RCM Audio Sensor phono preamplifier in the loop September 25, 2015 Matej Isak RCM Audio Sensor phono preamplifier is in the loop and getting first few hours of listening. Very cleverly designed and involving phono preamplifier. Stay tuned for more soon… http://www.rcmaudio.pl/?action=oferta&fid=sensor&L0=sensor&L1=nn&of=0