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((Short description|Modular monophonic analog synthesizer))
((more citations needed|date=December 2015))
((Infobox synthesizer
| image = ARP_2500.jpg
| image_caption = ARP 2500
| synth_name =  2500
| synth_manufacturer = [[ARP Instruments, Inc.]]
| synthesis_type = [[Analog signal|Analog]] [[Subtractive synthesis|Subtractive]]
| polyphony = [[Duophonic]]
| timbrality = [[Monotimbral]]
| oscillator = ((ubl|1004p|1004r|1004t|1023))
| filter = 
| attenuator = 
| left_control = 
| lfo = 
| keyboard = ((ubl|3002 Two voice, 5 octaves|3222 Four voice, split, 5 octaves|3604 One voice, portable, 4 octaves))
| memory = none
| ext_control = 
| fx = none
| dates = 1970–1981
| price = US$7180 - US$19920
))

The '''ARP 2500''' is a [[monophonic (synthesizers)|monophonic]] analog [[modular synthesizer]]. It was the first product of [[ARP Instruments, Inc.]], built from 1970 to 1981. 

It is equipped with a set of sliding matrix switches above each module; these switches are the primary method of interconnecting modules.

==Features==
[[File:Arp2500.jpg|thumb|left|Arp 2500]]
There are rows of 1/8" ''[[TRS connector|miniphone]]'' jacks at the end of each row of matrix switches,<ref name=Sequencer.de>((cite web | title = ARP 2500 image at Sequencer.de  | url = http://www.sequencer.de/pix/arp/arp2500.jpg))</ref> to interconnect rows of switches. The main 2500 cabinet can hold 15 modules, and optional wing cabinets can each hold 8. The matrix switch interconnection scheme allow any module's output to connect to any other module's input.  Unlike the patch cords of competitive units from [[Moog synthesizer|Moog]] and [[Buchla]], which can obscure control knobs and associated markings, the matrix implementation enables a cable-free experience but at the price of greater cross-talk.<ref name=Mark_Jenkins>((cite book |title=Analog Synthesizers: Understanding, Performing, Buying- from the legacy of Moog to software synthesis |last=Jenkins |first=Mark |year=2007 |publisher=Focal Press |isbn=978-0-240-52072-8 |page=60))</ref>

Although the 2500 proved to be a reliable and user-friendly machine, it was not commercially successful, selling approximately 100 units.<ref name=Reverb>((cite web | title = A Tribute to the ARP 2500, the Close Encounters Synth | date = 22 August 2017| url = https://reverb.com/news/a-brief-history-of-the-arp-2500))</ref> A collection of the 2500's most popular modules was packaged into a single, non-modular unit as the [[ARP 2600]], leaving out the matrix switching and more esoteric functions.

==Notable users and appearances==
[[John Kongos]] first used one at Trident Studios in 1971, then in 1973 he acquired his own - it was used extensively at his Tapestry Studio, on his own recordings as well as [[Def Leppard]] ([[Pyromania (album)|Pyromania]]), [[Mutt Lange]], [[Alain Chamfort]], [[Tony Visconti]], [[Ryan Ulyate]] and many others.

In 1972 [[Pete Townshend]] of [[the Who]] used an ARP 2500 on the Who's ''[[Quadrophenia]]''.<ref name=nevison>((cite interview|url=http://www.richieunterberger.com/nevison.html|title=Interview with Ron Nevison by Richie Unterberger|access-date=26 January 2015|archive-date=4 December 2014|archive-url=https://web.archive.org/web/20141204045918/http://www.richieunterberger.com/nevison.html|url-status=live))</ref> Townshend built his own home studio to experiment and record, due to the enormous amount of time he spent creating his groundbreaking synthesizer orchestrations on both Quadrophenia, and the movie version of [[Tommy (1975 film)|''Tommy'']].

The ARP 2500 was extensively used by British producer [[David Hentschel]] on recordings such as "[[Funeral for a Friend/Love Lies Bleeding|Funeral for a Friend]]" from [[Elton John]]'s 1973 album ''[[Goodbye Yellow Brick Road]]''. Jeff Wayne's 1978 multi-platinum selling album ''[[Jeff Wayne's Musical Version of The War of the Worlds|War of the Worlds]]'' features the ARP 2500, including the sound of Martian speech.

In the 1977 motion picture ''[[Close Encounters of the Third Kind]]'',<ref>((cite web|url=http://www.soundonsound.com/sos/1996_articles/aug96/arp2500.html|title=ARP 2500|work=Sound On Sound|date=August 1996|archive-url=https://web.archive.org/web/20150206235210/http://www.soundonsound.com/sos/1996_articles/aug96/arp2500.html|archive-date=6 February 2015))</ref> a 2500 unit is used to communicate with [[Extraterrestrial life|aliens]]. [[Phil Dodds]], ARP's Vice President of Engineering, was on set to install and manage the synthesizer; [[Steven Spielberg]], liking his looks, cast him on the spot as an extra to play the 2500. The unit featured in the film consisted of a fully loaded main unit, two fully loaded wing cabinets and dual keyboards in a custom case.

It has been used by artists such as [[Aphex Twin]], [[David Bowie]], [[Vince Clarke]], [[Ekseption]], [[Faust (band)|Faust]], [[John Frusciante]], [[Jean Michel Jarre]], [[CEvin Key|Cevin Key]],<ref>((cite journal |last1=Reed |first1=Aleander |title=The Conscious Subconscious (1997) |url=http://litany.net/interviews/reed_interface |journal=Interface |publisher=Litany |access-date=31 January 2019))</ref> [[Kraftwerk]], [[Jimmy Page]], [[Vangelis]] and [[the Who]]. The composer [[Éliane Radigue]] has worked almost exclusively with the 2500.

==References==
((reflist))

==External links==
*[http://www.vintagesynth.com/arp/2500.shtml Vintage Synth Explorer]

((ARP Instruments))

[[Category:ARP synthesizers]]
[[Category:Analog synthesizers]]
[[Category:Modular synthesizers]]
[[Category:Monophonic synthesizers]]

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