seeking help from the audio gods on this forum on what tower speaker upgrade i should do.

i have a little money to burn & i want to here music while wakeboarding. i've had my eyes on the KM6500.2 HLCD set up, but they are expensive; plus i have four speaker cans to fill which is double the cost. i personally don't see the need for more than two HLCD's.

i'm hoping to keep this upgrade around $500.00 (speakers only & no new cans).

are there any 6 1/2" speakers i can buy that i would be able to hear 60-75ft behind the boat other than HLCD's?


here is my current set up:
head unit KMR-44U
remote KCA-RC107MR
amp #1 ZXM700.5
sub KM10 (powered by amp #1, ported box)
twr speakers 4-db651 6 1/2" (powered by amp #1)
twr cans 2-Aerial Twin Bullets (four cans)
amp #2 ZX200.4
cabin speakers 6-KM613 (powered by amp#2) came stock with boat