natural frequency" of a wall. In this case, the rear seats of my vehicle.

Here's my dilemma. I have never been pleased w/ how a subwoofer sounded in a vehicle. Perception of depth always lacked as well as detail. In my home, it's a whole different story. My little 6" Tang Band sounds soo much better in my home theatre system. It's so surreal! Every little detail is audible, steps, cracks, anything! I try to duplicate that in my vehicle, & I never can get it right. It's almost like, I have to appropriately tune ea/ song accordingly in order to get as much depth & detail as possible. However, when I move to the next song, the bass is either lost or is boosted wayy too much. I can't get the median right.


I want to bring forward the depth, & hear detail. Firing the subwoofer into the cabin would be a great step. Why not take it further & block sub bass frequencies in the opposite direction? I have not studied acoustics, but it'd make sense that the smaller the cabin, the "louder" it'll be, correct? I mean, there will be no loss of "sound." The trunk to me, seems like a huge loss of sound.

Is this true?

So, is it worth it to treat the rear seats & rear deck of my vehicle w/ acoustics treatments to "block" off sub bass frequencies, so more "sound" gets directed into the cabin of my vehicle. -LOL. But really, ha.

Last edited by 05LGT; 08-12-2012 at 03:53 PM.
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