She's right. I know 2 audiophiles that lost their lives with those damn XA60.5's. One minute its just sitting there floating calmly between your speakers, and without realizing it, the amp slips out of balance and starts spinning. It rips the speaker cables out of the binding posts and takes your head off just like a big weed whacker. I've seen pics of incidents involving double bi wiring and the images are horrific. Stay away from those amps. Its not worth the risk.