[Rtsr21]

Using closed cell foam on inside of door (Resonant Issues)

I'm having some really weird resonance around 125 200, making the vocals sound muddy and kinda like it echos. What can I do to help this. I have all ready put some dynomat on the inside of the door, my lp on the sub is 80, 100 on the components.

 

[Rtsr21]

I should also mention that i have a huge plastic peace that covers the front of my door, should I have sound detained too?

 

[TOOSTUBBORN2FAIL]

Closed cell foam wont help this. It should only be used in between two parts that are vibrating together and causing rattles.

 

[Weigel21]

You could sandwich a foam gasket between the speaker and the door, this would reduce some of the vibrations transferred to the door and may help slightly. Deadening the door panel may help as well, though we don't know what the source of the noise is at this time. You may want to remove the door panel and see if the system displays the same symptoms.

Are you boosting lower frequencies with your EQ?

 

[Rtsr21]

You could sandwich a foam gasket between the speaker and the door, this would reduce some of the vibrations transferred to the door and may help slightly. Deadening the door panel may help as well, though we don't know what the source of the noise is at this time. You may want to remove the door panel and see if the system displays the same symptoms.

Are you boosting lower frequencies with your EQ?

I think it would be a lot of taking stuff of just to get the plastic cover off, it covers all most the hole door, but if if there is no other ideas I might just have too. I have lowered 125 and 200 to -4 if I raise it, it sound very very bad.

 

[Weigel21]

Could be that those frequencies are causing panel resonance. Which if such is the case, deadening the door panel with CLD tiles and MLV should help dramatically.

Yeah, I didn't/don't know how muchy work is involved in removing your door panel. Often it's half a dozen to a dozen screws and the panel is then only held in place by clips, which can be broken fairly easily if the car is older or one isn't careful. Still, they aren't too expensive if you break a few.

If you had any plan to deaden the door panel you'd need to remove the panel anyways, this will at least let you know if you need/want to go through with the process of deadening it.

 

[Rtsr21]

Would it help at all to only detain just the front of the plastic panel? Car is 2012 Mazda3

 

[Weigel21]

I honestly couldn't say. It may help, it may not.

 

[chasinbass]

Door panels come off just like most other cars. Couple of trim pieces couple screws then the whole panel pops off -clipped on,and this my help ya Mazda Mazda3 Interior Door Panel Removal Guide - 2010 To 2013 Model Years - Picture Illustrated Automotive Maintenance DIY Instructions
Before you get started I would go by the dealer and pick up some clips incase any break and if they dont you will have spares. I ordered a whole bag of them for my truck so I always have some on hand when I get a wild hair to do something in my doors.

 

[Rtsr21]

im talking about removing this one. Mazda-Mazda3-Interior-Door-Panel-Removal-Guide-027

I wonder if this is causing the resonance.

 

[chasinbass]

EEEEK ! LoL ya I bet it is ! try removing speaker and put deadner all around the hole on the outside and what you can get to on the inside thru the speaker hole and that will calm it down.On mine i covered the speaker hole then cut pie shape and folded it around the inside so your mounting the speaker on deadner. If that makes any sense ?

 

[Rtsr21]

EEEEK ! LoL ya I bet it is ! try removing speaker and put deadner all around the hole on the outside and what you can get to on the inside thru the speaker hole and that will calm it down.On mine i covered the speaker hole then cut pie shape and folded it around the inside so your mounting the speaker on deadner. If that makes any sense ?

It does, I just hope someone will chime in about detaining just the outside of that plastic, i'm not so sure it will do anything but waste money.

 

[chasinbass]

Oh I am sure it will help but will be tough with all the shapes I would try it my way first and then if not you can try deadning it start with all the flat parts and also are you sure its not the outter pannel ? you can put some pieces for the back of it too. You dont have to cover every inch, try using smaller pieces first.

 

[Weigel21]

Wow, when did they start making inner door covers like that? Guess I haven't been in too many newer vehicles (or any Mazda's period), early to mid-2000's are about the newest I've dealt with, only exception a 2012 Ram.

I could see that panel resonating fairly good and causing some abnormalities in the sound. Just try to avoid covering the bolts on the panel, just in case you ever need to remove it to replace a window motor,door lock actuator, etc.

 

[Rtsr21]

Oh I am sure it will help but will be tough with all the shapes I would try it my way first and then if not you can try deadning it start with all the flat parts and also are you sure its not the outter pannel ? you can put some pieces for the back of it too. You dont have to cover every inch, try using smaller pieces first.

No i'm not sure where it coming from.

I was only able to put dynomat on the inside of the door where I could get it through the speaker hole.

Wow, when did they start making inner door covers like that? Guess I haven't been in too many newer vehicles (or any Mazda's period), early to mid-2000's are about the newest I've dealt with, only exception a 2012 Ram.

I could see that panel resonating fairly good and causing some abnormalities in the sound. Just try to avoid covering the bolts on the panel, just in case you ever need to remove it to replace a window motor,door lock actuator, etc.

Right I know not to cover anything important, I guess it should sound very good then, if I detain it right, since it practically a sealed door all ready.

 

[Weigel21]

Sounds like it's time for some hands on testing.

I'd begin with removing the door panel, as shown in the photo, and then play test tones around the frequencies you believe cause the anomaly. Once you're able to get the anomaly to reoccur, apply a little pressure to areas on the inner door skin/cover and find if any of the locations reduce the anomaly. If it does, apply some deadener to that location and retest.

That's about the best idea I can come up with at this time.

 

[Rtsr21]

Sounds like it's time for some hands on testing.

I'd begin with removing the door panel, as shown in the photo, and then play test tones around the frequencies you believe cause the anomaly. Once you're able to get the anomaly to reoccur, apply a little pressure to areas on the inner door skin/cover and find if any of the locations reduce the anomaly. If it does, apply some deadener to that location and retest.

That's about the best idea I can come up with at this time.

Yes i will try that, thanks.