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COMMERCIAL AUDIO
C
rown’s Commercial Audio mixer/amplifiers deliver legendary Crown quality to the commercial audio
industry. These high-value mixer-amplifiers provide both 8-ohm and constant-voltage outputs (70V
and 100V) for use in a wide range of commercial applications including schools, hospitals, factories,
restaurant/retail, houses of worship, fitness facilities, A/V boardrooms, correctional facilities, and small
offices. Easily configured for a range of uses such as paging, background music, security, and evacua-
tion instructions, Crown’s Commercial Audio units are the smart choice for commercial sound.
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, 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
potentiometer with knob.
Back Panel Controls, Connectors and
Indicators
AC Power Inlet: Detachable IEC accepts US or
Euro style power cords.
Amplifier Output Connector: 4-position termi-
nal 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 ampli-
fiers. Level independent of master volume
control.
Input Connector 1: 5-terminal Phoenix connec-
tor. 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 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
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 sens-
ing 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 mount-
ing a single MA unit in a rack.
Part no. RM2 double rack mount kit for mount-
ing 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).
Regulatory Certifications
2/08 140498-1