Astralbirth has been in touch regarding the new Bartolini 1-CB pickups. I was unaware of these. I'd say Clyde introduced them this year.
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They are not specifically marketed as being for Steinbergers, but for Gibson basses. However, the size is standard humbucking and so they'll fit in Spirits. These have four-conductor wiring, so coil splitting options are available, some may want to play with series/parallel switches. The EMGs are two-conductor wired, so that's not available with them.
Here is the link to the Bart Vol/Blend/Concentric tone harness:
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I doubt any of the Megathread people have had a chance to try these out, but they do sound promising as an alternative to the EMG HBCS. If anyone gets these, please post a report here.
From the product page, linked above:
"Original Bart upgrade pickups provide bottomless lows and low-mids, their dual coil construction eliminates the noise and muddiness that vast amounts of low-end can create. The Originals are full and warm for that vintage voice you've been craving, enhancing the natural voice of your bass. You'll never find lower tones produced with higher clarity!
Made for pro-level bass players, they are fully sealed and shielded making them sweat-proof, quiet if you touch them, and immune invisible noise from stage lights and studio power supplies. The cables are shielded too.
Available in balanced versions for neck (Bass, -B) and bridge (Treble, -T)."
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