There was such a significant change, even my wife noticed.
Did she come running from the kitchen? If not, it doesn't count!
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Just kiddin' What you did is not an end all argument for bi-amping. If I read your post corectly, you are using one and the same amp and just using more outs on a single speaker? That's not it. The difference you heard is not useful for the pro-bi-amp argument.
@RP1, I really think you got a good advice. Also, I believe you were also using one amp for your bi-amping, so I'll say +1 for running them straight with one set of cables.
400 is not what they NEED, it's what they can put up with for a rather short period. Recommended is 75Wpch into 8ohms and what they need to seriously threaten your good hearing is 16Watts. Meaning even if you're running them very loud they still have enough headroom to handle difficult and demanding parts.