Nowadays modern 6 X 9 tweeters and midranges protrude upwards quite a bit. I made 3/4 inch spacers in MDF as I'm told it's less hack than plywood or 2 X 6s and is supposed to conduct sound better, The studs allow quick changes each time you, or the cold, blow them up.

Owner caption January 2014 · Photo 35 of 75