User guide

VTX Series User Manual v1.0 5
General Description
Cloud VTX ampliers are a range of high power multi-
channel audio ampliers intended for use with high quality
PA and music systems in locations where unquestionable
long-term reliability is the primary consideration. As well as
theatres, leisure centres and other major venues, they are
also ideal for airport terminals, railways stations and similar
large public spaces.
VTX ampliers deliver excellent audio quality at all rated
powers and have all the facilities and features that installers
have come to expect from Cloud products. The VTX range
are the rst Cloud products to offer a plug-in surveillance
card option, permitting the operating parameters and
settings of all networked ampliers to be monitored
anywhere, using any computer’s standard web browser.
Applicable Models:
This manual describes the installation and operation of the
following models:
• Cloud VTX4120 4-channel amplier
– 4 x 120 W into 4 ohms
• Cloud VTX4240 4-channel amplier
– 4 x 240 W into 4 ohms
• Cloud VTX4400 4-channel amplier
– 4 x 400 W into 4 ohms
All models are 2U, 19” rack-mounting units. Apart from
the output power rating, the three models are identical for
the practical purposes of installation and operation. Unless
specically stated otherwise, the information in this manual
may be taken to apply to all models.
VTX range main features:
• High power multichannel ampliers for “install-and-
forget” applications
• 120 W, 240 W or 400 W per channel into 4 ohms
(model-dependent)
• Extensive protection against short-circuit and reactive
loads, clipping, DC and overheating
• Chs1 & 2 and/or 3 & 4 may be operated in Bridge Mode
• Per-channel, front-panel LEDs for power status, signal
presence, peak level and protection
• Balanced line level inputs with gain trim
• Congurable for 4 channel, dual stereo or mono use
• Per-channel switched hi-pass lter
(18 dB/oct below 65 Hz)
• Optional VTX-WM1 card allows amplier monitoring
from a standard web browser
• Optional remote volume control (per-channel)
• Optional Bose® EQ cards (per-channel)
• 2U 19” rackmounting unit
• Forced-air cooling
• Five year warranty
Block Diagram
g.1: VTX Series Block Diagram