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API 3124mb+ User Manual

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3124mb+
AllDiscrete
4ChannelMic/InstrumentPreamplifier
withStereoMixer
Operator’sManual
WrittenbyCarlJHoude
2015
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API 3124mb+ Specifications

Impedance and Levels IconImpedance and Levels
input impedance (mic)1500 Ω
input impedance (unbalanced)470 kΩ
output impedanceLess than 75 Ω
nominal levels (XLR channel output)+4 dBu
stereo output level (balanced)+4
stereo output level (unbalanced nominal)‐2
Audio Performance IconAudio Performance
clipping level (XLR channel output)better than +28 dBm
frequency response+0, ‐5, 10 Hz to 20 kHz (‐0.5 at 10 Hz)
noise EIN (mic)‐129
measured noiseBetter than ‐91 dBm/Below Nominal +4
distortion at +4 out0.03%
distortion at +22 out0.09%
Gain and Metering IconGain and Metering
gain range (150 Ω input)10 dB Min, 65 dB Max (Incl. PAD)
gain range (unbalanced input)14 dB Min, 50 dB Max
VU meter calibration (XLR outputs)OVU = +4 dBu (‐12, ‐6, ‐3, 0, +3, +6, +18)
Power and Dimensions IconPower and Dimensions
power consumption (quiescent)19.2 Watts
size19” × 1.75” (1U) × 10.5” Deep
size (boxed for shipping)23.25” × 6.5” × 16”
actual weight11.54 lbs.
shipping weight15.3 lbs.

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