The old Deafcon IV's weigh 66 pounds per pair. The new Deafcon IV Reference weigh 32 pounds per pair. The Deafcon's went on a serious diet in 2005 and sound 10 times better than the 2004 model. They moved from Kicker components and standard tweeters to pro audio grade Image Dynamics mid-bass and HLCD (horns).
I don't think you can go wrong with either NVS or the new Skylon Deafcon Reference series if you are aiming for incredible sound at 80 feet. Besides the SPL at 80 feet, other factors to consider:
1) rigidity of the wakeboard tower considering the total speaker system weight up there. I don't know the weight of a pair of NVS systems but the Skylon's are really light this year at 32 pounds.
2) style and fit and finish (very much an personal preference)
3) cone material for a marine application (depending on use, paper cones can be a problem - I couldn't use paper cones on my boat)
4) finish options (carbon fiber looks really cool to me - again personal preference)
5) I love LED down lights to add a reddish ambiance inside the boat (I know - it doesn't add to the sound)
6) Impedence. A system wired at 2 ohms (like the Deafcon) can make an amplifier put out twice the watts RMS if the amp can handle 2 ohms.
http://www.wakeside.com/page/W/PROD/skylon_wakeboard_tower_speakers/skylon_deafcon_iv_ac112g4 Mike
(Message edited by wakeside1 on February 27, 2005)
(Message edited by wakeside1 on February 27, 2005)