WARNING:
The default volume setting is at maximum volume (100). If you plan to use the HD25 as
a pre amplifier you MUST turn the volume down before starting to play music. Not doing so may
cause severe damage to your amplifier and loudspeakers.
Filter:
The HD25 can be switched between two different digital filter modes.
This is done with the FILT (7) button.
By pressing FILT once, the current selected filter will be displayed. By pressing it again, the filter will
change.
F.1 (default) is the normal filter.
F.2 is a minimum preringing and low latency filter
Display:
If you are listening in a dark room you may want to turn off the HD25’s display. Pressing and holding
the DISP-button (9) for approximately one second will turn the display off. A short press of the DISP-
button will turn the display on again. If the display is turned off, any use of the HD25 function buttons
will turn the display on temporarily to express the current status of the HD25. After a few seconds it
will automatically turn off.
PC/MAC remote control functions and a word about USB
When you connect the HD25 to a computer with a USB cable (not included) it will automatically
install itself as a USB soundcard on all newer versions of Windows and MAC OS. We recommend that
your computer is connected to the internet during the installation process. We also suggest that you
close all media players, such as iTunes or Windows Media Player before connecting the HD25. Please
do not use a longer USB cable than necessary.
USB Mode Setting:
The USB mode selector switch on the rear panel determines the mode setting of the USB audio
interface. Please note that the USB connector must be disconnected before changing this setting.
With the switch set to “A” (default) the USB audio interface is set to plug & play mode, and up to
96kHz 24bits resolution can be achieved.
With the switch set to “B” the USB audio interface can achieve up to 192kHz and 24bits resolution.
This mode is plug & play when using MAC. If you are using a PC running a Windows operating
system, an additional driver has to be installed on the computer. To download and install the driver,
please consult the HD25 section of the Hegel website.
Troubleshooting:
MAC – After installation you may need to go to “System Preferences – Sound – Output” and choose
your USB Audio DAC as the output device.
24 bit Audio:
The HD25 can receive 24 bit music files through the USB interface. Getting 24 bit audio signals from
your computer may require set-up in your media player. This may vary depending on operating system
and media player. Please consult the FAQ section for your software. For playing CD-quality files (or
lower) no additional set-up is acquired.
