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HMD8 DSP/
USER’S MANUAL
6.4.3
INPUT CHANNELS
The Input channels depend directly on the currently selected source. Each source has its number of inputs and its
type of inputs. In this amplifier the input channels are analog for the MASTER source and digital for the OPTICAL
source.
The image below shows the sensitivity scale for an analog input channel: the
value at the top indicates the lowest sensitivity level; the value at the bottom
corresponds to the highest sensitivity level. The scale has double values: they
are related to the type of analog input connector used, i.e. SPEAKER IN or PRE IN.
Remark:
to perform the procedure it is recommended to use the TEST track
(Track 1_sinesweep)
on the supplied CD or downloadable from the
website
Procedure for sensitivity adjustment:
Step by step select an ever increasing sensitivity (i.e. decreasing numerical
values on the scale) as long as the LED of the digital clip remains off.
The input channel can be:
• renamed;
• disabled / enabled.
The image below shows one of the input settings panels for the MASTER source.
•
ANALOG INPUT CHANNELS
The image below shows the inputs panel for the MASTER source.
1
2
3 4
Input channel name:
this label is read-only.
Sensitivity:
selection of the input sensitivity through the
drop-down menu.
Digital clip:
the LED lights up if the channel saturates the
digital dynamic of the input converters.
Input settings panel:
access the input settings panel.
1
2
3
4
WARNING:
the head unit level must be adjusted to the maximum
undistorted
level. If the initial head unit distortion level can not
be determined, adjust the volume to approximately 80% of its
maximum. If the head unit output level is set too low, the device
may produce ground noise (hissing sound) when playing music
tracks. This is due to the low signal / noise ratio provided by the
head unit to the amplifier input. If you experience this problem,
increase the head unit volume.
Remark:
after adjusting the head unit level, select the sensitivity value that
does not cause clipping on the inputs.
Remark:
repeat the sensitivity adjustment operation for all the
analog inputs used.
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