Yeah....pretty sure Hamer just used X2Ns and not the X2NB in the 8- and 12vers. The "B" versions was crazy hot, as noted above like 35k. Plus they are darker sounding, which is not what you would want in an root-octave bass sound.
Plus Hamer commonly used a Bogue preamp/overdrive circuit with/toggle and LED. Overdriving the already hot 15k range X2N is one thing.....trying to overdrive the insanely hot X2NB with that setup would be useless and just cause problems.
Also....Hamer had previously used DiMarzio Model G pickups on the earlier 8-strings, which was replaced by the X2N. In the late 80s Hamer began offering OBL blade pickups as an upgrade, although that was fairly short lived due to supplier Bill Lawrence licensing his OBL name to Gibson and Gibby screwing him by making cheap Asian knockoffs.
But Hamer still used X2N's on custom order basses, by request, even until recent months ( yeah, yeah....Hamer is dead, blah, blah.....but they still have not finished churning out the last of the back ordered custom orders from when they announced they were not taking more new orders in 2012 !!
Plus, there is a new head of Fender coming....so maybe that guy will tell Hamer to start taking orders and stop building friggin Guilds up at the CT shop?!?!)