https://ebssweden.com/content2/amps/ebs-reidmar-750-2/   EBS Reidmar 750 Input Impedance 1 Mohms / 100 pF Gain Range -00 - +30 dB Character Filter Shelving, High/Low Pass,   +7 dB @ 40 Hz, -2 dB @ 800 Hz,+3 dB @ 10 kHz Tone Controls,  Bass Shelving +/-18 dB @ 60 Hz Mid Bandpass Filter 100 – 6000 Hz +/- 12-15 dB Treble Shelving +/-18 dB @ 6 kHz Bright Shelving +15/-0 dB @ 10 kHz Drive min/max 0/34 dB Balanced Output   -10 dBv, Pr