Seems that the feedback has been pretty unanimous that sound deadening improves the perceived sound and mitigating resonance. I'll be doing this soon as well. My approach has been doing things in phases so I can assess the progression of improvements.
If you don't mind me asking, which sound deadening materials did you use and where did you apply them? Similar to the others who have done this mod, I'm assuming?
Hi jpl29,
I decided to use products from Second Skin Audio. I used the following:
Damplifier 1 MM on the doors and inside rear quarter area – 20 Sq Ft total
https://www.secondskinaudio.com/sound-deadening/damplifier
Damplifier Pro 2 MM on the rear bulkhead – 4 sheets total
https://www.secondskinaudio.com/sou...eQNBV-kT1fpQv8sfhUwGSYCuqwdso4woaAlmKEALw_wcB
Mega Zorbe Hydrophobic Foam – Peel and Stick – 3 Sheets total
https://www.secondskinaudio.com/sound-absorbing/mega-zorbe-foam
Thanks to
@crestima and
@KJWEmira for their advice along the way, they were the trailblazers and provided me a lot of information, some of which is in the details below.
I began with the interior of the doors and the door cards. These come apart more easily than expected and go back together pretty well also. You do need to unclip all the wiring to remove the door cards and remove the 3 bolts holding the window motor on and remove the door opener bit to completely remove the card. Those window motor screws were the trickiest part for me when it came to the reinstall. I installed the regular Damplifier inside the doors cutting each piece in about a 10-inch sections to maneuver them into the door cavity. I worked my way from the front of the door to the back. There is some wiggle room when installing the Damplifier, you can move it around a bit before it is pressed in place for good. I would guess I covered 85-90% of the inner area of the exterior door panel. Because of my OCD, I went back and filled in some areas on the doors that you don't see on the pictures
The door cards are much more tedious if you take the path of cutting out each little section as I did. I used a 6-inch-wide blue painters tape to make a template for the pieces using a sharpie. The 6-inch tape lets you make more pieces at one time. There may be a better way to make a template, but this worked for me. You can cut the Damplifier product with ordinary scissors which is helpful. You can cut holes with any type of utility knife. The holes are a bit of a pain. I fully covered the entire door card grid sections which allows the panel to be as serviceable as it was before. This took a while, but I could do it in my spare time in my kitchen. I used about 3 pieces of the 1MM Damplifier on the door cards and the rest was used for the interior of the door and rear quarters.
I then put the 1MM Damplifier in the rear quarter areas and put some on the sub box and the metal brackets for the speaker and amp mounts. I covered this area also about 85-90%. I also made the pressure relief piece which is next to the sub fit better, I’m sure that was adding some noise before, and may still be. Interestingly, there was no hole cutout behind my subwoofer like I have seen on other pictures that show the sub removed. Maybe a running change? A word of caution when removing the brackets for the amps and speakers in the side where the sub is installed. One of the amps has 4 small plastic spacers behind it that will fall down and get lost in the lower area of the rear quarters (ask me how I know). Two of the bolts for the amp need only to be loosened to remove the bracket as they have slots rather than holes for the mount. The other two bolts need to be removed so grab the spacers when you remove the bolts. The other side where the fuse box is does not have spacers but do be careful not to drop the bolts. Working in the back area can be difficult as it is very tight and you do need to be a contortionist to access some areas.
At this point I thought I was done, I had not planned to put the sound deadener on the rear firewall. After thinking about it though, and realizing the engine was literally right there I had a change of heart. I decided to order the thicker Damplifier Pro for that area and at the same time decided to add the Mega Zorbe (some name) insulation to the rear quarter area. I figured I only wanted to take the car apart once for this. I had the doors back together and was not going to take them apart to add the Mega Zorbe insulation. I completely covered the rear firewall after temporarily removing the stuck in place factory sound deader piece. then I applied the peel and stick Mega Zorbe insulation in the rear quarter areas and around some areas of the firewall that were not covered by the factory insulation. This product was easy to work with. I cut smaller 5- or 6-inch sections and pieced it all together. It is easy to fill in gaps with this. I found it was also not quite a sticky as some reviews show and had no real problems with this install.
Collectively all the products quiet down the interior a lot. I’m excited to get it on the road soon to feel the real-world impact. Whether adding a sub or not I would highly recommend this type of product. I added about a total of 15 pounds of material which will be offset by the anti-gravity battery once I purchase and install that.
The doors now also sound like a Porsche when they are closed which is a big uptick.
Good luck on your install.