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- 2019 Challenger Hellcat Redeye Wide Body
I thought I'd posted a complaint/inquiry about hearing a slight delay from the dual subs in this forum, but can't find it if I did. I did post it in the Challengertalk.com forum. I found it and posted the below update/resurrection of my original post there (make a couple of changes - this version is better). But the regulars in this forum have offered some really strong advice over the past five years on several topics. I'm interested if anyone here has experience with vibration damping their trunk sub-woofers. So here goes...
Update - "I didn't do anything about my perception of hearing a slight delay from the trunk subwoofers since posting this right after I bought the car. I've only driven my car 8,000 miles since new, and its up for winter five months every year. As I said, I always wondered if I was hearing something that wasn't "there". Never got around to bringing it to the dealership - too late now.
Got the car out of storage this month and yesterday a friend came over to see if he also could hear the slight delay - the poor quality of these expensive subs - I've always thought I'd heard. Holy Moly (or words to the effect)! What was causing the horrible racket that my wife, upon entering my detached garage while my friend and I were still inside the car with windows closed confirming there was indeed a weird bass delay effect, described as sounding like there was a person in the trunk trying to bang there way out? Inside the car we couldn't hear what she was hearing. The Challenger wasn't running, the stereo was playing a Led Zeppelin song from an iPhone with good bass, the EQ was near flat on the UConnect, the volume was at 31 (loud - louder than I listen when driving - but not maxed out) - and the components under the trunk mat were jumping up and down in time to the bass beat! The flat-fixer in its spot, the entire tray containing the subs, the subs themselves - all vibrating up and down badly. Only the battery seemed visibly anchored, but touching it I could feel plenty of vibration. Folks, you had to be there to appreciate how wrong this was!
We got out and opened the trunk and saw all the above. But what was the banging noise my wife had reported and we could now hear as loud as the music? When I looked under the car I saw the entire fuel tank visibly vibrating. It was where most of the awful noise was coming from. Really shaking, as in my first thought was the bolts/retaining apparatus holding the fuel tank in place wouldn't last long due to metal fatigue if I kept subjecting it to this kind of vibration. And the delay effect? It seemed to be from all the stuff slapping around, probably mostly from the fuel tank itself bouncing forward a bass-like sound and sending that sound to the front seats just behind the music beat.
Unbelievable, was my first acid thought. How could Dodge sell an upgraded audio system for $2,000 in a $90,000 car with dual sub-woofer vibration characteristics like this? Then again, maybe I just got a car without something in the trunk that would dampen out the sub's vibrations? My friend, who has installed sound damping products in a few cars pointed out there was the thinnest of damping products installed under the subs - we could see the edge without removing the sub woofer tray. He said he can remedy the vibration problem if we install Kilmat, which is a brand product (there are similar ones - Dynamat, for one) that is intended to dampen unwanted vibrations under the subs - so I ordered some Kilmat yesterday. He says this stuff "won't come up" so you have to put it down right the first time. He said, "You have an investment in this car. Do you want to change it from stock?" Well, not a big concern if it resolves the noise like I've kidnapped somebody, the bothersome delay, and potentially the fuel tank dropping off. Anyone interested in buying my car some day should appreciate/overlook my few reversible upgrades, like the catch can and the AAD suspension arms front and back. And, whatever I do to make the Harmon Kardon audio sound right could, with effort and a gallon of Goo Be Gone, be reversed.
Anyone else observed this crazy vibration? Any advice about trying Kilmat inside the car trunk where it will hardly be visible under the subs? My friend said also sticking some under the fuel tank would work, but I'm reluctant to try that. I'd rather work inside the car.
Thanks in advance!
Update - "I didn't do anything about my perception of hearing a slight delay from the trunk subwoofers since posting this right after I bought the car. I've only driven my car 8,000 miles since new, and its up for winter five months every year. As I said, I always wondered if I was hearing something that wasn't "there". Never got around to bringing it to the dealership - too late now.
Got the car out of storage this month and yesterday a friend came over to see if he also could hear the slight delay - the poor quality of these expensive subs - I've always thought I'd heard. Holy Moly (or words to the effect)! What was causing the horrible racket that my wife, upon entering my detached garage while my friend and I were still inside the car with windows closed confirming there was indeed a weird bass delay effect, described as sounding like there was a person in the trunk trying to bang there way out? Inside the car we couldn't hear what she was hearing. The Challenger wasn't running, the stereo was playing a Led Zeppelin song from an iPhone with good bass, the EQ was near flat on the UConnect, the volume was at 31 (loud - louder than I listen when driving - but not maxed out) - and the components under the trunk mat were jumping up and down in time to the bass beat! The flat-fixer in its spot, the entire tray containing the subs, the subs themselves - all vibrating up and down badly. Only the battery seemed visibly anchored, but touching it I could feel plenty of vibration. Folks, you had to be there to appreciate how wrong this was!
We got out and opened the trunk and saw all the above. But what was the banging noise my wife had reported and we could now hear as loud as the music? When I looked under the car I saw the entire fuel tank visibly vibrating. It was where most of the awful noise was coming from. Really shaking, as in my first thought was the bolts/retaining apparatus holding the fuel tank in place wouldn't last long due to metal fatigue if I kept subjecting it to this kind of vibration. And the delay effect? It seemed to be from all the stuff slapping around, probably mostly from the fuel tank itself bouncing forward a bass-like sound and sending that sound to the front seats just behind the music beat.
Unbelievable, was my first acid thought. How could Dodge sell an upgraded audio system for $2,000 in a $90,000 car with dual sub-woofer vibration characteristics like this? Then again, maybe I just got a car without something in the trunk that would dampen out the sub's vibrations? My friend, who has installed sound damping products in a few cars pointed out there was the thinnest of damping products installed under the subs - we could see the edge without removing the sub woofer tray. He said he can remedy the vibration problem if we install Kilmat, which is a brand product (there are similar ones - Dynamat, for one) that is intended to dampen unwanted vibrations under the subs - so I ordered some Kilmat yesterday. He says this stuff "won't come up" so you have to put it down right the first time. He said, "You have an investment in this car. Do you want to change it from stock?" Well, not a big concern if it resolves the noise like I've kidnapped somebody, the bothersome delay, and potentially the fuel tank dropping off. Anyone interested in buying my car some day should appreciate/overlook my few reversible upgrades, like the catch can and the AAD suspension arms front and back. And, whatever I do to make the Harmon Kardon audio sound right could, with effort and a gallon of Goo Be Gone, be reversed.
Anyone else observed this crazy vibration? Any advice about trying Kilmat inside the car trunk where it will hardly be visible under the subs? My friend said also sticking some under the fuel tank would work, but I'm reluctant to try that. I'd rather work inside the car.
Thanks in advance!
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