R & K tech ab ay isang tagapagbigay ng mga produkto at serbisyo tulad ng telepono ng headset,video system, medical,sistema ng background music,pampublikong address equipment,home theater system,microphones, kapasitor / electrostatic,microphones, paglipat ng bakal,microphones, cardioid tugon,microphones, pressure-gradient/velocity,microphones, stereophonic,microphones, radyo, wireless,microphones, maliit na larawan,microphones, ruggedised,microphones, mapanganib na lugar, flameproof,microphones, hand-gaganapin,microphones, tumayo uri,microphones, sulapa,microphones, lalamunan,microphones, sasakyang panghimpapawid,microphones, laud-ispiker,mikropono ay nakatayo at aksesorya,mikropono booms,crossovers para sa loudspeakers,loudspeakers, electrostatic,loudspeakers, gumagalaw likawin,loudspeakers, paglipat ng bakal,loudspeakers, piezoelectric (kristal),loudspeakers, pagpaparami sungay,loudspeakers, reverse sungay,loudspeakers, sungay,loudspeakers, multi-element,loudspeakers, muling kalaban,loudspeakers, elliptical,loudspeakers, mapanganib na lugar, pagsabog patunay,loudspeakers, hindi tinatablan ng panahon,loudspeakers, init at kahalumigmigan lumalaban,loudspeakers, maliit na larawan,loudspeakers, mabibigat na tungkulin, at discotheque entablado paggamit,loudspeakers, mataas na kapangyarihan,loudspeakers, salamin,loudspeakers, flat panel,loudspeakers, haligi uri,loudspeakers, ceiling uri,loudspeakers, palawit orbit,loudspeakers sa cabinet,loudspeakers, high fidelity (hi-fi),loudspeakers, personal computer (pc),loudspeakers, personal computer (pc), wireless,loudspeakers para sa home theater system,laud-ispiker kit, tahanan assembly,loudspeakers, mobile komunikasyon, motor sasakyan,acoustic mga kahon,megaphones,laud-ispiker cones,tweeters,woofers,laud-ispiker gaskets,laud-ispiker boses likawin formers,driver (magnetodynamic unit) para sa loudspeakers,laud-ispiker diaphragms,loudspeakers, motor sasakyan,headphone, gumagalaw likawin,headphone, paglipat ng bakal,headphone, double impedance,headphone, tropicalised,headphone, stereo,headphone, high fidelity (hi-fi),headphone, single earpiece,headphone, double earpiece,headphone, helmet uri,headphone, cordless,monitor, personal (in-tainga), para sa mga musikero,earphones, dictating machine,hearing aid system, cinema at institutional,echo kuwarto, artipisyal,audio-visual (av) nagsi-sync equipment,faders, electronic, pag-record studio,modulators para sa audio equipment,audio produksyon control desk at paghahalo nakatayo, propesyonal, studio at portable,audio-video paghahalo system,may kakulangan recording blangko, studio master discs,mga bahagi para sa propesyonal na-record kagamitan,tunog ng kagamitan sa pag-edit,mga pelikulang at tape para sa pang-industriyang pag-record,propesyonal na duplicators para sa audio cassettes,digital audio tape (dat) duplicate equipment,duplicating, paikot-ikot at packaging machine para sa audio cassette tape,paglaki system, sentralisadong,recorder, laser, audio,recorder, magnetic tape, pang-industriya,voice recorder komunikasyon, multichannel,mixers at mga console, audio,voice processing system, modular,sound synthesis appliances, audio paggawa ng sipi,synthesizers, boses,music recording studio installation, kumpleto,tunog paghahalo at pag-aanak kagamitan para sa musika pangkat paggamit,pagre-record at playback equipment, recording studio,tunog sistema ng pag-record, centralized, remote,soundtrack recording at playback equipment, film,karaoke system at kagamitan,cinema sound installation,sabay-sabay na pagbibigay-kahulugan equipment,wika laboratoryo kagamitan,audio-visual (av) na mga sistema, interactive,theatre o bulwagan ng konsiyerto sound systems,pasahero address system para sa sasakyang panghimpapawid at mga tren,exhibition personal komentaryo equipment,music centers, deck, tuner-amplifier at tape player, pinagsama.