darTZeel Audio NHB-108 A version - Manual (Page 9)

darTZeel NHB-108 model one Owner's Manual Page 9 of 17
If you still hear some thumping at pow-
ering OFF, you will have to wait around
10 seconds before switching the pream-
plifier OFF. This noise, however, will be
inconsequential and harmless.
5.2. darTZeel's Eyes
The 2 giant orange LEDs, called Eyes (2)
for obvious reasons, are fully featured
function indicators. Five different illumi-
nation states, for each individual chan-
nel, are described hereunder:
1) Eyes shut (light off). This is of course
the status when the darTZeel NHB-108
model one is either powered off or not
plugged in. If one Eye only is shut, it
means that there is a power fault or
a blown fuse in the channel in ques-
tion. In the latter case, please go to
chapter 6.1."Fuse(s) replacement".
2) Idle state. 45 to 55 seconds after pow-
ering ON, and with no input signal,
the Eyes go into this barely illumi-
nated state.
3) Signal presence. When an input signal,
corresponding to over 10 mW at 8Ω
is detected, the Eyes illuminate fully.
You are in "musical cruise mode".
When the input signal disappears for
more than 45 to 55 seconds, the
Eyes go back to idle state.
4) Clipping. When approaching maximum
output power, the corresponding Eye
flashes brightly for about half a sec-
ond, and then goes back to the "mu-
sical cruise mode".
5) Blinking. If an Eye blinks, it means
that absolute DC voltage greater than
0.6 volt is present at the correspond-
ing output. This indicates that your
machine could do with some recali-
bration, though it is still working per-
fectly, musically speaking.
If absolute DC voltage continues to
grow until reaching 2 volts or more,
the Crowbar circuitry will immediately
short circuit the corresponding power
supply, protecting your precious
loudspeakers.
5.3. User parameters
The darTZeel NHB-108 model one must be
correctly set, accordingly to the loud-
speakers' nominal impedance. Your ma-
chine is already factory set for speakers
having nominal impedance from 4Ω to
8Ω, as is usually the case.
If your loudspeakers' nominal impedance
is between 1Ω and 2Ω, or if you connect
two paralleled 4Ω speakers, you must
adapt your darTZeel to that load. If you
want to know more about this special
mode, please read the Audiophile's tech-
nical manual.
The procedure for the adaptation of the
output impedance is described here-
under:
Power the machine OFF.
!!! UNPLUG THE AC CORD FROM THE
WALL, and please wait for 5 minutes !!!
Disconnect all links you may have in-
stalled by removing all cables from in-
puts (4)
, (5) or (6), and from Speakers
Terminals (7)
. 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 care-
ful when removing the cover, since it is
real glass, not Plexiglas tm .
Fig.1 Suction grips