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Cloud Electronics CX-A450

4 channel low impedance amplifier. 4 x 50 watts at 4 ohms. Optional transformer to convert to 70 volt / 100 volt line.
List price Ex. VAT: £600.00


The Cloud Electronics CX-A450 4 channel amplifier exhibits low levels of noise and distortion, and utilises the highest quality components for outstanding sound quality and rugged durability.

Plug in VCA modules are available for applications where remote level control is required.

In its basic state, the Cloud CXA450 is suitable for low impedance music systems only, but individual channels can be converted to 70V or 100V by installing optional transformer modules. (See related products)

  • 4 channel, 4 x 50W
  • Optional modules for remote level control of any channel, VCA-5
  • Optional equaliser modules for Bose loudspeakers can be fitted to any channel
  • Optional 4 x 40W 70V/100V transformer module - fitted internally -CXL-4160
  • Optional external 40W 70V/100V line transformer module also available CXL-40T
  • Input routing operations simplify terminations when some channels share a signal
  • Comprehensive protection circuitry including dynamic clip protection
  • LED indicators for signal, clip and protect
  • Forced cooling vari-speed DC fan

Additional Information

Output Power (Normal Mode)

50 W/ch into 4 ohms (all chs driven) 

Output Power (Bridge Mode)

100 W nominal into 8 ohms

Frequency Response

 10 Hz – 20 kHz, +0/-0.5 dB

High Pass Filter

-3 dB @ 65 Hz, switchable per-channel




<0.02% typical, 1 kHz,  60 W into 4 ohms, one channel driven,  22 Hz – 22 kHz


 <-96 dB rel. rated output, unweighted, 22 Hz – 22 kHz


<-70 dB, rel. rated output into 4 ohms, 10 kHz

VCA module THD+N

<0.03%, 1 kHz, 22 Hz – 80 kHz BW



Type & connectors

 Electronically balanced, 3-pin 3.5 mm-pitch screw-terminal connectors


0 dBu (0.775 Vrms)

Input Impedance

10 kohms (balanced)



Output Connectors (lo-Z)

2-pin 5 mm-pitch screw-terminal connectors

Output Connectors (100/70 V)

Screw terminals

Power input

230 V ±5% (115 V ±5% available)

Mains protection

Replaceable fuse, T3.15A H 

Amplifier Protection 

VI limiting, DC offset, Thermal, Switch-on Delay & Dynamic Clipping Protection

Status Indicators

Signal present, Peak & Protection


Force Cooled, variable speed DC fan

Dimensions (W x H x D)

482.6 x 88 (2U) x 300 mm


7.15 kg

View FileWhy An Impedance Meter is Essential for Audio Installers    Size: (72.64 KB)
View FileCloud Electronics CX-A450 & A850 Datasheet    Size: (2.28 MB)
View FileCloud CX-A450, CX-A850 CX-A6 Brochure    Size: (1.01 MB)
View FileCloud General Brochure    Size: (4.53 MB)
Product video for Cloud Electronics CX-A450
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