Well, as I've stated in numerous posts in numerous threads (such as this one) for about two years now, my original intention when purchasing my Spector ReBops (which eventually grew to include a DLX 4 EX Zebrawood & DLX 5 FM Flame Maple fretted and HG Thor-ed fretless) was a complete pickup and electronic swap. I was looking for something that I felt would suit the "Spector meets Jazz Bass" nature of the ReBop line, which I feel comes from both the bolt-on nature as well as the difference in woods that brought some of the attack and punch of a good J-bass while still holding onto the best of the classic "Spector Sound".
For a while I looked at Active EMGs such as the TW single/dual coil model as well as the 35/40J Jazz pup in their soapbar shell, but came to the conclusion that the Active EMG sound was part of the Neck-Through tone that I didn't want to move toward, along with the experience of owning for a short time a pre-DLX ReBop 4-string that had been ToneDumped with 35CSs and a BTS System that didn't do anything for me tonally.
After hearing a great deal about them I finally gave Carey Nordstrand a call, and he spent a solid 30 minutes on the phone discussing what I was ultimately looking in terms of the tone at the end, the basses and their properties, possible preamps that were on my list, etc... I couldn't have asked for more personalized helpfulness if I tried, and in subsequent phone conversations with him and Stew we came to the decision that Big Singles would be the best choice to accentuate the "Jazz Bass" aspects of the basses, my desire for solid midrange (both in general as well as the frequencies I believe helps a fretless "cut through" a mix best) and my general "Set It And Forget It (tm)" usage of onboard EQ which led me away from Big Splits or Dual Coils.
...and then 2 years passed.
Firstly it took a while to purchased the preamps I had chosen, Aguilar OBP-3SK/PPs (keep in mind that every purchased was x3 in number and cost, as I had decided to do them all at once simply for the sake of getting it done - call it the "Anal-Retentive Bassist" in me
). After those were in hand... it seemed that every time I was close to the cost of the pickups and installation, one of my "dream basses" would *POP* up on the used market for a killer deal. Although this added 12 to 18 months, I can't be all that picky as I can't imagine not having those the two basses, my Mike Lull Modern 4 & 5. If the pickup project was for my "SpectorJazzes", these gave me the pure "SuperJazz" tone that Lull, Sadowsky and others at that level are known for. Even recently this past Spring I discussed "The Project" with my Better Half and got the okay to finally "start to finish" it... and that weekend came upon one of my true "dream basses", one which I never thought I'd come across due to sheer scarcity and cost (a Taylor AB-2 ABG) that was at an amazing price due to the economy. I couldn't very well turn away from that, but made the deal with TBH that this was "THE" bass purchase for 2009. As so I resigned to having the "The Project" put away for another 6 to 12 months. But I recently managed to sell off some gear that I wasn't using, but moreso hadn't thought I'd be able to sell. And in a moment of clarity I realized that it had now made the purchase of the pickups and installation possible, as opposed to picking up an oh-so-cool Epiphone Special Run Thunderbird in Silverburst with Chrome Hardware and Pickup covers. 
So finally, after a few PMs traded back-and forth between myself and Anthony "Nino" Valenti regarding a few sets of custom underwound Big Singles that he had ordered with great success that gives the pickups a touch more aggressiveness and a bit less "thickness", one set that is actually in one of his "Main Players" and one last call to Nordstrand and a conversation with Mike at Nordstrand about the possibility and positives/negatives of having that done, I FINALLY placed the order for 1 set of Big Singles in EMG-35 shells and 2 sets in EMG-40 shells, all underwound 5% through Brian @ BestBassGear.com... yet another great guy who took a significant portion of his workday to blab about the whole rambling story above while letting me know exactly what measurements he and Nordstrand would need for proper string-spacing and fitting.
Hopefully in about 4-6 weeks, the usual wait for custom orders, I'll have the pickups in hand and ready to head out to the local tech for installation... although if there's a TB member in the Akron/Cleveland, OH area good with a soldering iron, Aguilar OBP-3 experience, and willing to help out a financially tight fellow member I'll certainly spring for the Pizza 'n Beer.
Regardless of how it goes down, I'll post updates in this thread as when I first announced "The Project" just about 2 years ago I got several posts and PMs from members very interested in the outcome of this fairly unconventional union of Spector, bolt-on neck joint, Aguilar OBP-3, and Nordstrand Big Singles - I've relatively sure that this is the first setup of these particular components and apart from the mad_hungarian's absolutely killer Euro-LX5/Aguilar OBP-3/Bassline Passive Phase II NYC Soapbar ToneDumped setup I'm fairly certainly that EMGs are the vast majority of upgrades to Spectors in both pickups as well as preamps, and that no one's put Big Singles into a Spector before... but after 2 years of conversations with Carey, Stew and Mike from Nordstrand as well as discussing it with pros like Nino, I'm pretty d*mn sure this is the tone I've been hearing in my head for a long time.
Updates as they come...
For a while I looked at Active EMGs such as the TW single/dual coil model as well as the 35/40J Jazz pup in their soapbar shell, but came to the conclusion that the Active EMG sound was part of the Neck-Through tone that I didn't want to move toward, along with the experience of owning for a short time a pre-DLX ReBop 4-string that had been ToneDumped with 35CSs and a BTS System that didn't do anything for me tonally.
After hearing a great deal about them I finally gave Carey Nordstrand a call, and he spent a solid 30 minutes on the phone discussing what I was ultimately looking in terms of the tone at the end, the basses and their properties, possible preamps that were on my list, etc... I couldn't have asked for more personalized helpfulness if I tried, and in subsequent phone conversations with him and Stew we came to the decision that Big Singles would be the best choice to accentuate the "Jazz Bass" aspects of the basses, my desire for solid midrange (both in general as well as the frequencies I believe helps a fretless "cut through" a mix best) and my general "Set It And Forget It (tm)" usage of onboard EQ which led me away from Big Splits or Dual Coils.
...and then 2 years passed.
Firstly it took a while to purchased the preamps I had chosen, Aguilar OBP-3SK/PPs (keep in mind that every purchased was x3 in number and cost, as I had decided to do them all at once simply for the sake of getting it done - call it the "Anal-Retentive Bassist" in me So finally, after a few PMs traded back-and forth between myself and Anthony "Nino" Valenti regarding a few sets of custom underwound Big Singles that he had ordered with great success that gives the pickups a touch more aggressiveness and a bit less "thickness", one set that is actually in one of his "Main Players" and one last call to Nordstrand and a conversation with Mike at Nordstrand about the possibility and positives/negatives of having that done, I FINALLY placed the order for 1 set of Big Singles in EMG-35 shells and 2 sets in EMG-40 shells, all underwound 5% through Brian @ BestBassGear.com... yet another great guy who took a significant portion of his workday to blab about the whole rambling story above while letting me know exactly what measurements he and Nordstrand would need for proper string-spacing and fitting.
Hopefully in about 4-6 weeks, the usual wait for custom orders, I'll have the pickups in hand and ready to head out to the local tech for installation... although if there's a TB member in the Akron/Cleveland, OH area good with a soldering iron, Aguilar OBP-3 experience, and willing to help out a financially tight fellow member I'll certainly spring for the Pizza 'n Beer.
Updates as they come...