Quick Start Guide
12 CPA Series Quick Start Guide 13
CPA Series Getting Started
Welcome to the CPA series Quick Start Guide
and thank you for purchasing one of these mixer
ampliers. The following accessories are included
with your product:
- Euroblock input connectors
- Euroblock output and aux output connectors
- Front angle bracket (x2)
- Rear at brackets (x2)
- Rear angle bracket with shoulder screw
- Necessary screws and Torx L-key
- Power cable with mains plug corresponding to the
specied country version
- Quick Start Guide (this document)
Rack Mounting
The CPA series ampliers come with rubber feet
that enable the amps to be placed on a clear surface
without any additional installation. However,
optional rack mounting hardware is also supplied,
allowing several models to be housed and protected
inside a 19" rack enclosure. Follow these steps to
attach the mounting hardware.
Attach the front angle brackets to either side of
a CPA unit.
Attach the angled brackets by unscrewing the
chassis side front screws and attach again together
with the brackets.
If your rack has rear rails, attach the rear at brackets
by reusing the screws from the chassis.
Mount the CPA unit(s) into the rack by attaching 4
rack screws through the front angle brackets and
rack rails.
Hold one of the rear angle brackets up to the rear
rack rails so that it lines up next to the rear at
bracket. Do not attach it to the rear rails yet.
Insert the included shoulder screw through the slot
in the rear at bracket and into one of the threaded
holes in the rear angle bracket. The screw should
allow the rear angle bracket to slide forward and
back within the at bracket’s slot.
Repeat the process for the other rear angle bracket.
Mount the rear angle brackets to the rear rack rails
using 4 standard rack screws.
Tighten the shoulder screw if necessary.
Standard rack screw: M4 x 8 mm.
The CPA series ampliers are convection cooled and
primarily use the top surface to dissipate heat. For
demanding applications, it is recommended to have
sucient space (1 RU) above the amplier to reduce
the risk of limiting due to overheating.
Connections
For balanced or microphone input connections, use a
3-pole cable (hot, cold, ground) wired to a Euroblock
connector. Place the Mic/Line switch next to the
input at the appropriate position to optimize input
gain. Alternatively, RCA cables can be connected for
unbalanced stereo sources, but the RCA and
Euroblock inputs should not be used together on the
same input. Note that stereo signals will be summed
to mono.
Always be sure to have all levels at minimum when
connecting or disconnecting audio sources from
the inputs, especially when MIC is selected from
the MIC/LINE switch. Failure to do so may cause the
amplier or speaker to go into a protection mode or
even cause damage.
For output signals, connect a 4-pole Euroblock
connector (2-pole for CPA1201/2401) to the main
output connector(s). Do NOT connect any terminal to
ground. Do NOT connect the cold (-) terminals
together for common returns. Make sure to set the
Cong switches in the correct position to match your
intended use. Speaker wire of 14-18 AWG is
recommended for connections up to 50 feet.
Rear angle bracket
Front angle bracket
Rear at bracket
3-Pin Euroblock Connector - Input / Output
1
2
3
1. hot (+)
2. cold (-)
3. ground/shield
1
2
3
4
1. Out A - hot (+)
2. Out A - cold (-)
3. Out B - hot (+)
4. Out B - cold (-)
Cong
The rst 2 Cong dipswitches allow the output to
be congured for 100 V, 70 V, 8 , or 4 operation.
Always use the correct conguration for the speakers
being driven! The mode of operation congures both
the maximum voltage of the output and the gain
through the device.
The 8 setting should be used for a pair of 16
speakers or a single 8 speaker. The 4 setting
should be used for 4 x 16 , 2 x 8 , or a single 4
speaker. Use 70 or 100 V setting for Constant Voltage
high impedance speaker systems. Make sure the sum
of the power tapping on the speakers plus margin
does not exceed the amplier's maximum power
rating.
The 3rd dipswitch engages a high-pass lter at 80
Hz, which should be used on all Constant Voltage
systems to avoid saturation on the transformer-
enabled speakers, but can also be used to help
maintain clear sound from small speakers or bass-
heavy audio.
Input Routing
For CPA1202/2402 units, the routing of inputs to
outputs can be controlled with the input routing
dipswitches. By default (switches down), Inputs A-D
are routed to Output A and Inputs E-H are routed to
Output B. However, for sources that should be sent
to both outputs, the corresponding dipswitch can
be engaged to route an input to the other output
channel as well. This is useful, for example, to send
background music or paging messages to both
zones/sections of a building but maintain other
sources local to each zone.
Phantom power (48 V) can also be supplied to
channels A-D and E-H independently by engaging
the corresponding dipswitch.
Engaging the CHIME function will trigger a chime
sound each time the priority muting is activated.
Priority and Vox
Inputs A and B (Input A only on CPA1201/2401) have
the ability to mute all other channels when the
Priority function is activated. Activation is achieved
by shorting the 2 Priority pins with a closure
switch, often found on paging mics. Alternatively,
the activation can also be done by the signal on the
prioritized input exceeding a set level (threshold).
Turning the VOX knob counterclockwise sets the
input level required to engage ducking. Set it so
that speaking clearly into the mic exceeds this
threshold, but ambient noise is ignored. Turning the
VOX knob fully clockwise (OFF) disables this feature.
For CPA1202/2402, the ducking aects all other
sources that are routed to the same output as the
prioritized input. For example, if Input A is routed
also to Output B, Input A will have priority over all
other inputs. Input E, however, cannot have priority
over the Output A inputs.
Remote
RJ45 receptacle to connect an optional remote
volume control per channel. Use a standard cable to
connect the CRC-V accessory, or connect a custom
potentiometer with the pinout information. Cable
length above 305 m (1000 ft) is not recommended.
Signal Wake-up
If the amps are powered on, but do not receive
any input signal (below signal present level) for 20
minutes, the system will enter standby mode to save
power consumption. As soon as a signal is detected
at any input, the unit will exit standby mode and
resume normal function. The system can also be
waken up by shorting the priority pins.
5-Pin Euroblock Connector - Remote
1
2
3
4
5
1. priority
2. priority
3. hot (+)
4. cold (-)
5. ground/shield
RJ-45 Pin
Color
(T568B)
Remote
(1 channel
products )
Remote
A+B
Remote B
1
White/
Orange
VCC
10 V
VCC
10 V
VCC
10 V
2
Orange
Volume
Control
Volume
Control
Channel
A
Volume
Control
Channel
B
3
White/
Green
N/A
Volume
Control
Channel
B
N/A
8
Brown Ground Ground Ground