Gee I never said FOAM , I said Rubber as in Butyl . Read O.P. Foam on
interior house speaker is crap, UV in a house will trash them in 7 yrs,
in a car even less, on a boat I wouldnt think of foam. Ive paid to much
over the years only replacing Foam surrounds. Your high quality car
speakers are Not foam surrounds. Foam is not UV and heat stable, and is
fragile.