First, let me say that I don't really trust my own judgement until I've owned something for 2 months. I'm only about 2 weeks into owning a pair of RS6's. I bought a new pair off audiogon dirt cheap.
However, as usual, I have lots of opinions
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I had the A6's and the RS6's hooked up side by side for awhile, so I definately have a feel for how they compare. The spendor's are more detailed and have amazing mid-range. The mid-range on the spendor's is shockingly life-like. Acoustic guitar is delicious. The sound staging and the imaging when I play something delicate like Joshua Radin is jaw dropping with the spendors. That's where the spendors shine.
Switching quickly back and forth between the spendors and the RS6's there is an obvious loss in the "you are there" factor. The RS6's are amazingly good for the money, and the "you are there" factor is still pretty good, but it's the strong suit of the spendors.
However, there is significantly more bass with the RS6's. The RS6's sound terrific with contemporary pop/rock music. For instance, Josh Kelley sounds fabulous with the RS6's. They provide a very entertaining sound and I really like them. The bass is strong and palpable, but unlike the B&W CM7's I used to own, strong bass does not impact the detail and clairity of the higher frequencies. Also, with my NAD equipment they are not at all fatigueing to listen to at length. Contrary to some opinions I do not find them bright in the least and there is zero sibilance so far with challenging high frequency playback. In my opinion, RS6's are competitive with the B&W CM7's at twice the price. Maybe a smidgen less detail, but they make up for that with a full bodied smooth delivery. They are truly a bargain. Especially for what I paid.
What it comes down to, I think, is that the spendors are an audiophile's speaker. If you listen to alot of acoustic music, classical, and jazz, and you have delicate refined electronics and want incredible levels of crisp detail then the spendors are a perfect fit.
In my system, with the NAD equipment, I believe the RS6's are a better fit. I reserve the right to change my mind in about 6 weeks and go off in some crazy new direction.