To this the CA81mk2 adds a transformer-balanced line level input as well. Mic input has a gain range of -80dB to -20dB in 5dB increments, and the line input has a gain range of -20 to +10dB.  Each channel features a mic/line sensitivity switch, front switches for phantom power, polarity, 300 / 1200 ohms input impedance, in/out switch for the EQ section, a level control for fine tuning of the output level, and a 5-segment headroom meter.In the EQ section the two mid bands and HP filter feature classic inductor based designs renowned for their musicality.  Additionally, both mid bands feature a “Q” switch to select between wide and narrow bandwidth options. Low and high bands are selectable between shelf or peak.The new version uses relay-controlled gain switching, and the front XLR connector automatically overrides the rear connector when in use.  So when you wish to use the front XLR, you don’t need to bother with disconnecting the rear XLR.  You can have the rear connector permanently plugged in continuously.The CA81mk2 is built with gold-plated ELMA switch for gain and frequency selecting, tantalum caps in the signal path, gold-plated relays for internal switching, vishay potentiometers in a powdercoated steel chassis.Controls:
Gain (mic/line, selectable )
Output fader
Phantom Power
Phase Reverse
EQ in/out
HPF: 50Hz, 80Hz, 160Hz and 300Hz
LF: Freq 33Hz, 56Hz, 100Hz, 180Hz, 330Hz, peak - shelving switch
LMF: 220Hz / 270Hz / 330Hz / 390Hz / 470Hz / 560Hz / 680Hz / 820Hz / 1kHz / 1.2kHz +/- 18dB, Hi-Q switch
HMF: 1.5kHz / 1.8kHz / 2.2kHz / 2.7kHz / 3.3kHz / 3.9kHz / 4.7kHz / 5.6kHz / 6.8kHz / 8.2kHz +/- 18dB, Hi-Q switch
HF: 3.3kHz / 4.7kHz / 6.8kHz / 10kHz / 15kHz +/- 16dB, peak - shelving switch
Headroom meterPerformance:
Mic Input Gain: -20 to -80 dB in 5 dB steps
Line Input Gain: +10 to - 20dB in 5 dB steps
Mic Input impedance: 300/1200 ohm switchabel from frontpanel
Line Input impedance: 10 kohm
Instrument Input Impedance: >1 Mohm. relayswitched through the input transformer to get the transformers charachter!
Switchable Phantom Power
Switchable Phase Reverse
Frequency response: 10hz - 20khz +/- 0.5dB. 10-60kHz +/-3.0dB ( EQ off )
Distortion:. < 0.07% @ 1khz
Output: balanced, >  + 26dB with 600ohms load
Headroom meter: prefader, calibrated to indicate clip @ +26dB / 600 ohm with level at max.

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