Crest Audio MA 540 User manual

Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410
TEL: [phone] FAX: [phone]
www.crestaudio.com
*A4500018*
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
9/5/01
v.1.5
SERIES
Features Description
• Five input channels
• Four zones
• 35 Watt output per zone
• Two XLR low-Z mic inputs (balanced)
• Detachable input connector for low-Z mic and
high-Z line on each channel
• Signal LED indicator for each channel
• Channel level control
• Low and high active EQ on each channel
• Four zone assignment switching on each channel
• Front panel adjustable threshold and paging hold
on channels 1 and 2
• Four master output level controls with signal and
clipping LED indicators
• Detachable preamp output/power amp input
connector for each zone
• Each zone output provides a 4)hm direct output
and transformer isolated 8 Ohm, 25 and
70 Volt outputs
• Each zone has 600 Ohm line level balanced output
• 19" standard rack-mount package
• Three rack spaces
• Externally accessible main fuse
The Crest MA 540 is a five-channel mixing sys-
tem with assign-ment capability to four independ-
ent powered zones. Each channel offers low and
high equalization, channel level control, signal
presence LED, 48 Volt phantom power and zone
assignment switching. Channels one and two
offer low-Z (XLR) and detachable screw terminal
microphone inputs (high and low-Z) for paging
capability with channel s three through five offer-
ing dual (paralleled) RCA jacks and detachable
screw terminal inputs (high and low-Z) for use
with various music sources. Additionally, channels
on and two have recessed screwdriver controls
for back-ground music "ducking" threshold and
hold-time adjustments.
Each zone has a master level control, signal
presence and clipping LED indicator, and detach-
able screw terminal connections for preamp
out/power amp in and balanced line output. Each
zone power amp is rated at 35 W PMS and pro-
vides 4 Ohms (direct output), 8 Ohms, 25 V and
70 V (transformer isolated outputs).
MATM 540
Mixer / Amplifier
Specifications MATM 540 Mixer / Amplifier
MA 540 mixer/amplifier
35 W per zone at less than % (60 Hz to 20 kHz with all four channels operating)
speaker : 4 Ohms (direct), 8 Ohms, 25 V and 70 V (isolated)
line : 600 Ohms balanced, V RMS
mic : 2k Ohms, -54 dBu ( .4 mV, balanced)
line : >50k Ohm, - 8 dBu ( 00 mV, balanced)
XLR mic : 2k Ohm, -54 dBu ( .5 mV, balanced)
mic : 2k Ohm, -54 dBu ( .5 mV, unbalanced)
line : >50 k Ohm, - 8 dBu ( 00 mV, unbalanced)
RCA : >50 k Ohm, - 8 dBu ( 00 mV, unbalanced)
send : k Ohm, 2.2 dBu ( Volt, unbalanced)
return : 0k Ohm, 2.2 dBu ( Volt, unbalanced)
50 Hz to 20 kHz, +0/-2 dB (transformer)
residual : 90 dB below rated power (channel down, master full up)
line inputs : 90 dB below rated power (controls nominal, 2k Ohm terminated)
mic inputs : 82 dB below rated power (controls nominal, 50 Ohm terminated)
low EQ : ± 0 dB at 00 Hz
high EQ : ± 0 dB at 0 Hz
ch. and 2 : level, low EQ, high EQ, four assign switches, signal presence, LED muting
threshold and adjustable release time.
ch. 3-5 : level, low EQ, high EQ, four assign switches and signal presence LED
masters -4 : level, signal presence and clipping LED
internal, 20 V AC at 60 Hz
375 Watts all channel at full power
75 Watts all channel at /8 power
five-amp fuse
5.25" x 9" x 5" ( 3.3 cm x 48.3 cm x 38. cm)
34 pounds ( 5.4 kg)
power output
o u t p u t s
channel 1 and 2 inputs
channels 3-5 inputs
i n s e r t s
fre uency response
signal-to-noise ratio
tone controls
c o n t r o l s
power supply
dimensions (H x W x D)
net weight
Architects’ & Engineers’ Specifications:
The mixer amplifier shall have five input channels each with
assignment capability to four independent powered zones.
Each channel shall contain low and high frequency equal-
ization, a level control, 48 Volt hantom power, signal pres-
ence LED and zone assignment switches.
Channels one and two shall be configured for paging with
balanced low-Z XLR and detachable screw terminal block
inputs (high and low-Z). These channels shall also have
front panel recessed screw driver controls for background
music “ducking”threshold and hold time adjustments.
Channels three through five shall be configured for use as
background music feeds with dual (paralleled) RCA jacks
and detachable screw terminal inputs (high and low-Z). All
five channels, however, are capable of being used with mic
or line level sources.
Each zone shall have a master level control, signal presence
and clipping LED indicators, and detachable screw terminal
connections for preamp output/power amp input and bal-
anced line output. Each zone power amplifier shall be rated
at 35 W RMS continuous and shall provide a 4 Ohm direct
output and transformer isolated 8 Ohm, 25 V and 70 V out-
puts. The unit shall be packaged in a rugged metal chassis
5 1/4”high, 19”wide and 15”deep, and shall weigh 34
pounds. The unit shall be rack mountable and will fit in a
standard 19”rack requiring three rack spaces. The unit shall
operate from 120 V AC 60 Hz power and consume no more
than 375 Watts. The unit shall meet or exceed all the pub-
lished specifications.

Specifications MATM 540 Mixer / Amplifier Specifications MATM 540 Mixer / Amplifier
TOP
FRONT
SIDE
43.2 cm
19.00"
13.3 cm
5.25"
13.3 cm
15.00"
MA 540 Dimensions
MA 540 Block Diagram
Mic Input
Mic Preamp Level Two Band EQ
XLR
Assignment
Switches
CHANNEL ONE
Mic Input
XLR Two Band EQLevel
Mic Preamp
Assignment
Switches
CHANNEL TWO
Assignment
Switches
Two Band EQ
Level
Mic Preamp
RCA
CHANNEL THREE THRU FIVE
Clip LED ZONE ONE
Effects Loop
Signal LED
Power AMP
35 Watts RMS
Link Switch
Clip LED ZONE TWO
Outputs
Outputs
X-Former
Effects Loop
Signal LED
Power AMP
35 Watts RMS Outputs
Output
X-Former
Link Switch
Clip LED
Effects Loop
Signal LED
Power AMP
35 Watts RMS
Output
X-Former
Link Switch
ZONE THREE
Clip LED ZONE FOUR
Signal LED
Link Switch
Power AMP
35 Watts RMS
Output
X-Former
Effects Loop
MA 540 Distortion at 35 Watts
MA 540 Fre uency Response
Hz
%
Hz
dBr