231 is an equalizer with advanced features:
---31 feedback frequency display
---Feedback threshold adjustment
---Variable frequency high and low pass filter
---Input, output peak indication
---The input signal is throb VU indication
--- Proportional-Q
---(Balance/Unbalance)Constant output level
SPECS
SNR(A-weighting): >95dB
Freq. Response: 10Hz-40KHz(+/-0.3dB)
THD: <0.03%
Center frequency filter: 3rd order filter
Center frequency accuracy: <+/-1.5%
Input filter: Variable high and low pass filter
Frequency point maximum ascending or decay: +/-12dB
DR: 118dB
Input Gain Control: +/-20dBU
Power: AC220V/240V,50Hz-60Hz
Dim: 483x133x200mm
Weight: 4.8kg