4
MUSIC-ONLY SPEAKER SYSTEM
A separate radio/music source may be connected to a non-
intercom IMA-516 speaker system to provide a music-only
system.
MODEL 301T
TRANSFORMER
18 / 2 (NUTONE S-143)
120vAC,
60Hz HOUSE
POWER
OBSERVE
LOCAL CODE
DECREASE
DECREASE
INCREASE
INCREASE
INTERCOM VOLUME
CONTROL
OUTPUT
HI
RED
OUTPUT
LO
RED WHT
INPUT
ORN / WHT
DOOR
BLK
DOOR
BLK / WHT
CHIME
AC
RADIO VOLUME
CONTROL
INPUT
ORN
FIELD
GROUNDING
WIRE
NUTONE IW-2
LOW-LEVEL
INPUT WIRES
BLUE & BLACK
CHIME
IMA-516
AC
MODELS IS-75,
IS-76, ISA-77
ISA-78, IS-79
IC-501 (OBSOLETE)
VOLUME CONTROL
NUTONE IW-2 (MAX. 500 FT. TO 2 SPKR.)
(MAX 250 FT TO 4 SPKR.)
(MAX 125 FT. TO 8 SPKR.)
LOW-LEVEL RADIO/MUSIC OUTPUT
(1) NuTone Radio-Intercom. Low-level music output
provided - black and blue wires; connect with IW-2
(max. 10 ft.) to black and blue input wires on IMA-516
Amplifier.
(2) Existing stereo receiver with tape output jacks. Make
connection from black and blue low-level input wires
on IMA-516 Amplifier - to - tape output jacks (use “y”
adaptor to make connection to both channel A and B
jacks). Use IW-2 (max. 10 ft.).
(3) Speaker connected to an existing AM/FM radio music
source. use IW-2 (max. 10 ft.) to connect the
IMA-516 low-level input leads to the speaker
terminals.
SPECIFICATIONS FOR LOW-
LEVEL OUTPUT CONNECTION
(1) Minimum 5mv for 50mw output
(least useable output).
(2) 50 mv for 4 watts (full output).
(3) Maximum input voltage: 1 volt.
(4) Input impedence: 100k ohms.
Procedure for this connection:
(1) Turn Radio Volume Control on
IMA-516 Amplifier to minimum
(extreme counterclockwise
position).
(2) Make wire connections.
(3) Supply power and adjust the
radio-music volume at the
source.
(4) Finally, increase IMA-516
Radio Volume Control to
desired level.