Classe Audio Delta PRE Owner's Manual page 9

4 IR Window
The location of the IR (infrared) receiver for the remote control is behind
this window. In most cases, there must be a clear path between the IR
window and the remote control in order for the Delta PRE to acknowledge
the remote control commands.
If the IR window is not in view, for example if the unit is placed in a
cabinet or closet, then the rear panel IR input can be utilized for remote
control. For more details about this option, see the IR input description in
the Rear Panel section found later in this manual.
5 USB Host Connector
The front panel USB connector allows the Delta PRE to work with
Apple's portable media devices such as iPad™, iPod® and iPhone® which
require this type of connection. The front panel USB connector accepts
digital audio from these devices (up to 96 kHz) and provides power for
recharging them. Limited control is also available for these devices using
the navigation keys on the Delta PRE remote control.
The front panel USB connector is also used to load firmware updates.
When updates are posted in the software downloads section of the Classé
web site, they may be loaded onto a USB stick and plugged into the front
panel of the Delta PRE. More information on this can be found in the
Firmware Updates section of this manual.
6 Headphone Jack
The 1/4 " (6.35mm) Headphone Jack accommodates stereo headphones.
Inserting a headphone plug mutes the main audio outputs.
7 Volume Control Knob
The large rotary knob on the right side of the front panel controls the
system volume level. It is also used for adjustments such as balance, input
offset and levels for the EQ and Tone Control.
T he volume knob increases and decreases volume in precise 0.25 dB
increments throughout most of the volume range. At extremely low
volume, the step size is increased somewhat to facilitate moving between
extremely low and normal listening levels. The volume range is from
-93.00 dB to +14.00 dB.
The volume control expresses the degree of attenuation or amplification
being applied to the incoming signal. Therefore, a setting of -23.00
indicates that the signal is being attenuated by 23.00 dB.
Most stepped attenuators offer too few steps, causing the listener to
choose a level that is a bit too soft or too loud, not just right. The volume
display on the touchscreen reads in 0.25 dB increments , thereby closely
approximating a continuous volume control, allowing the desired level to
be selected precisely as required for critical listening.
A volume setting of 0.00 indicates that no attenuation or amplification is
being applied. This is the setting used for the Pass-Thru mode explained in
the Source Setup description in the Menu System section of this manual.
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