I believe not. The speaker screws in from the outside. You don't have to "cut" through the insulation, you just lift it up so you can get access to the speaker. Then just duct tape it when you put it back to be safe. That's what I did.
I lifted it when I installed mine but just stuck it back in place without using duct tape. That it was a brand new car and in warm summer temperatures may have had something to do with my success, so YMMV.
I also installed the Alpine SPS-600 speakers ($64 w/shipping on eBay). I cut the insulation foam in a X pattern (rather than a cross "+") so the ends of the cuts were right over the mounting screws. To make sure the duct tape went on nice and flat, I first used some brush-on Krazy Glue to seal the cut. I started by pinching together two of the adjacent corners at the center of the cut after dabbing a little Krazy Glue on the edges and then over the top of the seam for about 1/2". It joins quickly and I was careful not to glue it to the back of the speaker magnet. I did the same thing on the other two pieces and then joined the two halves at the middle, lining up the cuts. Once the center was held together, I continued pinching and gluing down each seam to the end of the cuts. Altogether, it took maybe 4 minutes. I considered leaving it at that, but decided to secure it with the duct tape. With everything perfectly flat, the duct tape went on nicely. I cut round ends on the duct tape so there were no ragged edges or corners. Probably a little too much detail work, but it certainly looked good.
Last edited by mayfield; 09-07-2008 at 08:18 AM.
Reason: Updated price w/shipping
I also installed the Alpine SPS-600 speakers ($64 w/shipping on eBay). I cut the insulation foam in a X pattern (rather than a cross "+") so the ends of the cuts were right over the mounting screws. To make sure the duct tape went on nice and flat, I first used some brush-on Krazy Glue to seal the cut. I started by pinching together two of the adjacent corners at the center of the cut after dabbing a little Krazy Glue on the edges and then over the top of the seam for about 1/2". It joins quickly and I was careful not to glue it to the back of the speaker magnet. I did the same thing on the other two pieces and then joined the two halves at the middle, lining up the cuts. Once the center was held together, I continued pinching and gluing down each seam to the end of the cuts. Altogether, it took maybe 4 minutes. I considered leaving it at that, but decided to secure it with the duct tape. With everything perfectly flat, the duct tape went on nicely. I cut round ends on the duct tape so there were no ragged edges or corners. Probably a little too much detail work, but it certainly looked good.
Good idea.
On my other car I was doing sound deadening and after everything was done I replaced insulation with Heavy Duty Trash Bag and taped it with duct tape all the way around. That was 10 years ago. At the present time my parents using that Mazda as an errand car. Still running fine. Couple of weeks ago my Mom complained that one of the speakers stop working, so I removed the panels and to my surprise all my trash bags and duct tape was perfectly fine. Go figure. By the way problem was with one of the connectors on the speaker and it was fixed quickly.
My Hertz speakers are driven by the Kenwood DNX7120 NAV control unit. Sound is great! Just door speakers, no additional rear speakers were installed. It all depends on what you can hear and how deep your pockets are.
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