The new sound of cumbia sonidera is unique, identificable, its melodic organ and guacharaca like the old tropical cumbia groups of 70's, evoking to the old Colombian "tamboras" with classic instruments like conga, (or called timbal), a Mexican cumbia contribution, keyboard (a derivation of the Cumbia Rock of Rigo Tovar), harp (retaken of the cumbia costeña of states of the Southeastern of Mexico), electrical guitar (derived from the used ones in the beginning of the Mexican Cumbia by Mike Laure and Xavier Passos), Keyboard Synthesizers (derivation of Cumbia-Rock of principle of 70's), drums, sax (folclore of the east, north and Southeastern of Mexico), güiro and trumpets (a contribution from Mexico to the world) and the piano accordion (folclore's instrument in "Música norteña", from northern Mexico) of Mexico. The Cumbia Sonidera is more instrumental and with little lyrics in some cases.
Another particular characteristic is the deformation of voices in the musical narrations that it belongs to the executions of the sonideros DJ or, applying effects of delay and pitch (called thus in software) in the reproduction of voices, this variation began decades back with old equipment of sound of several brands, one of the most used were the Radson Brand of Mexico, Majestic between others, used "trompetas" (conical loudspeakers) between many others types of amplifiers and mixers, "bounces", LP players, equalizers, derivative of this, many songs recorded in LP that had the DJ were in cumbión base (music with the double of speed of rhythm of cumbia), it was necessary to adapt them at the particular speed of the Mexican to dance, that is slower, so the speed of reproduction is lower, to obtain musical tones and voice lower at least one eighth musical scale, reason why the sounds were of more low tones, to avoid discrepancy in the DJ voice, that is used to speaking and sending greetings while music is executed, forces to speak with more bass voice, this phenomenon has stayed per years, and although each DJ has their method of musicalización all have this common denominator, therefore, strictly speaking, the sounds of voices of the cumbia sonidera wasn't arise properly from the musical groups of cumbia, only by DJ' s that somehow imposed like combined voice and music cumbia and more effects in the events, modifications done on the LP and CD of cumbia from Mexico.
Years later gradually, the cumbia groups making an emulation in his recordings of all these effects from DJ that already had popularized the "sonideros" (DJ), and that, combined to the instrumental components mentioned before, evolved and they were conjugated in which now it is known like cumbia sonidera formally, that without a doubt would properly make one more a more formal presence in the record market of these tendencies not created by cumbia groups, only by the DJ; therefore it begins, gradually, the gestation of cumbia sonidera already like musical genre properly.
This genre is popular in central Mexico and USA, which genre stems from the word "sonido" (sound) or the word to describe DJs that spin popular club music and cumbia at parties or bailes. Sonidero music has gained immense popularity in large part because of the mobility of the sonidos and the willingness of DJs to give out dedications to peoples barrios(neighborhoods) or Bandas. DJs also manipulate the cumbias by slowing or speeding them up, creating what are called "mega cumbia mixes", and adding their own intros and outros to their presentations. The DJs will also include sets of Mexican heavy metal, salsa, and other popular music.
The Cumbia Sonidera has a number of "publicists" otherwise known as publicistas . They help introduce new music, promote gigs, and etc.
External references 
- http://www.conaculta.gob.mx/saladeprensa/2005/24ene/cumbia.htm Colombian documental in spanish