Cloud Electronics CV250 User Manual

CV AMPLIFIER

User Guide

Cloud Electronics Limited

140 Staniforth Road, Sheffield, S9 3HF England

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web site http://www.cloud.co.uk

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CV AMPLIFIER USER GUIDE 1

Installation

Installation

InstallationInstallation

CV500, 800 & 1000

CV500, 800 & 1000

CV500, 800 & 1000CV500, 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 th at a free flow of air is available at the rear of the rack housing.

All the CV range of a mplifiers are de si gn ed f o r c on t inu ous operation at h igh power levels and wi l l to l er ate
a good deal of abuse. Output short circuits or mis-matched loads, can be tolerated without harm.

Input Connections

Input Connections

Input ConnectionsInput Connections

Inputs to all the amplifiers are con ne cte d via XLR-3-31 type connectors. The input cir cu it is electr onic all y
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 bal anced 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 ConnectionsOutput 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 OperationMode of Operation

All amplifiers have a 3 position mode switch on the rear panel, adjacent to the Channel B input socket.
Stereo

Stereo

StereoStereo
In the centre position marked "Stereo" the amplifier operates as two independent channels for typical
stereo operation.

Mono

Mono

MonoMono
With the switch in the "Mon o" po si ti on th e ch an nel A inp ut is in te rn al ly c on nec te d to driv e bo th 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

BridgeBridge
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. In the bridge mode, the full output of the combined channels is available at the output

Important.Important.
terminals and care m u st be taken to e nsure that the lou dsp eakers are ca pable of han dli ng t h e ava i lable
power.