Graphic Equalizers EQ231L   »click for larger image« The EQ231L is a dual 31 band EQ with the following specifications: Constant Q filters in 1/3 octave increments Frequency response of 10Hz~35kHz ±3dB Signal-to-Noise = 90dB THD+Noise <0.004% RF filtering 10 segment LED's for monitoring input and output levels Variable high and low cut filters Selectable boost/cut ranges of ±6dB and ±12dB Lighted sliders Bypass switch to completely disengage all circuitry Balanced XLR and ¼" TRS phone jack input and output connectors XLR sub output with variable frequency Shipping Weight: 8 lbs. EQ215s »click for larger image« The EQ215s is a dual 15 band graphic EQ with the following specifications: Constant Q filters in 2/3 octave increments Frequency response of 20Hz~20kHz ±2dB THD+Noise <0.05% (1kHz +3dB) Distortion 0.03% Signal:Noise Ratio >90dB RF filtering LED's for monitoring input and output levels High pass filter Bybass switch to completely disengage all circuitry XLR sub out with variable low pass 30~200Hz Balanced XLR and ¼" TRS phone jack input and output connectors Shipping Weight: 7 lbs. EQ215 »click for larger image« The EQ215 is a dual 15 band graphic EQ with the following specifications: Constant Q filters in 2/3 octave increments Frequency response of 20Hz~20kHz ±2dB THD+Noise <0.05% (1kHz +3dB) Distortion 0.03% Signal:Noise Ratio >90dB RF filtering Input gain control and clip indicator High pass filter Bybass switch to completely disengage all circuitry RCA, balanced XLR and balanced ¼" TRS phone jack input and output connectors Shipping Weight: 9 lbs.