1. 2231 Equalizer 2. Sound Equipment Signal Pheripheral 2231 Equalizer Model 2231 Picture Nominal Impedance Balance 120KΩ, unbalanced 60KΩ ... Dynamic Range >118dB, unweighted Input Noise Damping ±6dB range Signal to Noise >94dB, unweighted, ref: +4dBu, 22KHz measurement ... bandwidth Output Noise Damping ±15dB range Signal to Noise >90dB, unweighted, ref: +4dBu, 22KHz measurement ...