plenty for dash= 2-3 inches...the deal with dash is to chose a speaker with a low profile tweet so it doesnt hit the dash top grille.
door speKERS VERY TIGHT..2-2.5 nches(??) just chose around a 100 watt speaker here so the magnet wont be too big.....theres no hole for the speaker...worse design ive ever seen for speaker placement...
HTH



