this article has multiple issues . please help improve it or discuss these issues on the talk page . learn how and when to remove these template messages the topic of this article may not meet wikipedia s notability guidelines for companies and organizations . please help to establish notability by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond its mere trivial mention . if notability can not be established the article is likely to be merged redirected or deleted . find sources audio & design recording ltd news newspapers books scholar jstor free images september 2012 learn how and when to remove this template message this article relies too much on references to primary sources . please improve this by adding secondary or tertiary sources . september 2012 learn how and when to remove this template message this article needs additional citations for verification . please help improve this article by adding citations to reliable sources . unsourced material may be challenged and removed . september 2012 learn how and when to remove this template message learn how and when to remove this template message audio & design recording ltd industry electronics broadcast it headquarters reading berkshire key people ian harley products audio & broadcast equipment website http www.adrl.co.uk 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 . 1 audio & design recording equipment has been widely used by professional studios music artists and the broadcasting industry throughout the world . 1 recently the company has installed and serviced the bbc world service s multi terabyte archive installation using storage area network technology san . 2 contents 1 notable products 1.1 f760x rs compex limiter 1.2 scamp rack 2 external links 3 footnotes notable products edit f760x rs compex limiter edit 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 rack mount 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 . 3 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 . 3 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. there is also a rare version called f760x rs t. one of the visible differences are the vu meters which got the brand audio & design recording ltd. and if you look on the rear there you can see the type . the t stands for transformer which are said to add harmonics to the sound.the t version was mainly used in broadcasting stations mainly because of its snr and headroom . adr also built an f760 version for the helios mixing consoles . 3 scamp rack edit 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 . a half width rack with integrated power supply which could hold six modules was also available . 4 below is a list of the modules that were available . f300 expander gates s01 compressor limiter fet based s02 microphone pre amplifier s03 sweep equaliser s04 parametric equaliser s05 dynamic filter gate s06 dynamic filter gate s07 octave equaliser s08 distribution amplifier 2in 8out s12 bantam patch bay s14 led quad meter s23 pan effects module s24 time shape module analog adt flanger & delay s25 dual de esser s26 mini rack power supply s30 expander s31 compressor limiter vca based s100 dual gate external links edit official company website footnotes edit a b page 1 audio & design recording ltd level control equipment book 1975 official company website a b c adr f760x rs operation manual audio & design recording ltd scamp brochure and book 1981 retrieved from https en.wikipedia.org w index.php title audio % 26 design recording ltd & oldid 647092326 categories music equipment manufacturershidden categories articles with topics of unclear notability from september 2012all articles with topics of unclear notabilityarticles lacking reliable references from september 2012all articles lacking reliable referencesarticles needing additional references from september 2012all articles needing additional references navigation menu personal tools not logged intalkcontributionscreate accountlog in namespaces article talk variants views read edit view history more search navigation main pagecontentsfeatured contentcurrent eventsrandom articledonate to wikipediawikipedia store interaction helpabout wikipediacommunity portalrecent changescontact page tools what links hererelated changesupload filespecial pagespermanent linkpage informationwikidata itemcite this page print export create a bookdownload as pdfprintable version languages add links this page was last modified on 14 february 2015 at 12 30 . text is available under the creative commons attribution sharealike license ; 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