Crown 135MA - User Manual

T
he Crown
®
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.
COMMERCIAL AUDIO SERIES
• 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.
*

Summary

Product Specifications and Features

Performance Specifications

Details frequency response, signal-to-noise ratio, THD+N, input sensitivity, impedance, crosstalk, and output levels.

AC Line Voltages and Environmental Conditions

Specifies available AC line voltages, tolerance, operating temperature, humidity, and storage temperature.

Key Product Features

Highlights core functionalities including input counts, amplifier output, priority muting, and warranty.

Front Panel Controls and Indicators

Front Panel Controls and Indicators

Details power switch, input volume, tone controls, and various signal presence/clip indicators.

Back Panel Features and Connectivity

Back Panel Controls and Connectors

Describes amplifier output, preamp output, telephone output, and input connectors.

Amplifier Configuration and VOX Threshold

Explains DIP switch settings and the VOX threshold trim pot for channel muting.

Unit Protection and Cooling

Details protection mechanisms like current limiting and thermal cutout, and notes convection cooling.

Included and Optional Accessories

Lists standard accessories like power cords and optional items for rack mounting and isolation.

Dimensions and Weight

Provides physical dimensions in inches and cm, and net/shipping weights in lbs/kg.

Three-Year No-Fault Warranty

Crowns Three-Year, No-Fault, Fully Transferable Warranty

Outlines the comprehensive warranty covering repair or replacement for three years against defects.

Overview

1. Performance Specifications
2. Environmental Specifications
3. Front Panel Controls and Indicators
4. Back Panel Controls, Connectors and Indicators
5. Cooling
6. Protection
7. Included Accessories
8. Optional Accessories
9. Dimensions
10. Weight
11. Maintenance and Warranty

The Crown 135MA and 160MA are high-value mixer-amplifiers designed for commercial audio applications, offering both 8-ohm and constant-voltage outputs (70V and 100V). These units are ideal for paging, background music, and music-on-hold systems.

The 135MA model features three inputs, each with its own volume control, and a 35W amplifier output. The 160MA model expands on this with four inputs, each with a volume control, and a more powerful 60W amplifier output. Both models include essential features such as priority muting, voice-activated muting (VOX), phantom power, and Bass and Treble controls for master output.

Performance Specifications:

• 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.
• 135MA Minimum guaranteed power: 35W into 8 ohms or 70V/100V output (at 1 kHz with 0.5% THD).
• 160MA Minimum guaranteed power: 60W into 8 ohms or 70V/100V output (at 1 kHz with 0.5% THD).

Environmental Specifications:

• AC Line Voltages Available: Universal Power Supply with a line voltage tolerance of +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 detented potentiometers with knobs, one for each input.
• Tone Controls: Non-detented recessed potentiometers for Bass (±10 dB at 100 Hz) and Treble (±10 dB at 10 kHz) adjustments, located under the master output volume control.
• Power Indicator: Blue LED indicating power on.
• Input Signal Presence Indicators: Green LED, one above each channel's input attenuator, illuminates when input signal exceeds -40 dBu.
• Input Signal Clip Indicators: Green LED, one above each channel's input attenuator, flashes brightly at the 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 the threshold of audible distortion.
• Master Output Volume Control: Detented potentiometer with knob.

Back Panel Controls, Connectors and Indicators:

• AC Power Inlet: Detachable IEC connector for 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 terminal forks. Includes a non-touch cover.
• Preamp Line Out Connector: 3-pin balanced Phoenix-type connector for external amplifiers. Level is independent of master volume control.
• Input Connector 1: 5-terminal Phoenix connector for balanced signal and priority contact closure (mutes other channels when DIP switch 3 is on).
• Input Connector 2, 3, and 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 to adjust level for Music-On-Hold output from Telephone (MOH) Output Connector.
• Amp Configuration DIP Switch: DIP switch selection 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.
• VOX Threshold: Trim pot to control the voice level on CH1 required to mute other channels. Can be set for no muting.

Cooling:

• Convection cooled.

Protection:

• The units include current limiting, over-temperature thermal cutout, and DC-fault load protection. They are also protected against turn-on/turn-off thumps.

Included Accessories:

• Power cord
• Non-touch cover for output connectors
• Phoenix-type connectors

Optional Accessories:

• Part no. IST 600-ohm Isolation Transformer for Telephone Output or Input 1.
• 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).

Maintenance and Warranty:

Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown mixer-amplifier. This warranty ensures that the mixer-amplifier will meet or exceed original specifications for three years of ownership. If the unit fails or does not perform to specifications during this period, it will be repaired or replaced at Crown's expense. The warranty covers manufacturing defects and performance issues, excluding losses covered by insurance or those caused by intentional abuse. The coverage is transferable if the mixer-amplifier is sold. For full warranty disclosure and details, customers should consult their authorized Crown dealer. For customers outside the USA, contact an authorized Crown distributor or call 574-294-8200.

Crown 135MA Specifications

General

Brand	Crown
Model	135MA
Category	Amplifier
Language	English