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Pioneer DJ began as the DJ equipment business of Pioneer Corporation, which released the first CDJ, the CDJ-500, in 1994. Its CDJ players and DJM mixers became fixtures of club booths, and rekordbox, its music management software, prepares the cue points, loops and beat grids those players read from USB and SD media. In 2014 Pioneer agreed to sell most of the DJ business to the investment firm KKR, and Pioneer DJ Corporation became an independent company in 2015. It renamed itself AlphaTheta Corporation on 1 January 2020 while keeping the Pioneer DJ brand, and in January 2024 it confirmed that new products would also launch under the AlphaTheta name. That is why newer gear such as the CDJ-3000X carries AlphaTheta branding, while older players and their firmware, manuals and support now sit on AlphaTheta’s help centre alongside pioneerdj.com.

Technics is the audio brand of Panasonic, formerly Matsushita Electric, and in DJ terms it means the SL-1200. The series began in October 1972 as a direct-drive hi-fi turntable, and the 1979 SL-1200MK2 added quartz-locked speed control and a slider pitch control that made it the standard deck for beatmatching and scratching. Later MK3, MK3D, MK5, MK5G and MK6 models refined the same basic design, with black versions sold under SL-1210 model numbers. Panasonic announced the end of Technics analog turntables in November 2010, relaunched the brand in 2014, brought the SL-1200 back as the hi-fi SL-1200G in 2016 and returned to DJs with the SL-1200MK7 in 2019. Technics puts cumulative sales of the series at about 3.5 million units. Used decks span five decades, so condition, region and mains voltage matter as much as the model number.

Allen & Heath is a British mixing-console maker based in Penryn, Cornwall, founded in 1968 and now part of the Audiotonix group. Its history in live sound goes back to custom consoles built for touring bands in the early 1970s, and its Xone range brings that background to DJ mixers. The Xone:92, launched in the early 2000s, became a fixture of house and techno booths thanks to its analogue signal path, four-band EQ and resonant Xone:VCF filters, and Allen & Heath still makes a revised version. The Xone:96 followed in 2018 with dual USB sound cards and a second cue system, while the compact two-channel Xone:23 of 2014 put the Xone filter in a smaller box. All three have analogue signal paths, so used checks centre mainly on pots, faders and inputs.

Rane is an American audio company founded in 1981 in Mukilteo, Washington, by former Phase Linear staff, and it started out making products for small live bands before becoming known for equalizers, crossovers and other pro audio processors. In DJ circles it is known for two-channel scratch mixers such as the TTM 56 and for its partnership with Serato: Scratch Live, which appeared in 2004, ran only with Rane hardware, and the 2006 TTM 57SL put that interface inside a mixer. In July 2016 inMusic, whose brands include Denon DJ, Numark and Akai Professional, announced it was acquiring Rane. The Seventy-Two, unveiled in 2017, the Seventy of 2020 and the Seventy-Two MKII of 2020 are products of that era. For used buyers the main divide is software: the newer mixers unlock current Serato DJ Pro, while the oldest Scratch Live hardware depends on legacy software.

Denon DJ has been owned since April 2014 by inMusic, which bought Denon DJ, Denon Professional and Marantz Professional from D&M Holdings. The same group owns Numark, Rane and Engine DJ, so the brands share a lot of software. Denon DJ’s modern identity comes from the Prime series, launched at NAMM in January 2017 with the SC5000 Prime media player, the X1800 Prime mixer and the VL12 Prime turntable. The players run Engine OS, analyze music on board and can play two tracks at once from a single unit. The SC6000 Prime players and X1850 Prime mixer followed in 2020 and remain the brand’s booth gear, while its site now leads with all-in-one standalone systems such as the Prime 4 G2, Prime Go+ and SC Live 4. For used buyers, the draw is a laptop-free, streaming-capable setup built on Engine DJ rather than rekordbox.

Numark was founded in Edison, New Jersey, in 1971 by Harry and Robert Kotovsky, and it is credited with the first DJ mixer with a built-in sampler, the DM1775. In 1992 Jack O’Donnell bought Numark’s assets, and he went on to found inMusic, now based in Cumberland, Rhode Island, which also owns Denon DJ, Rane and Akai Professional. Modern Numark is best known for DJ controllers. The Mixtrack line is its entry-level Serato range, the larger NS6 and NS7 four-channel Serato controllers now sit on its legacy list, and the Mixstream Pro family runs the same Engine DJ operating system as Denon DJ’s standalone players, with built-in Wi-Fi streaming. Used Numark gear is plentiful, and the main things to check are jog wheels, faders and whether current software still supports older models.