PA71
MicroMix
Power Ampli er
Quick Start Guide
Salt Lake City, Utah
4/15
PA71
MicroMix Power Ampli er
• RCA Inputs
• XLR Mic Input
• Spring-loaded, and 1/4" output
• Low noise, e cient operation
The PA71 mixes an unbalanced line level
signal with a mic signal to a powered 1/4" or
speaker terminal outputs. The unit is perfect
for small speakers in small environments.
MIC
IN PU T
LINE
IN PU T
LINE/
POWER
OUT
SPEAKER
OUTPUT
PS15
15V D C
PWR
LINE
LEVEL
MIC
LEVEL
PHANTOM
POWER
MADE IN USA
www.rolls.com
on off
1
Rolls Corporation
5968 S 350 W
Murray Utah 84107
120 February 2015
Size: Document Number:
Date:
Rev:
Sheet of
Ba
7W POWER AMP PA71b
PA71b.SCH
A
2
3
1
J5
JAPDC
D5
LDRG
P2
P100K
R13
100
R14
47
C16
47U
R15
10K
VOLUME
1
2
J4
CON2
J3
PHONE 1/4
C17
2200UF 16V
+V
1
3
2
J2
PCRCAX2
R8
22K
R7
22K
R11
22K
2
3
1
4
U2A
4560
6
5
7
8
U2B
4560
C8
25PF
C6
470PF
C5
470PF
1 2
3
J1
XLR F PC
R3
332 1%
R4
332 1%
R6
22K
R5
22K
R12
22K
C7
1U
C4
47U
C3
47U
C1
47U
C2
47U
R2 4.99K 1%
R1
4.99K 1%
P1
P100K
R19
22K
R9
18K
C12
47U
1
H1A
HD3
2
H1B
HD3
3
H1C
HD3
R10
330
C9
47U
Q1
PN100
R17
47
R18
47
R20 100K
C10
470U
3
2
1
4
U1A
4556
C13
120PF
C11
10U
R16 10K
+V
6
5
7
8
U1B
4556
R21
1
Q3
TIP41
Q2
TIP42
INTRODUCTION
Thank you for your purchase of the PA71 MicroMix Power Ampli er. This unit
mixes a stereo RCA signal with a microphone to a 1/4" line level output and a
powered spring loaded speaker output. The unit for powering small speakers
in small environments.
DESCRIPTION
REAR PANEL
LINE INPUT: RCA line level inputs (mixed to mono)
MIC INPUT: Balanced XLR input for connection to a dynamic or con-
denser microphone.
LINE/POWER OUT: 1/4" TS output.
SPEAKER OUTPUT: Spring-loaded output terminals - the red terminal is
positive and the black one is negative.
PS15/15VDC: For connection to the included power supply.
SIDE PANEL
PHANTOM POWER: Jumper pin for connecting 15 volts of phantom power to
the Mic Input.
FRONT PANEL
LINE LEVEL: Adjusts the level of signal from the Line Input to the Line/
Power and Speaker outputs.
MIC LEVEL: Adjusts the level of signal from the Line Input to the Line/
Power and Speaker outputs.
CONNECTION / OPERATION
Connect input sources such as CD players or cassette players to the
RCA inputs, connect a microphone to the balanced XLR Mic Input. If the
microphone is a condenser type, move the Phantom Power jumper to
connect the indicated pins.
SPECIFICATIONS
Line Input Impedance: 47K Ohms
Mic Input Impedance: 600 Ohms
Phantom Power Voltage: 15 V
Power Output: 5 Watts (8 Ohms)
Voltage Gain: 40 dB
Maximum Supply Voltage: 15 VDC
THD: .05% typical
EIN: 3 mV
E ciency: 65%
Input Sensitivity: 28 mV
Bandwidth: 20Hz - 25 kHz
Size: 4.25" x 2.375" x 1.5"
Weight: 1 lb.
MIC
INPU T
LINE
INPU T
LINE/
POWER
OUT
SPEAKER
OUTP UT
PS15
15V D C
PWR
LINE
LEVEL
MIC
LEVEL
PHANTOM
POWER
MADE IN USA
www.rolls.com
on off
SCHEMATIC
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