The 1231V is a two-channel octave band EQ with 45mm faders, 3 U. All controls on the front panel are arranged clearly and logically. The frequency range is in accordance with ISO standard of 20 Hz - kHz. 20 The RF-filtered inputs and outputs are parallel to XLR, TRS and barrier strip balanced each run. With the input gain control, the input level of + / - 12 dB adapt. As a low-cut filter has a Bessel 18 dB / octave at 40 Hz, this is switchable -. The setting of the faders can be of ± 6 dB to + / - 15dB switch. The output level is displayed by four LEDs. A Clip LED indicates clipping within the EQ. The signal ground is separated by means of jumpers from the chassis ground. In bypass, as well as in electricity aid want to relay the inputs to outputs.