Bi-wiring with different cables for HF and LF?

I think you are asking too much of your cables. Even though cables can sound different from each other, you have to remember they're still passive components and can only do so much. A well designed cable should give you excellent sound in all areas. If you're not happy with your bass, a much better solution would be to focus on your active components. Upgrading your source, preamp or amp is more likely to fix your problem.

"Richard Vandersteen also says its a bad idea."

He's right. I was using Vandersteen speakers when I experimented with using different cables on the top and bottom. Its kind of hard to explain, but the system just sounded wrong. You really have to hear it for yourself.

Agree that it’s a bad idea. In another thread on this forum, a well respected amplifier designer commented that NOT using identical cable and length would create problems with coherence. Sounds to me like using different cables is just working against what you are trying to achieve.

Well, I was thinking my amp was pretty decent, just wanted to get some ideas for the LF run. The amp is a McCormack DNA1 Deluxe Rev.A, which is rated at 150 wpc and is supposed to be good down to 2 ohms.

I'm thinking the DNA1 is a very good amp, and should give you what you're looking for. What is the rest of your system, source, preamp, interconnects? Also, position of speaker in room, distance from back wall and side wall?

Thanks Tls49!

Honestly, I just want to compare some speaker cables on the LF run. I'm not really interested in changing up my components. And I've already experimented a lot with speaker location. Maybe I'll call the cable company and get their thoughts and try out some cables.