Crown 135MA

The 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.

Features
  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 investment and guarantees its specifications

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, illuminates
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 potentiometer
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 terminal
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 channels
when DIP switch 3 is on.
Input Connector 2: Unbalanced line-level RCAtype
connectors.
Input Connector 3: Unbalanced line-level RCAtype
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 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 controls how loud the
voice on CH1 must be before muting other channels.
Can be set for no muting.
Cooling
Convection cooled.
Protection
Included protection mechanisms are current limiting,
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
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).