Does anyone feel like I do that in some cases bi-wiring actually is a step backwrds in sound quality, rather than using a single large cable with good connects? I have tried it and the sound became diffuse, the timing or meter was off, not coherent and the bass impact suffered greatly.

I would be interested in you favorite speaker cable for single or bi-wiring if you had good results. At the moment I have original Monster that has about 30 years on it in parallel with some new 12 ga. in wall wiring from the same company.. I have ordered some new Monster XPHP to try. I try to keep cable lenghts to under 17 feet, so they do have some effect but not like 25 feet or more.