The Cloud 24 Series is a two zone mixer-amplifier intended to provide a complete audio solution for Houses of Worship, retail outlets, hotels, licensed premises and other spaces where music, announcements and/or flexible paging are required. Catering for up to four music sources, it provides independent source and level control of music in each zone with microphone mixing as required, with full paging facilities. Each zone includes a mono power amplifier and the unit occupies only 1U of rack height. There are two models in the 24 Series, with different output power ratings: 24-120: 2 x 120 watts 24-240: 2 x 240 watts Cloud 24 Series mixer-amplifiers have four stereo line inputs for music sources, two unbalanced and two balanced, plus a balanced microphone input. The microphone input has its own rear panel sensitivity and EQ controls; the front panel has a mic gain control for each zone. Each line input has a rear panel sensitivity control; the required music source and music level in each zone being adjusted by front panel rotary controls. In each zone, the selected music source is mixed with the mic signal before being fed to the power amplifier stage. The front panel also provides a PEAK LED for each zone to warn of excessive signal level; further LEDs indicate power status and Music Mute activity (see below). The power status LED is bi-colour and also indicates various fault states. The 24 Series is compatible with the Cloud PM1 single-zone paging microphone, and may also be used for two of the zones supported by the Cloud PM4/8/12/16/4-SA/8-SA multizone paging microphones. Alternatively, the mic input may be configured to suit most OEM paging systems; paging is activated by a per-zone short-to-ground access connection. An internally-generated pre-announcement chime may also be enabled at installation. The mic input may be selected to have automatic priority over the selected music source, and additionally Line Input 4 may be set to have priority over any other input selected, to facilitate connection of a digital sound store or similar device.
The power output stages are entirely independent for each zone. They are transformerless, and are capable of driving 70/100 V-line loudspeaker distribution systems directly. Rear panel DIP switches allow the output voltage and impedance for each zone to be selected, permitting the amplifier to be used to either drive low impedance (4 or 8 ohm) loudspeakers or 70/100 V-line systems. Additionally, Model 24-120 utilises the “power sharing” concept introduced in Cloud’s CV Series amplifiers: in high–impedance mode (70/100 V-line operation) the maximum power output of 240 W (2 x 120 W nominal) may be shared unequally between the two zone outputs, allowing the amplifier’s power capability to be shared between zones of significantly different sizes more efficiently. In addition to the main Zone outputs, 24 Series mixer-amplifiers also have a balanced Utility output, which carries its own mix of mic and music signals, set with rear panel controls. This is ideal for driving a hearing loop amplifier. The music source at this output can be configured (by internal jumper) to follow that currently selected for Zone 1, or to be Line Input 1 at all times. There are two further Auxiliary outputs, taken from the input to the power stages of Zones 1 and 2: these are balanced at line level (0 dBu) and may be used to connect additional, external power amplifiers or for any other purpose. A particularly useful feature of the 24 Series is the Facility Port; this allows a remote input module from the Cloud LM-2 Series (for wired sources) or BT-1 Series (for Bluetooth wireless sources) to be connected via easy-to-install screened Cat 5 cable. Microphones, and/or line sources such as radio mics, DJ mixers, MP3 players, laptops or other audio sources - including Bluetooth-equipped laptops, tablets and smartphones - can then be connected at remote locations, simplifying the use of the area for presentations where portable audio sources are in use. By default, the Facility Port routes audio only to Zone 1, but an alternative routing option of ‘both zones’ is available by moving an internal jumper. The Facility Port is equipped with a fixed threshold noise gate to eliminate background noise in the absence of an input signal. Note that LM-2 modules also provide remote control of music level and music source selection.
Cloud Electronics 24-120 Features
• Two zone mixer/amplifier
• 2 x transformer-less Class-D 120W amplifiers with limiters on each zone plus Thermal/Short Protection
• High-Impedance Power sharing (24-120 only)
• 4 Line inputs, 2x unbalanced/ 2x balanced
• 1 Mic input with analogue paging options
• Integrated chime triggered by access control
• 100Hz dedicated high-pass filter on Microphone input
• Phantom power selectable by internal jumper
• Music level and source selection via RSL-4 & RSL-6
• Facility input (Zone 1 or Both) for active modules LM-2/BT-1
• RS232 control interface
• Line 4 priority
• Mic over Music input priority
• Separate EQ for music and mic signals
• 2 x Auxiliary balanced line outputs
• 1 x Utility / Loop output with independent line & mic controls with music content selection
• Remote Music Mute configurable for NO or NC operation
• Selectable speaker output impedance (4Ω/8Ω/70v/100v)
• Efficient, Universal Power Supply
• Variable Speed Fan Cooling
