Crown 135MA User manual

T
he Crown®135MA and 160MA are high-
value mixer-amplifiers 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 amplifier output. The 160MA
provides 4 inputs (each with a volume control)
and a 60W amplifier output.
Other features include priority muting, voice-
activated muting, phantom power, and Bass and
Treble controls.
Specifications
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, flashes
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 flashes brightly at
threshold of audible distortion.
Master Output Volume Control: Detented potenti-
ometer with knob.
Back Panel Controls, Connectors and
Indicators
Fuse: Protects the power supply.
AC Power Inlet: Detachable IEC accepts US or
Euro style power cords.
Amplifier 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 Configuration 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.
COMMERCIAL AUDIO SERIES
• 3 inputs (each with a volume control), and one
35W amplifier output channel in 135MA
• 4 inputs (each with a volume control), and one
60W amplifier 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 specifications
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.
*

Crown International
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: [phone]
FAX: [phone]FAX
www.crownaudio.com
12/07 140498-1
Specifications subject to change without prior notice. Latest
information available at www.crownaudio.com.
Crown and Crown Audio are registered trademarks of Crown
International. Other trademarks are the property of their
respective owners. Printed in U.S.A.
© 2007 Crown Audio®, Inc.
VOX Threshold: Trim pot controls how loud the
voice on CH1 must be before muting other chan-
nels. Can be set for no muting.
Cooling
Convection cooled.
Protection
Included protection mechanisms are current limit-
ing, over-temperature thermal cutout, and DC-fault
load protection. The unit is protected against
turn-on/turn-off thumps.
Included Accessories
Power cord
Non-touch cover for output connectors
Phoenix-type connectors
Spade lugs
Optional Accessories
Part no. IST 600-ohm Isolation Transformer for
Telephone Output or Input 1.
160MA back panel
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown mixer-ampli-
fier—an unsurpassed industry standard. With this unprecedented No-Fault protection, your new Crown
mixer-amplifier is warranted to meet or exceed original specifications for the first three years of owner-
ship. During this time, if your mixer-amplifier fails, or does not perform to original specifications, it will
be repaired or replaced at our expense. About the only things not covered by this warranty are those
losses normally covered by insurance and those caused by intentional abuse. And the coverage is
transferable, should you sell your mixer-amplifier.
See your authorized Crown dealer for full warranty disclosure and details. For customers outside of the
USA, please contact your authorized Crown distributor for warranty information or call 574-294-8200.
135MA
Part no. RM1 single rack mount kit for mounting a
single MA unit in a rack.
Part no. RM2 double rack mount kit for mounting
two MA units side-by-side in a rack.
Part no. S-Cover 10-pack of security knobs.
Dimensions
Width: Half rack width (9.5 in. or 24.1 cm).
Height (front panel): 3.5 in. (8.9 cm).
Height (including feet): 4.1 in. (10.5 cm).
Depth (front panel to back panel): 12.2 in. (31.0
cm).
Depth (front of knobs to back panel): 13.9 in. (35.2
cm).
Weight
Net Weight:
135MA: 8 lb 2 oz (3.7 kg).
160MA: 9 lb 7 oz (4.3 kg).
Shipping Weight:
135MA: 10 lb 16 oz (4.9 kg).
160MA: 12 lb 4 oz (5.6 kg).
160MA