Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410
TEL: 201.909.8700 FAX: 201.909.8744
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
S E R I E S
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).
MA
TM
540
Mixer / Amplifier
Specifications
MA
TM
540 Mixer / Amplifier
MA 540 mixer/amplifier
35 W per zone at less than 1% (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, 1 V RMS
mic :
2k Ohms, -54 dBu (1.4 mV, balanced)
line :
>50k Ohm, -18 dBu (100 mV, balanced)
XLR mic :
2k Ohm, -54 dBu (1.5 mV, balanced)
mic :
2k Ohm, -54 dBu (1.5 mV, unbalanced)
line :
>50 k Ohm, -18 dBu (100 mV, unbalanced)
RCA :
>50 k Ohm, -18 dBu (100 mV, unbalanced)
send :
1k Ohm, 2.21 dBu (1 Volt, unbalanced)
return :
10k Ohm, 2.21 dBu (1 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, 150 Ohm terminated)
low EQ :
±10 dB at 100 Hz
high EQ :
±10 dB at 10 Hz
ch. 1 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 1-4 : level, signal presence and clipping LED
internal, 120 V AC at 60 Hz
375 Watts all channel at full power
175 Watts all channel at 1/8 power
five-amp fuse
5.25" x 19" x 15" (13.3 cm x 48.3 cm x 38.1 cm)
34 pounds (15.4 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
frequency 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.
