Cloud Electronics CV250 - Manual (Page 2)

CV AMPLIFIER USER GUIDE 1
Installation Installation Installation Installation
CV500, 800 & 1000 CV500, 800 & 1000 CV500, 800 & 1000 CV500, 800 & 1000
These amplifiers occupy three units of rack space (i.e. 5.25"/133mm). All three amplifiers feature front
entry forced air cooling which enables any number of amplifiers to be racked without the need for
special ventilation provided that a free flow of air is available at the rear of the rack housing.
All the CV range of amplifiers are designed for continuous operation at high power levels and will tolerate
a good deal of abuse. Output short circuits or mis-matched loads, can be tolerated without harm.
Input Connections Input Connections Input Connections Input Connections
Inputs to all the amplifiers are connected via XLR-3-31 type connectors. The input circuit is electronically
balanced and where possible, the balanced mode is preferable. If the input is used in the unbalanced
mode, pin 3 must be linked to pin (Ov). The input is then connected to pin 1 (ground) and pin 2 (hot).
When used in the balanced mode, pin 1 is ground, pin 2 is in-phase, pin 3 in non phase.
Input impedance is 20K ohms balanced, 10K ohms unbalanced.
Provided pin 3 is grounded in the unbalanced mode, the input sensitivity is 0dBu (775mV) for both
balanced and unbalanced modes.
Output Connections Output Connections Output Connections Output Connections
The output from all the CV amplifiers is connected via an XLR-3-32 type connector or binding posts. The
minimum recommended load is 4 ohms. The two output channels must never be connected in parallel.
XLR connections are pin 1 = 0v, pin 2 = phase (hot).
Mode of Operation Mode of Operation Mode of Operation Mode of Operation
All amplifiers have a 3 position mode switch on the rear panel, adjacent to the Channel B input socket.
Stereo Stereo Stereo Stereo
In the centre position marked "Stereo" the amplifier operates as two independent channels for typical
stereo operation.
Mono Mono Mono Mono
With the switch in the "Mono" position the channel A input is internally connected to drive both channels
of the amplifier. The front level controls remain in operation as normal and the limiters also work normally
on each channel. When the "Mono" mode is in use, the appropriate LED on the front panel illuminates,
and channel B input is disabled.
Bridge Bridge Bridge Bridge
With the switch in the "Bridge" position the load should be connected between the two "Hot" output
terminals (XLR pin 2 or Red binding posts). The amplifier then operates as a single channel unit with a
minimum load impedance of 8 Ω. Channel A input socket, limiter and level control are operative, with
channel B input circuits disabled. The "Bridge" LED on the front panel illuminates when the mode switch
is in this position.
Important. Important. Important. Important. In the bridge mode, the full output of the combined channels is available at the output
terminals and care must be taken to ensure that the loudspeakers are capable of handling the available
power.