XI AUDIO HP505, Mini Instruction Manual, Page: 3 / 12

XI Audio HP-505 is a stereo headphone amplifier and control panel for broadcast studios. The
HP-505 can be mounted directly on the desktop or can be flush mounted. The HP-505 works
with all Axia devices that have an Axia GPIO port, but can be used with other broadcast
systems as well. It provides remote control of mic on/off functions.
Dedicated Mute and Talkback buttons give talent
full control. The buttons can be programmed to
use one of the eight predefined colours using the
DIP switches on the rear panel.
Multiple HP-505’s can be daisy-chained using
CAT5/6 cabling and the Loop-Thru port to
produce a multi-user headphone listening
system. The unit can be powered from a POE
switch or POE Injector. The HP-505 is optimized for
use with contemporary high-efficiency head-
phones. Each HP-505 contains its own amplifier so
any combination of different headphones can
be used. There is no interaction between units
and no degradation of audio performance.
The HP-505 features a volume control and 2
headphone jack sockets - 1/4” and 1/8” (3.5mm)
which allows both standard and mini head-
phones to be used. A volume control knob allows
full control of headphone level. There is also an
1/8” stereo line input jack socket on the panel
1
HP505 MINI INSTRUCTION MANUAL
INTRODUCTION
allowing audio to be played from devices such as
mobile phones or tablets.
On the back panel there are total 6 RJ45 (Cat 5/6)
connectors. All audio input/output and GPIO
connections are made through these connec-
tors. The GPO socket is intended for connection to
an XI Audio GPIO dongle, allowing GPIs of an Axia
xNode (or similar) to be triggered from the Talk
Back, Mute or Mic Buttons.
Stereo Line Input Connector
This 3.5mm jack socket is located on the right side
of the front panel above the volume control. The
input is balanced up, given 12dB of gain and
routed to the rear panel output.
The connections are as follows:
Tip: Left Ring: Right Sleeve: Screen
Headphone Connector 6.35mm
This .1/4” (6.35mm) jack socket is located on the
left of the front panel above the volume control. It
is connected to the headphone amplifier in
parallel with the 3.5mm headphone jack socket.
The maximum output is +18dBu.
The connections are as follows:
Tip: Headphone Left Ring: Headphone Right
Sleeve: Ground
Headphone Connector 3.5mm
This 3.5mm jack socket is located at the centre of
the front panel above the volume control. It is
connected to the headphone amplifier in parallel
with the 6.35mm headphone jack socket. The
maximum output is +18dBu.
The connections are as follows:
Tip: Headphone Left
Ring: Headphone Right
Sleeve: Ground
Headphone Volume
This is the volume control of the headphone
outputs with a range of +12dB to -60dB using a
logarithmic potentiometer.
Talkback Button
This button, when pressed briefly (less than 350ms)
activates and latches pin 3 of the GPO RJ45.
When pressed for more than 350ms the button
and GPO output act momentarily and deactivate
when released. The button illumination responds
to pin 3 of the GPI RJ45.
Mute Button
This button, when pressed briefly (less than 350ms)
activates and latches pin 5 of the GPO RJ45.
When pressed for more than 350ms the button
and GPO output act momentarily and deactivate
whenreleased. The button illumination responds
to pin 5 of the GPI RJ45.
Mic Button
This button, when pressed briefly (less than 350ms)
activates and latches on the GPO on pin 1 of the
RJ45. Pin 2 provides an inverted output of pin 1.
When pressed for more than 350ms the button
and GPO output act momentarily and deactivate
when released. The button illumination responds
to pins 1 and 2 of the GPI RJ45 All button illumina-
tion colors can be changed using the 4 pole DIP
switch on the back panel. There are 8 color
choices in total: off, red, green, blue, cyan,
magenta, yellow and white.
DIP Switch
DIP Switch 1: LED current bit 1 (see table)
DIP Switch 2: LED current bit 0 (see table)
DIP Switch 3: Enables/disables LED color
programming mode (see table)
DIP Switch 4: Determines which switch state
programming mode is active on (DIP off = off
color, DIP on = on color) (see table)
LED Color Programming (on start-up)
When DIP3 is enabled on power up, the unit will
enter programming mode. Each button illumi-
nates in the color designated for its off or on state
(controlled by DIP4). The user can press each
button to cycle through 8 color options to set the
desired color. Setting DIP3 switch back to off
stores the colors to EEPROM and enters normal run
mode. See programming mode flowchart for
more information.