double bass cardioid microphone + quadruple piezo with preamp and tone control
cello cardioid microphone + piezo with preamp and volume control
violin and viola omnidirectional microphone + double piezo with preamp and volume control
violin and viola passive double piezo pickup with low pass filter
cello passive double piezo pickup with low pass filter
double bass passive quadruple piezo pickup with low pass filter and volume controle
