That may be possible but I think if you add any more depth than the speaker more mods are probably required. I'd say even a quarter inch and the pannel would be smashing my rubber surrounds in if the grills were not protecting them. If he wants to heavily mod the doors I'm sure he could get just about anything in there. Not sure the speakers being used but I feel the way I did is decent and I'm using ~$300 speakers. But I agree there are probably adapters or mounting rings that people use. The way I have it the speakers are just flat with the door as opposed to the stock speakers being angled into the door pannel. Can't comment on the difference between the two because I never heard the stock speakers. But the components I have now scream
