Crown 135MA Architectural & Engineering Specifications

135MA

COMMERCIAL AUDIO SERIES

Architectural & Engineering Specifi cations

135MA

The Crown® 135MA shall be a mixer-amplifi er for commercial and
industrial audio. It provides 8-ohm and constant-voltage outputs (70V and
100V).

The 135MA has 3 inputs and one 35W power amplifi er.

Specifi cations

The 135MA shall have the following specifi cations:
Minimum guaranteed power into 8 ohms or 70V/100V output: 35W maxi-

mum power at 1 kHz with 0.5% THD; Frequency Response (at 1 watt from
line out): 50 Hz to 20 kHz ± 1 dB, 19 Hz - 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: > 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 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

Front panel controls and indicators shall include the following:
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.

Rear Panel Controls and Connectors

Rear panel controls and connectors shall include the following:
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 RCA-type connectors; Input Connector
3: Unbalanced line-level RCA-type connectors; Telephone (MOH) Output
Connector: 4-terminal Phoenix connector (2 terminals for 1W output to 8­ohm 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; VOX Threshold: Trim pot controls
how loud the voice on CH1 must be before muting other channels, can be
set for no muting.

Miscellaneous

Cooling shall be by convection. Included protection mechanisms shall
be current limiting, over-temperature thermal cutout, and DC-fault load
protection. The unit shall be protected against turn-on/turn-off thumps.

Included accessories shall be a power cord, non-touch cover for output
connectors, and Phoenix-type connectors. Optional accessories shall be
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.

The dimensions of the mixer-amplifi er shall be as follows:
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).

The mixer-amplifi er shall weigh 8 lb 2 oz (3.7 kg).
The mixer-amplifi er shall be designated the Crown 135MA.

Crown International
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: [phone]
FAX: [phone]FAX
www.crownaudio.com

Specifi cations subject to change without prior notice. Latest
information available at www.crownaudio.com.
Crown and Crown Audio are registered trademarks of
Crown International.
Printed in U.S.A.

© 2008 Crown Audio

®

, Inc. 2/08 140614-1