Yeah- it's a high impedance mic and when the cable is extended, the response of the mic goes out the window.

Your ears are the final judge but Audyssey analyses data that people can't, unless they can discern multiple reflections, phase cancellations and frequency anomalies. Yeah, I know "the human brain is the most complex computer known to man" and all that. The problem is that unless the user knows exactly what to compensate, how much and in which direction, it's not going to work well.

If you have a way to see what changes are being made, go nuts. If not, it will be a long, slow process of trial and error.