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Raidho
Ralph's Industrial Electronics
Rank Concept
Rauna
Raysonic
RBH
RCM Audio
Real Cable
Reimer
Redpoint
Red Rock Audio
Red Rose Music
Red Wine Audio
Redgum
Reference 3A
Reference Recordings
Reflection Audio
Rega
REL Acoustics
Resolution Audio
Restek
Rethm
Reußenzehn
Revel
Revelation Audio Labs
Revolver Audio
Revox
RHF
Rhintek
Richard Gray's Power Company
Ringmat
Rives Audio
R.K.Cable
Robison Electronics
Rockna Electronics
Rockport Technologies
Rockustics
Rodec
Rogers
Rogue Audio 
Roister
Roksan
Role Audio
Rolf Kelch
Rossner & Sohn
Rotary Woofer
Rotel
Rothwel Audio Products
Royd Audio Speakers
RR Audio Laboratory
Ruark Acoustics
Runco
Russound