I have tried them both ways and there is a noticeable though not enormous improvement. I used nordost spm - two shotgun runs. I also tried them with this 'mystery' kimber - black and brown interwoven cable.
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2. Nordost Blue Heaven, Coincident CST-1, Kimber 8tc on the bass and 4tc on the treble and Sakura OTA.
3. Increased transparency and dynamics: cleaner tighter and faster bass, more extension on the top and cleaner midrange.
4. I tried a single run once when I was swapping cables between systems, but I thought the sound was murky, muted and veiled. Not surprising when you look at what is being used as a jumper.
I suscribe to the theory that a better single wire just may outperform a lesser quality bi-wire. I had AP Oval 12 bi-wires on my 1.5's and upgraded to single HT Pro 9+ plus HT jumpers and there was an upswing in detail after the change. I believe that certain speakers can really benefit from bi-wiring but in doing so one has to audition a pair against a "better" single cable. And like Fineberg above sometimes we can make things even better by using different wires in a bi-wire pair. As always, try before you buy if you can, if not buy used. Do a search at AA's planar asylum on bi-wiring to see other Maggie owner's choices.