Manley Massive Passive Stereo masteringversion, 2 channel EQ, 4 Bands per channel, All-Passive tone sculpting circuitry, Unique Shelf curves use the "bandwidth" control, Overlapping and Interleaved Frequency choices, Every band switchable to shelf or bell, Vacuum tube make-up gain and line drivers, Parallel symmetrical topology, Premium components throughout, Passive HP and LP Filters plus gain trims , SPECIFICATIONS: Ins & Outs Balanced XLR & 1/4" (accepts unbalanced), Level +4 dBu nominal, internal switches for -10 operation, Bypass Switch bypasses EQ & tube circuits (not hardwire), 44 Frequencies (roughly 1/4 octave spacing), Frequency Range: 22 Hz to 27 kHz, EQ Boost/Cut Range : 20 dB boost, 20 dB cut, Nominal Q range: 1.5 to 3 (uniquely active in shelf modes), Frequency Response: ±2 dB: 8 Hz to 60 KHz, Maximum Output @ 1.5% THD +37 dBv; +26dBv @ 20 Hz, THD & Noise (1KHz @ +4 dBu): 0.06%, Noise Floor (referred to +4dBu): -85 dB (A Weight), Dynamic Range: 120 dB