IMHO, it depends on how much you travel and carry. My 10 has speakers in the lids, as stated at speed you can't hear them as well as lowers, unless you're pushing a few watts, and if you have that much power, chances are you have an amp in the bags also. I have 3 amps in my fairing in order to free up bag space, but 4 6x9 speakers still use a little room. On my 16 and 17 I went with amp in the fairing and all speakers in the fairing and lowers. I can hear everything just fine and have all the space in my bags.