II is a multi-user headphones system for broadcast
studio, professional audio, and similar applications.
It provides independent stereo headphone listening
facilities with Zoned Talkback for multiple users.
The MultiPhones II system consists of the Master
unit and up to 12 satellite Guest Pods which are
interconnected using standard CAT5 cabling.
MultiPhones II Master unit distributes Program
audio to all Guest Pods via three outputs. Although
the Program audio is identical, each output is
an isolated Talkback zone. Guest Pods can be connected
to the three Talkback zone outputs in any combination.
The zones are addressed via the three Talkback
buttons on the front of the Master unit. This
allows a producer or call screener to communicate
with Guest Pod listeners in each zone, e.g., “Host”,
“A-Guests”, or “B-Guests”.
MultiPhones II Master unit has inputs for stereo
Program audio, Talkback audio, and remote Talkback
control. Master Level trimmers for Program and
Talkback allow the user to preset maximum levels.
The Zoned Talkback system allows a producer or
studio engineer to speak to Guest Pod listeners
in each Talkback zone, overriding normal Program
audio with Talkback mic audio. The Talkback function
can be remotely controlled. Three RJ45 jacks are
provided to distribute audio and power to the
Guest Pod contains a stereo headphone amplifier,
volume control and headphone jacks. Both 1/4”
and 1/8” (3.5mm) jack are provided. A pair
of (parallel) RJ45 jacks on each Guest Pod permit
multiple units to be “daisy chain”
connected to each Master unit output. As a convenience,
each Guest Pod has a “cough button”
and “mic-on” LED that can be wired
to the user’s audio console or other equipment,
although these functions are not part of the MultiPhones
II system per se.
MultiPhones II system is optimized for use with
contemporary high-efficiency headphones with impedances
between 24 and 600 ohms. Because each Guest Pod
contains its own amplifier, any combination of
different headphones can be used. There is no
interaction between units, and no degradation
of audio performance regardless of the number
of Guest Pods used. The system uses low-Z balanced
audio distribution so that long cable runs do
not affect audio quality.
MultiPhones II Master unit is powered with a built-in
AC power supply. It is 1/3 rack width and can
be rack-mounted with the optional rack-mount shelf,
or cabinet or wall mounted using optional cabinet/wall
mounting brackets. The Guest Pods can be flush-mounted
in a tabletop cutout, or mounted on a desktop
or to a cabinet using the included desk-mount