Crown Audio 135MA - Manual

T he Cr own
®
135MA and 160MA are high-
value mixer-amplifi ers for commercial audio.
They provide 8-ohm and constant-voltage
outputs (70V and 100V). Typical uses are paging,
background music, and music-on-hold.
The 135MA provides 3 inputs (each with a volume
control) and a 35W amplifi er output. The 160MA
provides 4 inputs (each with a volume control)
and a 60W amplifi er output.
Other features include priority muting, voice-
activated muting, phantom power, and Bass and
Treble controls.
Specifi cations
Performance
Frequency Response (at 1 watt from line out):
50 Hz to 20 kHz ± 1 dB.
19 Hz to 34 kHz +0, –3 dB.
Signal to Noise Ratio (ref. to rated power,
master volume at minimum):
Mic: > 58 dB.
Line: > 60 dB.
Telephone: > 60 dB.
Inputs 2 or 3 (and 4 in 160MA): > 78 dB.
THD + N: < 0.5% at rated power at 1 kHz.
< 0.1% at 5W at 1 kHz.
Input Sensitivity (for full output at maximum
gain):
Input 1: Mic 3mV, Line 800mV.
Input 2: 400mV.
Input 3: 400mV.
Input 4 (160MA only): 400mV.
Input Impedance (nominal):
Mic: 2.2 kilohms.
Line: 10 kilohms.
RCA: 10 kilohms.
Crosstalk: –82 dB at 1kHz (Ch. 1 line input 0.8V,
Ch. 1 volume at minimum, other channel volumes
at maximum).
Line Output Level (nominal): 1V into 10 kilohms.
Phantom Power: 15 VDC.
AC Line Voltages Available:
Universal Power Supply. Line voltage tolerance
+15%, –20%.
Operating Temperature/Humidity: 0° C to 40° C
at 95% relative humidity (non-condensing).
Storage Temperature: –20° C to 85° C.
Front Panel Controls and Indicators
Power Switch: Pushbutton on-off switch.
Input Volume Controls: Four controls, one per
input. Detented potentiometers with knobs.
Tone Controls: Bass and Treble non-detented
recessed potentiometers under master output
volume control. Bass ±10 dB at 100 Hz, Treble
±10 dB at 10 kHz.
Power Indicator: Blue LED indicates power on.
Input Signal Presence Indicators: Green LED,
one above each channel's input attenuator, illumi-
nates when input signal exceeds –40 dBu.
Input Signal Clip Indicators: Green LED, one
above each channel's input attenuator, fl ashes
brightly at threshold of audible distortion.
Output Signal Presence Indicator: Green LED
above master output volume control illuminates
when any input signal exceeds –40 dBu.
Output Signal Clip Indicators: Red LED above
master output volume control fl ashes brightly at
threshold of audible distortion.
Master Output Volume Control: Detented potenti-
ometer with knob.
Back Panel Controls, Connectors and
Indicators
AC Power Inlet: Detachable IEC accepts US or
Euro style power cords.
Amplifi er Output Connector: 4-position terminal
barrier block with COM (Common), 8 ohms, 70V
and 100V terminals. Accepts up to 10 AWG termi-
nal forks. Non-touch cover included.
Preamp Line Out Connector: 3-pin balanced
Phoenix-type for connection to external amplifi -
ers. Level independent of master volume control.
Input Connector 1: 5-terminal Phoenix connector.
3 terminals for balanced signal, 2 terminals for
priority contact closure, which mutes other chan-
nels when DIP switch 3 is on.
Input Connector 2: Unbalanced line-level RCA-
type connectors.
Input Connector 3: Unbalanced line-level RCA-
type connectors.
Input Connector 4 (160MA only): Unbalanced
line-level RCA-type connectors.
Telephone (MOH) Output Connector: 4-terminal
Phoenix connector (2 terminals for 1W output to
8-ohm speaker, 2 terminals for 600-ohm output to
PBX music-on-hold port).
MOH Level Control: Trim pot adjusts level for
Music-On-Hold output from Telephone (MOH)
Output Connector.
Amp Confi guration DIP Switch: DIP switch selec-
tion for multiple functions.
1. On: Sets CH1 to Mic Input. Off: Sets CH1 to
Line Input.
2. On: Sets CH1 to Normal mode (no priority).
3. On: CH1 priority contact closure mutes other
channels.
4. On: CH1 VOX mutes other channels by sensing
signal through Input 1.
5. On: Routes CH1 to MOH output.
6. On: Routes CH2 to MOH output.
7. On: Routes CH3 to MOH output.
8. On: 15V phantom power.
C O M M E R C I A L A U D I O S E R I E S
• 3 inputs (each with a volume control), and one
35W amplifi er output channel in 135MA
• 4 inputs (each with a volume control), and one
60W amplifi er output channel in 160MA
• Ideal for paging, background music, and
music-on-hold
• Balanced Phoenix-type mic/line input,
telephone output, dual RCA stereo music
inputs, screw-terminal speaker outputs
• Priority muting by VOX or external switch
• Bass and Treble controls on master output
• Three-Year, No-Fault, Fully Transferable
Warranty completely protects your invest-
ment and guarantees its specifi cations
Features
135MA
160MA
1 kHz
Power
35W
Minimum guaranteed power
into 8 ohms or 70V/100V output
135MA
*1 kHz Power: refers to maximum power in watts at
1 kHz with 0.5% THD.
* 1 kHz
Power
60W
Minimum guaranteed power
into 8 ohms or 70V/100V output
160MA
*1 kHz Power: refers to maximum power in watts at
1 kHz with 0.5% THD.
*