Audio & Design (Recording) Ltd

Audio & Design (Recording) Ltd are an English based company who specialised in the development and production of professional audio processors, in the form of limiters, compressors, expanders & equalisers. The company were one of the first to introduce Field-effect transistors into a commercially available limiter amplifier in 1966. [Page 1, Audio & Design (Recording) Ltd Level Control Equipment book 1975] Audio & Design (Recording) equipment has been widely used by professional studios, music artists and the broadcasting industry throughout the world. [Page 1, Audio & Design (Recording) Ltd Level Control Equipment book 1975] Recently the company has installed and serviced the BBC World Service's multi Terabyte archive installation using Storage area network technology (SAN). [ [http://www.proaudio.uk.com Official Company Website]

Notable Products

F760X-RS 'Compex' Limiter

The F760X 'Compex' limiter was made up of three main parts; a compressor, limiter and a 'noise reducing' expander/gate. All of these parts could be used separately or together for well controlled sound limiting. This combination came about from client feedback. From the feedback ADR designed and built the first units, these were labelled as F760X-RS (RS meaning rackmount stereo). Later modifications were made and another version was released with a better, ergonomically designed, front panel. This later model was labelled as the 'Compex'. [ADR F760X-RS Operation Manual] The 'Compex' limiter provided peak limiting with a multi-ratio, variable threshold compressor. Ratio settings ranged from 1:1 to 20:1 and there were controls for threshold and release time. The inclusion of an expander/gate provided attenuation of the gain during pauses in the audio signal to reduce noise caused by compression; the expander/gate could also be used for special 'punchy' effects, favoured on drum and percussive sounds. Noise gates were often criticised at the time for 'hunting' around the threshold point. The 'Compex' used clever hysteresis around the gate, this was important to stop unpredictable opening and closing of the gate; the open threshold was higher than the close threshold. [ADR F760X-RS Operation Manual] The gain reduction controlled by the 'Compex' was monitored from two meters located to the right of the front panel. There were two light indicators; a red light lit when the signal level reached its peak, and when in expand mode a green light was lit. There were a set of lights for each channel, depending if the unit was the stereo or mono version.There were some different models of the 'Compex' available; one of these included a smaller console module named the F760-N. This version was built without the expander/gate, it later had an expander/gate added and was then known as the F760X-N. ADR also built an F760 version for the Helios mixing consoles. [ADR F760X-RS Operation Manual]

camp Rack

Scamp stood for (Standardised Compatible Audio Modular Package). The system embodied the card-module concept within a standard racking frame. Although employing no specifically new techniques the design offered dramatic savings in packaging costs without degradation in performance standard. The rack was designed to be configured to different types of recording sessions using different types of modules. The rack could hold seventeen one inch modules all powered from the rack itself by use of an external power supply. [Audio & Design (Recording) Ltd, Scamp brochure and book 1981]
Below is a list of the modules that were available.

* ADT Analog Flanger & Delay
* F300 Expander Gates
* S01 Compressor Limiter
* S02 Microphone Pre Amplifier
* S03 Sweep Equaliser
* S04 Parametric Equaliser
* S05 Dynamic Filter/Gate
* S06 Dynamic Filter/Gate
* S07 Octave Equaliser
* S08 DA 2in / 8out
* S12 Bantam patchbay
* S14 LED Quad Meter
* S23 Pan effects module
* S24 Time Shape Module
* S25 Dual De-esser
* S26 Mini Rack Power Supply
* S30 Expander
* S31 Compressor
* S100 Dual gate

External Links

* [http://www.proaudio.uk.com Official Company Website]

References