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MULTIPHONES GUEST POD II
HEADPHONE AMPLIFIER with TALENT CONTROL
HENRY ENGINEERING
PO Box 3796
Seal Beach, CA 90740
Tel: 562.493.3589
www.henryeng.com
DESCRIPTION
The MultiPhones Guest Pod II is an individual headphone listening station for use with the MultiPhones Distributed
Headphones System. It features a high performance headphone amplifier, plus two illuminated pushbuttons that
are typically used by talent for “Cough” and “Talkback” functions. When used with the MultiPhones Master unit,
power and audio are supplied by the Master. The Guest Pod can also be used as a “stand alone” headphone
listening station (without a MultiPhones Master unit) if other powering is provided. The Guest Pod includes a Level
control and both ¼” and 3.5mm headphone jacks.
INSTALLATION
The Guest Pod II is designed for tabletop, under-counter, or in-cabinet installation. For tabletop use, install the
rubber “feet” on the bottom of the enclosure. Another option is to install two #8 screws in the tabletop, 3” apart, and
slide the unit onto the screw heads. For under-counter installation, open the Guest Pod enclosure by removing the
four corner screws from the bottom of the unit. Remove the top of the “clamshell” enclosure. Drill screw holes in the
top as necessary and screw the top to the underside of the countertop. Re-attach the lower section to the top with
the bottom screws. The Guest Pod II can also be mounted into cabinetry using the optional Cabinet Mounting Plate.
For use with MultiPhones Master unit: The Guest Pod(s) is connected to the MultiPhones Master unit using cat5
cabling. In most cases, unshielded cables can be used. WARNING! DO NOT USE “CROSSOVER” CABLES.
Connect up to 3 Guest Pods directly to the MultiPhones Master unit. Each Guest Pod has 2 RJ45 connectors,
which are wired in parallel. (Use either connector.) Additional Guest Pods can be “daisy chained” together in any
combination. The total number of Guest Pods connected to one MultiPhones Master should not exceed 12 units.
For use as a “stand alone” headphone listening station: For “stand alone” use, the Guest Pod requires a
power source. Henry Engineering’s PowerPod or any 9-12 volt AC transformer may be used. The PowerPod will
power up to 12 Guest Pods. If a 12V AC transformer is used, each Guest Pod will require about 50 mA.
Two ¼” TRS input jacks on the rear panel accept stereo balanced audio at about 0 dBu.
Wire the inputs as follows: Tip = High; Ring = Low; Sleeve = Ground.
Multiple Guest Pods can be used by “daisy chaining” them together with cat5 cabling. Both power and audio will be
distributed to all Guest Pods via the cat5 cables. (To distribute power but not audio, remove R1, R19, R21, & R22
from each Guest Pod unit in the system.)
Talent control buttons: The two talent buttons (Cough and Talkback) must be wired to the Control RJ45
connector by the user. Any pin-out can be accommodated. Install wires between the switch terminals and the PC
board pads labeled W1 thru W8, which correspond to the pins on the Control RJ45 connector. Be sure to install a
resistor in series with the LED in each switch according to the tally supply voltage being used. (12vdc = 2K ohms.)
See the schematic on the reverse side for switch terminal details.
OPERATION
The Guest Pod II is simple in its operation. The LEVEL controls adjust the audio level to the PHONES jacks. Do
not use both jacks at the same time. Use headphones with an impedance between 24 and 600 ohms.
Do not use older “8-ohm” headphones. Excessive listening levels can cause permanent hearing damage!
SPECIFICATIONS
INPUT From MultiPhones Master unit or
¼” TRS jacks, 2X, 0 dBu, balanced 20K
OUTPUT For 24 – 600 ohm headphones, ¼” and 3.5mm jacks
FREQUENCY RESPONSE 5 Hz – 20 kHz, +/- 0.25 dB
DISTORTION .005% typical
NOISE -80 dBm typical
POWER INPUT Supplied by MultiPhones Master unit, PowerPod,
or 9-12 VAC transformer, 50mA per unit
PHYSICAL DIMEN 5.75”w X 1.75”h X 6.0”d, 1 LB
MOUNTING PLATE (optional) 5.5”w X 1.5”h, 6.0” behind panel; cutout: 4.5”w X 1.0”h
Specifications subject to change without notice. Rev. 1/19
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