sound deadening review and stickied?

Pintsize725

Gtmat Quadro!

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Tracie

YzGyz

changed my mind and will go with GT Onyx. I'm going to support those that support our community.

Pintsize725

If you sent us a PM, sorry for the delay in responding. I've been out of the office.

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Tracie

YzGyz

NP, I just sent msg to GTmat on how to buy. My speaker/woofer just came so I'm getting ready to do everything at once. I even DL a simple DB meter for my phone to record before and after.

markesc

How much do I need just for the two doors? any forum member discount?

This stuff sounds lightyears ahead of everything else being multi layered with different layer types unlike everything else out there!

Pintsize725

Hey Markesc,
I no longer work for the company. If you give them a call and offer to purchase over the phone, they used to give 15% off but I'm not sure if that's the case anymore. Less would be more so I'd say maybe 2 squares for each door, cut and strategically placed.

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Tracie

markesc

Just ordered some, they're doing 15% off right now. Got 15 sq feet, so should be able to do the doors and rear hatch/trunk area with some spares for future use.

I think this plus those lanzars and callin it a day. Would love to upgrade the tweeters but I'm lost on what will/won't fit/and is not harsh sounding but will work with the low powered stock deck.

DrNumbers

For future reference, Noico is relatively cheap and works well. No smell at all. Definitely beats paying for overpriced deadener like Dynamat.

markesc

I've tried second skin in the past, which did well, but layering the luxury liner pro ontop of it just didn't make much of a difference to warrant the additional weight penalty in an 07 wrx.

My hope this time is that the multi layered gt mat stuff will do a little better, but I'm going for a single layer and calling it a day because of the weight penalty which I plan to offset by removing the spare? I had a lexus sc300 and when I removed the spare on that one, it created more noise, so it stayed.

Jayhovah

Anyone looking for info on this a great resource is https://www.sounddeadenershowdown.com/

He sells his own products too... but the information, guides, etc on there are beyond useful. There is more to these upgrades than just loading a ton of mass to the body... reading up will help you decide between products which, on the surface, all appear to be pretty much the same thing.

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OldGrayDog

Agree 100% I did doors with Dynamat extreme, then tried Noico for the hatch area. Noico cost was so much more reasonable, and quality was at least as good.

DrNumbers

While this website was an interesting read, I feel like it's a bit misleading at times and ends up being misinterpreted. This guy says that 25% is the optimal coverage for CLD tiles, but I think many people end up covering 25% with other types of products (i.e. dynamat, noico, gtmat) which are more akin to the CLD sheets that he sells. In fact, he notes that more CLD sheet is needed to match the performance of CLD tiles. How much coverage though is not stated, as his CLD sheets are meant for 100% coverage to protect from corrosion.

He doesn't show any test to say that 25% coverage is optimal. I watched the video on youtube, and pinging a steel sheet with and without CLD tile is not a real test. All he showed is that 25% coverage does something. I will say that the difference was impressive, but still nothing to back up the claim of 25% coverage being optimal.

I think the other thing is that his website is really focused on blocking sound as opposed to vibration/rattles. In that regard, I agree that layering sound deadener to reduce sound is not effective. I'm curious as to how well 25% coverage would reduce door/hatch rattles in the 370z resulting from mid-bass or subs hitting. I'm not convinced that using high coverage of dynamat/noico/gtmat is useless for mitigating rattles. There are certainly diminishing returns though.

This begs the question - Optimal for what? Is cost effectiveness part of that equation? If we don't care about cost, and our goal is for example, elimination of sub rattles, I think that optimal point changes. Maybe we don't need 100% coverage or double layering, but I think there's a reason most SQ/SPL competitors go heavy on the coverage besides being misinformed. Ultimately, I think going 25% coverage with most sound deadeners is not going to be very effective in reducing rattles. There was a clear difference in tapping on my doors with low coverage and high coverage.

All in all, still some good info in there, but I've seen a lot of people (on audio forums) misinterpret what is actually being said.

markesc

Agreed.

I'm going to just take the experimental approach, not like one cannot remove the door panels again and try something different/add later.

Just saw on this channel: https://www.youtube.com/user/CarAudioFabrication/videos

this video: https://www.youtube.com/watch?v=h3EXuHlBy4M

Looks like he uses different layers of different types, and custom plastic panels to cover the window service area opening, while still allowing them to be unscrewed/removed if the window ever needs replaced. Top notch work! (great excuse to buy all kinds of tools).

Off topic, but I read somewhere people complaining about the bose system, here is an Audio Control amp that is in my opinion future proof for any vehicle moving forward if you want to keep the stock deck. NO remote turn on wire needed and you get an extra set of line outs for future sub amp add ons: https://www.youtube.com/watch?v=flz6sq1dCuk&t=4s They also have a dsp that's just sweet!

The idea is it eliminates the need for a line/level converter, as everything is built into the amp. An INSANE amount of flexibility. Probably going to be the way everyone will have to go in the future with this hobby as oems come up with new ways to over complicate things and give us bs we don't need/want.

I found this helpful as well: https://www.youtube.com/watch?v=308ueFVOylU

markesc

wow 15 sq feet GTMAT Quadro Pro didn't go very far!!!

Upon advice from others, decided to tackle the rear trunk area first.

Before:



After:



Did whole sheets around the shock towers in hopes that it will reduce some of the freakin tire noise! Also did the back section not seen in the photos, but I'm positive that's where a lot of the exhaust noise comes from. Instead of doing the blanket cosmetic approach, I tried this time by focusing on areas that actually needed it as it's not a Ferrari/Bugatti/etc.

What shocked me most was just banging around and realizing that there are so many areas where it's simply tinny metal!!!!

So far I can tell an immediate difference just re-parking the car back into the garage!

Question:

I noticed there's a gap in the fender area that you can fit your hand in quite a ways on the drivers side, and not so much on the passenger side. Has anyone tried any sort of expanding foam sound deadener in these two particular places?

Will order some more and not sure if I should do that small area where people put their aftermarket amps, or if the doors would should take priority?

Appreciate everyone advice on this! I'm late to the party however, 3.5 years of ownership and just now doing this...

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