this is all I could find on it
The HOHNER Professional Series
was developed in the mid 80s in a
collaboration of HOHNER with vintage
guitar legend Thomas Weilbier. Since
then, the HOHNER Headless guitars
and basses with the unique headless
hardware licensed by Steinberger® have established
themselves as a legendary niche.
The instruments are short, light and ideal for travel. The G3T
headless guitars are just under 80cm long and the B2 basses
just under 1m, yet both series provide a full scale!
Bronislav Kovarik aka Bruno (Hypnos, ex Krabathor)
B2ADB
B2AV
B2B
G3T
B2ADB
The active HOHNER B2ADB 4-string headless bass comes with a detonable
bridge licensed by Steinberger, active electronics and two humbucking EVL
pickups, two active tone controls, two volume controls and one concentric
tone control. The B2ADB has an active/passive switch and is one of the very
few active basses that can also be used in passive mode. The active status
is indicated by a red status LED. You will never be down again because of a
drained battery!
Colors: Black (BK) – lefthand model available!, Grey Nickel Stain (GNS),
Oil Finish (OIL) – lefthand model available!
B2A
The HOHNER B2A 4-string headless bass is identical to the B2ADB, except for
the bridge. The B2A comes with a standard 4-string headless bridge licensed
by Steinberger. The HOHNER B2A Headless Bass gives you a powerful sound
with plenty of punch, grunt and bottom end!
Colors: Black (BK) – lefthand model available!
B2AV
The HOHNER B2AV-WS is a headless 5-string bass in the classy walnut stain
with active electronics. It comes with a 5-string bridge licensed by Steinberger,
two EVL J-style pickups, two volume controls and one concentric
tone control. Like the B2ADB, the B2AV is equipped with active tone
control and the active/passive switch with the red status LED and the
foldable leg-rest.
Colors: Black (BK)- lefthand model available
http://www.manualslib.com/manual/280208/Hohner-Essential-Series-Essential-Folk.html?page=12