P81537 G
Sheet 3 of 5
GND
24
24
GND
AMPLIFIER
LINE MATCHING TRANSFORMER
T
R
1/4 W
VOLT
25 OR 70
25 OR 70 VOLT
WITH TAPPED PRIMARY WINDING
R
T
TAP
(S)
(P)
(P)
(S)
COM.
COM.
1/4 W
25V
T
R
PRM
150
GND
24
TO 25V
OR 70V
AMPLIFIER
OUTPUT
TO EXISTING
SPEAKER/
TRANSFORMER
TO PRM-150
INPUT (T&R)
NEW AMPLIFIED SPEAKERS
(TYPICAL)
(P)=PRIMARY
(S)=SECONDARY
TO ADDITIONAL
AMPLIFIED
SPEAKERS
(MAX. 150)
TRANSFORMER
SPEAKER/
TO EXISTING
WITH TAPPED SECONDARY WINDING
25 OR 70 VOLT
LINE MATCHING TRANSFORMER
Figure 5.
PRM-150 as a central (master) volume control for a group of speaker amplifiers used to expand 25V and 70V central amplifier
systems.
SPECIFICATIONS:
Table 1.
Nominal Input Voltage
-24VDC
Input Voltage Range
-18VDC to -28VDC
Maximum Input Current at 24VDC
35mA
Audio Input Level (T-IN and R-IN)
-15dBM (0.1V RMS) TO +10dBM (2.4V RMS)
Input Impedance
600 Ohms
Output Impedance
4 Ohms
Output Gain (T-OUT and R-OUT)
0 to +15dBM Maximum into 4 Ohm Load
Output Drive Capability
150 Speaker Amplifiers - Maximum
Frequency Response
70Hz to 14kHz
INSTALLATION INFORMATION:
The PRM-150 Preamplifier Module is designed for wall mounting. First remove the knob, by loosening the knob set screw. Next
remove the housing by removing the screw on the top of the housing. Mount the base using the mounting screws (provided) as per
template (See Figure 6).
KNOB
INPUT/OUTPUT LINES
INPUT/OUTPUT TERMINALS
MOUNTING HOLES
4
5
6 7
8
9
1
0
REMOVABLE COVER
2"
Figure 6.
Mounting Screw Template
