Sonifex Develop Amplifier for Emergency Audio System
29th November 2013
Sonifex have a number of audio distribution products in their Redbox audio range. Recently they were asked to develop a new amplifier for a particular application - the RB-DA24MD is a 24 way audio distribution amplifier, with 2 inputs which can be individually routed to 12 outputs or mixed and routed to all 24 outputs. The inputs can be configured as either dual mono, input 1 routed to outputs 1-12 and input 2 routed to outputs 13-24, or mixed-mono, inputs 1 and 2 mixed at a pre-set level and routed to all 24 outputs.
Richard Butlin, Sonifex Sales Manager, said: "We designed this product for a niche application of distributing a mono or stereo audio feed to multiple active speakers for an emergency audio distribution system. The customer has a number of office desk clusters, each with a small speaker mounted underneath them, so that in the event of an emergency, everyone in the building gets a clear emergency signal. Because the RB-DA24MD has so many outputs, they can cover 100 desks with only 5 units.”
The XLR inputs and D-type outputs are electronically balanced and can be wired unbalanced. Each output is individually buffered so that a short circuit on one won’t affect the others. Each output is also protected against connection to both POE (power over Ethernet) and phantom power circuits.
The RB-DA24MD has master gain controls for both input 1 and input 2 which are pre-set potentiometers accessible through the rear panel. These controls allow the gain to be adjusted from -15dB to +15dB, useful for normalising consumer to professional signals and vice versa. An LED power indicator on the front panel shows that the unit is powered. Also a 125Hz 6dB per octave roll off filter can be switched in.