After installing a amp and speakers in a 2012 Accord I had the issue of the speakers going crazy when the engine speed was between 1100 & 1400 rpm. I disconnected the ANC and the speakers are good but now I have the exhaust resonance issue at those engine speeds. Has anyone found a way to dampen this resonance?

 

increase transmission loss of the floor to lower road noise - is one option.

 

i explain deadening and MLV installation (on a budget) in this thread
https://www.hondaaccordforum.com/for...e8/#post339695

 

For the rear mic all you need to do is remove the dome light & on the drivers side you should feel a wire under the roof liner. Pull that wire and see if the rear mic moves, it should, than snip it and put everything back together.