Snell Type D Hook Up

Hi, looking for advice again. I have a pair of Snell Type D that have turned into the bane of my life. I took them into get repaired, tweeters we,re not working, only the bass drivers were. I,m using jumpers. The repairman said nothing wrong, I was not tightening the post enough. he threw a cheap pair of wire on the posts and the speaker played perfectly. I am using speltz anti cable which somehow I think is the problem but I have no good idea why. Any thoughts or suggestions?

Odyssey Candela Preamp
Odyssey Stratos Amp
Demon CDP
GMA Europa monitors
REL Strata III sub woofer

Thanks much, Dave