rocket 88

thankyou for all your input.

I change one thing a time over a few days so I digest and see if I can hear a difference. There's no doubt, not placebo, that cables do matter! Power matters 

also.

I once used some speakers, one a couple feet from the amp and the other was 8 feet away.  From bulk cable, I cut a 5 foot length to wire the closest one, and a longer one for the other [to keep excess wire from the floor].  Didn't seem to bother the sound to me, but when my pal [who thinks a lot] said it would bother him to have things set up that way, it started in on my head, too. A few days later, I changed out the shorter one for an equal length one.  Didn't seem to make a difference, but mentally I felt much better. 

Most (if not all) professional audiophile equipment reviewers do not believe bi-wiring amounts to anything.  If you hunt around the web, you'll find a few fair & objective A/B shoot-outs or comparisons out there where some folks have tested single vs. bi-wire to evaluate the difference(s).  The results are largely inconclusive and, essentially, in the ears of the beholders.  It's like the age-old debates of whether $5,000 speaker cables are better than $500 cables; super expensive connecters are better than less expensive ones; digital sound is better than vinyl; etc., etc. etc.  The standing joke is that "bi-wiring" is just another ploy for "buy wiring".

I had a pair of Paradigm Monitor 9 (original versions) single-wired with 14-gauge Monster speaker cable and then bi-wired them with some 12-gauge AudioQuest Type 4, similar in construction to Rocket 88.  Sound was noticeably improved with the AudioQuest.  However, I believe this was a function of thicker gauge wire; not bi-wiring.

If I were you, I'd hunt around for a shop that would loan me a pair of 12' Rocket 88 with the dbs (or some other suitable length) and try bi-wiring for yourself before spending that kind of cash.  Personally, I'm inclined to agree with those who believe this dbs thing is a marketing ploy.  All of the reading and research I've done on this from impartial sources points in that direction.

With respect to the lengths of wire involved, I would keep the lengths identical.  I'm not sure you'd hear a dramatic difference, comparatively speaking, in phase response by using different lengths.  However, this is a theoretical possibility.  Try it.  See/hear what you think.

@guitarlenn55

I’ve bi-wired with Audioquest in a number of ways. Of course, they will tell you to bi--wire as symmetrically as possible. However, I’ve had good success with breaking the rules, somewhat. I use a combination of 6ft Mont Blanc (12 AWG, PSC+ copper, counter-spiral geometry) for LF and 7.5 ft KE-4 (15 AWG, PSS silver, star-quad geometry) for HF. Close to 2ft difference, different metals, different geometries. I like this combination a lot. I’ve compared it directly to 8ft Redwood single-biwire ($8500 MSRP) and it was a wash, with some points going to the Redwood and some to my weird biwire.

I ended up preferring full double biwires of Kilimanjaro (PSS silver version of Mont Blanc) or Wildwood (Redwood with more PSS silver), at much greater expense, but the quirky mismatched biwire is still one of my favorite speakers cables, and I still use it in a smaller office system. The combination of PSC+ copper and PSS silver yields a really natural timbre. I didn’t like the Thunderbird Zero (alone, no biwire) at all, so I’d say it’s better than that.

As far as coherence, I’m a guy who dislikes the Tannoy supertweeters because it messes with coherence, but I don’t have any problem with this mis-matched biwire. You’ll be fine!

I also have a single-biwire Rocket 88 in my gear collection, and it’s a really nice cable for the money. Good for helping to smooth out a solid state amp!

Audio Advisors will build you what ever you want, but without the 72 volt battery pack.