darTZeel Audio NHB-108 A version - Manual (Page 14)

darTZeel NHB-108 model one Owner's Manual Page 14 of 17
Alternatively, maybe your room is too
big, and that even with your old 1200
watts per channel powerhouse amp,
there was only just enough volume?
In such a situation, please do not
hesitate to consult us. We will try to
help you find a solution.
B) The volume setting of your preampli-
fier is close to maximum.
This can occur if you use either a pas-
sive or a low gain preamplifier.
The darTZeel NHB-108 model one has a
gain of 26dB, which is slightly lower –
two times – than usual. If you think
that the preamp you are using is the
preamplifier you want to die with, we
can adjust, to a large extent, the gain
of the darTZeel NHB-108 model one, for
appropriate matching.
However, this is a delicate task and
must be done by a qualified person
with a well-equipped workshop.
7.2.6. Sound too loud
Please realize that the sound of a
darTZeel NHB-108 model one can never be
too loud!
More seriously, you could find yourself
always using the volume control of your
preamplifier in the first quarter of its full
range, while getting high sound levels.
We can also decrease the gain of your
amplifier to suit your high gain preampli-
fier. Please note however, that we sug-
gest you consult us before thinking of
such a modification.
7.2.7. Blinking Eyes
A) Eyes blink at cold power ON. If your
listening room is at a temperature be-
low 65°F (18°C), this could be consid-
ered as normal, provided that this be-
havior disappears in the following 3 to
5 minutes.
In a room at a temperature above
65°F (18°C), blinking eyes indicate
that your darTZeel NHB-108 model one
could do with some tuning. However,
if this behavior ceases after 3 to 5
minutes, and especially if you can put
up with it, no adjustment is manda-
tory.
B) Eyes blink after several hours, when
the machine is hot, or even very hot
If your room temperature is above
90°F (32°C), this can be considered
as normal behavior, and normally the
eyes should stop blinking as soon as
the ambient temperature return to
"human being" levels.
Please also check that your darTZeel
NHB-108 model one is properly venti-
lated, as indicated in chapter 4.1. "Lo-
cation"
and that you are not using it
at quasi-permanent power clipping
levels with 4Ω loads.
If the ambient temperature is under
90°F (32°C) but the Eyes blink, your
machine needs some tuning.
To cut a long explanation short,
darTZeel's eyes should not blink in ambi-
ent temperature ranges from 65°F to
90°F (18°C to 32°C). If they do, the am-
plifier needs some adjustment.
In all cases it is important to know the
working environment in which you will
use your darTZeel NHB-108 model one.
If you live at the South Pole or on the
Equator, a slightly different setting could
be necessary….
Furthermore, in big ambient temperature
change conditions, we strongly recom-
mend using the version B of the darTZeel
NHB-108 model one.
If you need to know more about this
topic, can you guess what? Yes, read the
Audiophile's technical manual.
7.2.8. Melting Fuse(s) at power ON
The darTZeel NHB-108 model one features
a Crowbar inhibiting circuit working at
power ON. During the first 20 millisec-
onds, no Crowbar operation will occur,
avoiding blown fuse(s) if bumps greater
than 2 volts are detected.
However, if you power your machine ON
again, immediately after having powered
it OFF, it is possible that it will eventually
trigger the Crowbar circuit, and lead to
melted fuse(s). In such a case, you will
have to change the blown fuse(s) as de-