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