DAP PRE-202 - 2-kanaals microfoon voorversterker
RDL EZ-MPA1X - microphone preamplifier
RDL EZ-PH1X - stereo phono preamplifier
RDL FP-MP1 - studio quality microphone preamp
RDL STM-2 - adjustable microphone preamplifier
RDL STM-2X - switched microphone preamplifier
RDL STM-3 - high gain microphone preamplifier
RDL STM-DA3- microphone level distributor
RDL STM-LDA3 - studio quality microphone preamp