The API 3124+ is a discrete, high quality, compact, 4-channel mic/line preamp, plus D.I.
It is equipped with the RE-115 K mic input transformer and the proprietary API output transformer found in the 512c single mic pre and throughout the API product line. The unit has an internal 48-volt phantom power supply, which is switchable for each channel, as well as -20dB pad switches that affect both the mic and Hi-Z instrument inputs, both located on the front panel.
Another feature of the 3124+ is that it can provide up to 65dB of gain to an output clip level of +28dBu. Additionally, the Hi-Z front panel inputs feed directly to the op amps, which allow a low level input such as a guitar or bass to be amplified without a matching transformer or direct box. These Hi-Z inputs can take input levels as high as +20dBu, making them perfect for keyboards and other high level devices. The mic preamp outputs are on rear panel male XLR connectors.
Input Impedance: 1500 Ohms Mic, 470 K Ohms Un-Balanced, HI-Z in
Output Impedance: Less than 75 Ohms Channel Outputs
Nominal Levels: XLR Channel Output +4 dBu
Stereo Output Level
Unbalanced: nominal -2Balanced: +4
Clipping Level: XLR Channel Output better than +28 dBm
Frequency Response: +0, -5, 10 Hz to 20 kHz (-.5 at 10 Hz)
Noise EIN: -129 Mic, -125 Un-Bal. Actual
Measured Noise: Better than -91 dBm / below Nominal +4
Distortion: All Outputs at +4 out, .03%, at +22, .09% Max
Gain Range
150 Ohms Input 10 dB min65 dB Max (inc. PAD)Un-Bal. Input 14 dB min50 dB Max
VU Meter: Calibrated for XLR Outputs, OVU=+4 dBu, (-12, -6, -3, 0, +3, +6, +18)
Controls: GAIN, PAD (20 dB), 48 Volts, POL (polarity), MIC (mic/un-bal), VU, AC
Power Consumption, Quiescent: 19.2 Watts
Size: 19" X 1.75" (1U) X 11" Deep
Size (Boxed for Shipping): 23.25" X 6.5" X 16.5"
Actual Weight: 10.38 lbs
Shipping Weight: 14.06 lbs
