Rotary step attenuator meets high-end audio applications

03 September 2014

Available from a dedicated rotary switch web shop, the Elma A47 audio attenuator is the first PCB-based audio switch from Elma Electronics.

Set up by Foremost Electronics, the Essex based distributor of specialised electromechanical components, Rotary Switches Online stocks a range of rotary switches and potentiometers, contemporary and vintage control knobs and accessories.

The A47 rotary step attenuator incorporates a PCB based switch contact system and has been designed specifically to provide volume control for audio equipment and is claimed to offer ‘outstanding’ sonic performance and precise tactile feel when operated. These low-profile switches provide 47 positions that improve accuracy with selectable end-stops from one to eight channels.

It has Elma’s indexing feel for superior tactile feedback and a low-bounce contact system with 3µm gold plating. Switching torques are 4- and 8Ncm as standard and are populated with low-noise, high precision SMT resistors offering standard input impedances of 10k, 25k, 50k, 100k or 600k.

Two, non-populated THT versions can be custom populated by the user. The standard version is for 0.125 to 0.5W resistors, and the jumbo PCB version is for those that prefer the sound quality of larger wattage resistors. A free Excel-based resistor calculator tool is downloadable from the Elma website.

An optional motorised, remote control kit with a motor drive is available as an accessory. A selector switch variant will be added later this year. These audio switches are for mixing desks and outboard studio equipment as well as for high-end home audio and theatre configurations.

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