have any of you that have put speakers in the bags use sound deadening material such as dynomat or equivalent also when you did your install? Is there any pros/cons in using it?

 

Tons of guys use it. It does work.

Adds some warmth to the sound and adds some temperature moderation under the hood.

 

A few years ago in here it was suggested in here to use polyfil batting so I did. I cut it to shape and wire tied it to the back side of the speaker frame. Worked like a charm. I've never used dynomat which may work even better.

 

My bags are fully done with the Herculiner truck bed lining. The stuff u use with the paint brush. I then lined the whole bag with noico sound deadener as well.