I had similar results to your comparrison early on, but once the 60.5's had about 300 hours on them, they really came to life... much smoother in the mids and highs. Hope this helps.I had my XA-60.5 for nearly two years, and I ran them seven days a week, sometimes 10 hours a day. The XA-30.5 still sounded better in some respects in my system.
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Nevertheless, it's good to know you have arrived at something that satisfies you.

