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C7 coupe sound deadening

 
Old 02-11-2019, 04:45 PM
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Dave Kitch
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Default C7 coupe sound deadening

I am planning to add a sound deadening kit to my 2015 C7 base coupe interior and would like to measure and record the sound amplitude versus frequency before/after. Can anyone recommend a low end priced sound meter to do this measurement?

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Dave K.
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Old 02-11-2019, 05:00 PM
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Avanti
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I'd suggest you save your resources; instead, do a search here. Lots of posts, some with the data you wish. All the best.
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Old 02-11-2019, 06:02 PM
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JMII
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iPad plus Studio Six Digital "Audio Tools" software ($20). Add a Dayton Audio iMM-6 calibrated microphone ($16) if you really want accurate results. This is a decent budget system... well provided you already have an iPad. The microphone isn't great for SPL measurements, it claims to handle up to 127 dB but I've overloaded it using the stock C7 audio system. However for testing sound deading materials with the windows up it will be fine. Running an average FFT plot should give good comparison data as long as microphone placement is solid and consistent.
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Old 02-12-2019, 08:48 AM
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Dave Kitch
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JMII,

Thanks for the post. Will investigate your recommends.

Dave K.
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Old 02-12-2019, 02:03 PM
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When I was researching knocking down the noise level in my car, I used the iPhone app Decibel X Pro... Likely does not give exact sound levels, but was useful in determining the relative differences before and after.
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Old 02-12-2019, 02:05 PM
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RMS73
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i used the dB meter app for my iphone for the before and after comparison of the installation of Crazy Cowboy's kit.
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Old 02-12-2019, 02:22 PM
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wlittle49
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I used my ears and after spending $450 on the extreme kit and installing it I can tell no difference at all. Don't care what the instruments may say. Many others swear by the sound deadening kits and cite amazing levels of noise reduction.
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Old 02-12-2019, 04:36 PM
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Invest in a louder muffler..
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Old 02-12-2019, 11:00 PM
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Originally Posted by wlittle49 View Post
I used my ears and after spending $450 on the extreme kit and installing it I can tell no difference at all. Don't care what the instruments may say. Many others swear by the sound deadening kits and cite amazing levels of noise reduction.
Same here, I really found no noticeable difference after the install. It was a lot of hard work for little or no result.
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Old 02-13-2019, 07:42 AM
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I didn't use a kit, but bought a Fatmat sound deadening material roll from Amazon some four years ago, I applied it to the area behind the seats and the cargo area, including the wheel wells. It added less than 20 pounds, and significantly reduced noise levels. Initially I thought it was too much, as it quieted down the exhaust substantially, but I've gotten used to it. About $60.
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Old 02-14-2019, 05:02 AM
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Road Noise reduction and DB readings

2018 Z06 M7 2LZ
For me the road noise was unbearable. I could not listen to the radio, difficult listening to the passenger.....etc.

I used a DB App for my android phone to take noise level readings. All readings taken with cell phone at ear level.
All readings were taken on same stretch of road, same speed, same gear. These numbers are for reference. Actual DB reading from a certified DB meter would most likely be different.
The important thing here is the DB reduction.
3 sets of readings
-Stock
-With Insulation with Run Flats
-With insulation and Continental Extreme Contact Non-run flats

I installed the exotic vette extreme kit along with additional sound deadening material where ever there was room for additional material. Here I used .080" thick Kilmat from Amazon. For the top layer sound insulation, there was plenty of additional material in the Extreme kit to fill as many additional spots as possible. I took my time, 15 hrs total.
....................Avg*.........Min.... ....Max
Stock.............78............72...... ....85
W/Insulation...74............68..........8 2
W/ins + NRF....72...........67..........80
* the avg number is the average during the time of the test run, not the avg of the min and max.

I am extremely satisfied with my results. I can comfortably listen to the radio and have normal conversations with passenger.
I would do it again.
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Old 02-14-2019, 12:50 PM
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10dB is perceived as being twice as loud (2x). So the 5dB difference measured above is actually a pretty good improvement (1x).

For reference - https://www.noisehelp.com/decibel-scale.html

Every car I've added sound deading to resulted in an improvement. Just keep in mind a lot of road noise comes thru the windows so don't expect miracles.

Last edited by JMII; 02-14-2019 at 12:50 PM.
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Old 02-14-2019, 07:53 PM
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Did that on my 15 base coupe. It took a couple of days. I went from the front floorboard to the back. Tried to fill up everything. I used a couple of different phone apps and both showed about a 5db drop. It noticeably took the 'edge' off the road noise on most roads. Part of the road to the house is chip seal. It did nothing for that. That is still terrible. Can't even hear the wife talk, so it's not necessarily a bad thing.
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Old 02-15-2019, 09:06 PM
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Reply to Stephen 1254 regarding FatMat:
Can you tell us more about how you installed it? I assume you installed only in the interior and put it under the existing mat in the flat area, but what did you do over the wheel wells? Did you cover the kit material with anything to match the existing material? What color did you purchase? I think it is sold in black or shiny metallic. Thanks.

Last edited by AZ_3LT; 02-15-2019 at 09:12 PM.
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Old 02-15-2019, 09:24 PM
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TXSteveF
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I installed the double extreme kit and noticed an improvement. The wife and I drive a grooved concrete toll road at 75/85 mph regularly and really noticed an improvement on it. Also the stereo sounds much better especially after I covered the sub box. I for one thought it was a great improvement but no itís not near the sound level comfort of my King Ranch or my wifeís Lexus. Itís a plastic sports car with wide a$$ ZP tires so noise is part of it. To each his own, it didnít cost much, I did it myself and took my time and I think it was worth the effort but obviously opinions do vary.

And one last thing, I also noticed that it did tone down the exhaust. I was surprised by that and have also gotten use to it.

Last edited by TXSteveF; 02-15-2019 at 09:28 PM.
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Old 02-16-2019, 06:19 AM
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What a face palm that this is a concern at all. Hey GM, get your **** together.
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