Henry Engineering MULTIPHONE-II Specifications

MULTIPHONES II

TM

Description

MULTI-USER HEADPHONE SYSTEM WITH ZONED TALKBACK

MultiPhones 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.

The 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 thr
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”.

The 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 Pods.

ee Talkback zone outputs in any combination. The zones are

Each Guest Pod contains a stereo headphone amplifier, volume control and headphone
jacks. Both 1/4” and 1/8” (3.5mm) jack ar
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.

The 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.

The MultiPhones II Master unit is power
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 chassis.

e provided. A pair of (parallel) RJ45 jacks

ed with a built-in AC power supply. It is 1/3

Front Back

Technical Specifications, complete system

Program Input -15 to +0 dBm, stereo, 10K bal / 5K unbal

alkback Input

T
Frequency Response 5Hz – 20 kHz, +/- 0.25 dB
Distortion .005% typical
Noise -80 dBm
Outputs For 24-600 ohm headphones
Talkback control Contact closure (GPI)
Power Requirement* 115/230 VAC, 50-60 Hz, 8W
Approvals* City of Los Angeles Elect. Test Lab, CE
Construction* Steel enclosure
Physical, Master unit 5.75”w X 5.50”d X 1.60”h, 3 LBS
Physical, Guest Pod 4.00”w X 3.00”d X 2.25”h, 1 LB
Cut-out, Guest Pod 3.75”w X 1.75”h

*Master unit only Specifications subject to change without notice.

Either bal. mic or line, switchable, mono

Typical Application

PROGRAM AUDIO

TALKBACK AUDIO

GUEST PODS

UP TO 12 UNITS

Guest Pod can be mounted

in cabinate cut-out

MULTIPHONES MASTER UNIT

A B C

Guest Pod mounted in

desk-mount chassis, included

500 Key Vista Drive

Sierra Madre, CA 91024

TEL [phone]
FAX [phone]

yeng.com

.henr

www