behringer, fbq3102hd

31-band Stereo Graphic Equalizer with Feedback Detection System
  Behringer FBQ3102HD 31-band Stereo Graphic Equalizer (FBQ-3102HD / FBQ 3102HD)

The Behringer Ultragraph Pro FBQ3102HD 31-band graphic equalizer is packed with the professional features you need. An FBQ Feedback Detection system quickly locates problem frequencies.