darTZeel Audio NHB-108 B version - Manual (Page 10)

darTZeel NHB-108 model one
User Manual, version B 1.0 Page 10 of 35
6.3. User parameters
The darTZeel NHB-108 model one must be cor-
rectly set, accordingly to the loudspeakers' nominal
impedance. Your machine is already factory set for
speakers having nominal impedance from 3Ω to
8Ω, as is usually the case.
If your loudspeakers' nominal impedance is be-
tween 1.5Ω and 2.5Ω, or if you connect two paral-
leled 4Ω speakers, you
must adapt your NHB-108
to that load. If you want to know more about this
special mode, please refer to the technical section.
The procedure for the adaptation of the output im-
pedance is described hereunder:
Power the machine OFF.
!!! UNPLUG THE AC CORD FROM THE WALL,
and please wait for 5 minutes !!!
Disconnect all links you may have installed by
removing all cables from inputs (4), (5) or (7), and
from Speakers Terminals (6). Unscrew the single
central cover screw, and remove the smoked glass
using the supplied suction grips, as shown in fig.1
Gently wet them in order to get firm vacuum.
Please be very careful when removing the cover,
since it is real tempered glass, not Plexiglas
tm .
Fig.1 – Suction grips
The speaker's impedance switch is located at the
upper left of the transformer (upper right for the
right channel),
Fig.2 – Speaker's impedance switch
as shown in Fig.2
When the switch is pointing towards the front plate,
you are in Lo mode, suitable for 1.5
Ω to 2.5Ω
speakers. In this mode, you can also parallel 2 pairs
of 4
Ω speakers.
By flicking the switch towards the rear panel direc-
tion, you set the Hi, default mode, for speakers of
3
Ω or more. This is the most often used configura-
tion.
The darTZeel NHB-108 model one being a true
dual mono design, you can also use it to biamplify
hybrid loudspeakers (having different technology
and impedance drivers, i.e. an 8
Ω woofer and a 2Ω
tweeter) by switching one channel to Hi and the
other one to Lo, respectively.
Please bear in mind that in this case, you will need
two NHB-108 model one, one for each loudspeaker.
Once you have chosen your configuration, you can
carefully put the glass cover back, and screw it on
again as follows:
Freely hand screw until you feel the thread-end
resistance. Then use the supplied screwdriver and
turn an extra 1/8 turn approximately. The screw
must be sufficiently tightened to prevent the possi-
bility of the glass rotating around the screw axis.
Then reconnect all the wires and cables, paying
special attention to the loudspeaker cables. They
must be hooked to the Speaker Terminals (6) be-
fore powering the amplifier ON.
Now just sit back and relax, and immerse yourself
in pure musical pleasure!