Annoying sounds from cars at stop light

viridian you better watch what you say, that is probably my kids you are talking about.............

The bass must sound louder outside the owners car then in it or they would get sick at their stomach. 

I wonder if they put a little dampening behind the drivers if that would help.

dill

The noise that we hear is not from the front of the driver. 

dweller

In Texas you can be shot.......

I was driving with the stereo on, put my hand out the window, ( the left hand not the right hand ) and felt the door panel. It was resonating like crazy and the volume was not turned up. So that got me thinking which for me is a lot more difficult then it seems. 
We all know that for every action there is an opposite and equal reaction. As it regards speakers this means that the sound off the back of the drive is equal to the sound coming off the front. 

gdnrbob

Well you have hit a nerve. I majored in English.  English Lit. 

Thanks for the correction. Would you mind editing my posts, the pay sucks but we offer health care and a pension plan. 

So these stupid drivers are only 6". I would postulate that the waves coming off the back directly towards the metal sheeting on the door get that resonating and perhaps at a much lower frequency then the driver is producing, remembering that larger more massive objects at a lower frequency. 

So now we have speaker the size of a car door pumping out bad bass. 

dill 

You are correct about very low bass notes having very long waves. Not sure those 6" speakers in the door or even a 12" sub in the trunk are pumping out 30Hz bass loud enough that I can hear it from my car in open air.

Here is a thought: If the area of the exterior of the car is 100 times larger then the area of the drivers then if it moves with only 100th of the energy of the drivers the volume will be equal to that of the driver. 

I wonder if that same physics would apply to your loud speakers at home. 

.01% of the rear energy to equal the volume of the drivers. Scary thought. At least to me. Apparently not to speaker makers.

So here is a point I would like  to make.

I don't think those low frequency really travel through those walls in your home. 

I would offer this, the waves from the driver hit the wall, they cause the wall to vibrate/resonate and because the wall is much larger then the driver it amplifies the sound. 

geof

You are correct about the sound waves. In your room they travel through the air, when they hit the sheetrock they are traveling through a different medium which has a different speed through which those waves travel, then air again 3.5" then the sheetrock again, then into the air again. Lots of moving parts. 
I was trying to discover the speed with which air travels through sheet rock but couldn't locate that info. I did find info that suggests that the resonance of sheet rock is about 70 hz which is probably why we hear louder bass on the other side of a wall and why that is so distorted. 

I would bet the MDF used in most speakers does much of the same.

gaddodge

You are doing Gods work............except for the exhaust fumes........not sure he would approve....

kidding about that...

I don't think they hear it. They are listening to the speakers facing them, you are listening to the whole car resonating and turning into a huge speaker. Maybe we should have posit notes preprinted that say " Please turn that music down, I have a baby sleeping on the floor." 

Wonder if that would work. Probably not...

I am going to do an experiment. My son has a sub woofer in his trunk. I am going to take it out and put it on the grass, turn it up and see what happens. 

Any guesses???????

ct0517

He is  always pissed anyway........................

I have a bunch of lamp cord, about 40 feet. As much as I would love to tear that &(*)(())  out of there, being a very disillusioned  parent, they told me how great it is to have children, I will never listen to them again, I hesitate to get the crowbar.

Those should rattle the room.....

Ok

I did my experiment. I put the subwoofer out on the yard and cranked it up............I mean 1000 watts of heart thumping power....well it was pretty loud but not over the top and still pretty clean and not irritating. 

Well I put it back in the trunk and cranked it up again and in about a10 minutes the police showed up.....

Is Verdi a rap artist? I should google him

I found an old car door in the junk yard that had a car speaker in it. Took it in my listening room and guess what???????????.  I couldn't get the door open, no, not that. The should was better then my Vandy's and my wilson audio's.  Just kidding.....

I hate old people period............even more when I look in the mirror....they are horrible......

geoffait

Not sure the waves travel through the walls. They make the wall vibrate and move. The energy from the waves is transferred to the wall. Then depending on the composition of the wall it will respond accordingly. 

I would agree Elizabeth. Pretty accurate read on the issue. Sound waves are altered, Some frequencies don't fare well in sheet rock and lose amplitude. Others, like the dreaded 80Hz bass notes, ( those lease busters ) get amplified. 

I had one of those cars and when I went to the gas station all I heard was a guzzling sound.........

Just kidding. 

Were the mattresses there to keep you from hurting yourself??????

I am still stuck at that same stop light....the noise is not getting any better. The whole car next to me is vibrating....would make a good bed perhaps...

stevecham

You are so right.....absolutely correct.....