Blown Atrium 65sdi

dhhahh

I just got my Atrium 65SDI's repaired, they said crossover, drivers and tweeters were shot and I only used the speakers for a week. I use a Denon 5803 with the multiroom feature. My speaker runs are long with runs of 60 and 75 feet of Monster xp. I supply the amp with an Ipod for outdoor pool music. I have had a pair of niles 10's hooked up for two weeks now and they don't seem to be damaged. Any advice what fried my speakers?