Brad Way wrote:
1) The traditional musicman setup was one single pickup kind of between the location of the typical neck and bridge pickup? Why have some musicman's gone to 2 pickups? Is this just marketing or does a second pickup add something extra that is needed?
A second pickup gives you more tone options. Good if you like to explore tones. You see a lot more single pickup Stingrays than doubles.
Brad Way wrote:
2) Bartolini sells a dual coal and quad coil designs with this pickup? As a player what will are the advantages to the quad coil?!
Dual coils are simpler to wire. Quads give you more wiring options which require more switches and head scratching trying to figure out how to wire, then more head scratching trying to figure out which switches to use for which tone.
Brad Way wrote:
3) The pickup is also sold in a bright, deep, and classic version? What should I expect from each?
I can't answer this with any first hand A/B/C experience, but you state you like a warm big sound. This eliminates the bright. The deep version will have slightly rolled off trebles, strong lows and low-mids. I'm not sure about the Classic, but it's likely more of an open balanced tone which might be advantageous for the B-string.
This would be a good question to post on
http://www.talkbass.com