Rockville REQ42-S Silver 19" Rack Mount 2x21 Band Equalizer w/Spectrum Analyzer Rockville REQ42-S Silver 19&quot; Rack Mount 2 x 21 Band Equalizer w/Spectrum Analyzer. 19&quot; Rack Mountable.Dual Channel 21+21 Band Graphic Equalizer (total of 42 bands). Blue LED on each Equalizer Slide Control. RCA stereo input: DVD/Tape/Tuner/Aux-MP3 with Front Panel Selector Switch. RCA Stereo Record Output. Front Panel 3.5mm iPod/MP3 Player Input Jack. Dual VU Meters Level Monitor. Individual LED Indicators. Outputs-RCA (REC, Mail).Multi Color LED Display. Low/High Function. Frequency Response: 20-20,000 Hz. Signal to Noise Ratio: 80dB. Removable Rack Mount Brackets.