Crown 135MA - Manual

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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

• B a l a n c e d P h o e n i x - t y p e m i c / l i n e i n p u t ,

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.

*