Features : 1. 12 independent digital notch filters per channel, controlled automaticallyfrom 40 Hz to 20 KHz. 2. Filter width: user-controllable - either 1/10 or 1/5 octave*, constant "Q" 3. Resolution: 1 Hz 4. Time required to find and eliminate feedback: 0.4 seconds, typical @ 1KHz 5. Number of Dynamic vs. Fixedfilters per channel: user selectable.Last configuration stored inmemory. Input/output Input/Output Maximum Signal Levels: Balanced +27dBV peak, unbalanced +21 dBV peak Output Drive: Unit will perform as specified driving a load >600 Ohms Input Impedance: Balanced or unbalanced >40K Ohms, PIN 2 high Output Impedance: Balanced or unbalanced 150 Ohms nominal, PIN 2 high 7. Bypass: True power off bypass Headroom: +23 dB peak @ 4 dBV nominal input, balanced I/O Connectors: XLR-3 and 1/4"TRS Performance Frequency response: 20 Hz - 20 KHz +/- 0.3 dB Gain matching: +/- 0.2 dB Spectral Variation: + .25 dB, 20 Hz to 20 KHz SNR - Dynamic Range: >100 dB THD: .005% at 1 KHz / < 0.01% 20 Hz-10 KHz / < 0.025% 10 KHz - 20 KHz Dynamic Range: >105 dB Power input:230 VAC: 200 - 240 VAC 50/60Hz Dimensions:48.3 x 4.5 x 15.9 cm nominal Weight:8.0 lbs. (3.6 kg) nominal.