I've owned my 2008 Accord for almost a year now.

On highways, depending on the smoothness of the road, the cabin noise can become extremely loud.

Last month I bought some Dynamat Extreme and covered the inside door panels for all 4 doors and the trunk area.

The change in cabin noise was minimal.

I pulled up the back seat and peeled back the carpet and noticed that there was a thick layer of foam under the carpet so I gathered that there is plenty of insulation on the floor area.

I remembered having the door panel off and noticing there was not much metal on the inner skin of the door. Basically the hole was very large, like the picture below.



I'm wondering if the road noise is coming through this rather large hole?

 

The more I think about it the more I'm betting it is the tire. On smooth roads the cabin noise is tolerable. On rough roads it's annoying.

I bought Kuhmo Escta Platinum tires about 10,000 miles ago. The UTQG rating is 600AA

I'm thinking about changing out to General Altimax HP directional tire with a UTQG rating of 440 AA.

Basically the higher the UTQG the longer the tread life and subsequently the harder the tire.

 

wow. over 200 views and no responses.

 

Your 200 views probably comes from people who click on the New Posts at the top, rather than people who know or are interested in the Accord. They just want to see "what's new."

Making the Accord quiet is a lost cause from what I have read. If we compare the TL and the Accord V6 EX-L as the same car, and 300lbs+ difference. That difference is the sound detening and insolation. TL owners don't really complaint about noise, Accord owners do.

300lbs is a lot of dynamat.

Sorry, no help.

 

I had my wife go to Discount Tire the other day because I got the call the General Altimax HP tires I ordered arrived.

When I got home from work I noticed that Discount Tire installed Yokahamas instead.

It is a little softer tire and I could tell a slight decrease in the road noise on the highway.

Once I get the General Altimax HP tires I will see if the road noise decreases any more.

 

I finally got the General Altimax HP tires on my Accord.

It certainly feels like a softer ride and appears to be about 10% quieter in the cabin on the highway.

Time will tell.