BENCHMARK
PRE420 4-CHANNEL MIC PREAMP / STEREO MIXER
Unmask Your Audio™ with the PRE420 - a remarkable four-channel microphone preamplifier with an integrated stereo mix bus and stereo/mono solo bus in a sleek, 1RU chassis.
What makes one mic-pre superior to the others? Even high-end preamplifiers can mask subtle details because of intermodulation distortion, a symptom of RF interference and non-linear performance at ultra-sonic frequencies. The PRE420's innovative circuitry provides ultra-low distortion over a 500kHz bandwidth while maintaining RF-immunity in the most demanding environments.
The PRE420 is equipped with Benchmark's exclusive CMF1™ RF-filter. The CMF1™ has been extensively tested and proven in Benchmark's MPS mic-pre series by experienced studio and remote recording engineers in heavy RF fields - such as venues in close proximity to broadcast antennas. This RF-immunity is coupled with ultra-low distortion performance at high-frequencies beyond the reach of most mic-pres, giving your audio remarkable realism. With amazingly low THD+N of 0.00024% (see specs), we welcome you to compare the PRE420's performance specifications with any other mic pre available.
Benchmark's proprietary MirrorPan™ circuitry minimizes distortion while ensuring constant-power panning with pin-point precision. MirrorPan's™ innovative mirrored-circuitry, from which the name is derived, eliminates the non-linear distortion caused by potentiometer wiper-current. The result is excellent channel seperation and remarkably accurate imaging. The center-detent position is factory calibrated for precise center-placement.
An elegant and completely unique feature set compliments the uncompromised sonic integrity of the PRE420. A solo section allows monitoring of any channel or combination of channels (with switchable stereo/mono) via control room XLR outputs and the integrated HPA2™ - Benchmark's signature high-current, 0-Ohm headphone amplifier. The PRE420's main mix bus XLR outputs are monitored via a dual, variable intensity signal level meter and peak-warning indicator*. Each of the four channels has an independent direct XLR output, a variable intensity signal level meter and peak-warning indicator*, and MirrorPan™ control. Each channel features a precisely matched 41-position first-stage gain control factory preset to a maximium gain of 60dB (internally adjustable up to 70dB for special applications).
The convenient flexibility of these unique features in no way compromises the pristine audio path. The PRE420's RF-immune, wide-bandwidth circuitry faithfully delivers stunningly high resolution to all direct, stereo, control room, and headphone outputs.
For the studio, the symphony hall, and the quest for superior recordings - Unmask Your Audio™ with the PRE420.* All 'over-warning' red LEDs are factory calibrated to +24dBu but may be adjusted to other desired signal levels based on the studio's metering practices.
Summary of FeaturesUltra-low noise/distortion: (THD+N @ 22dB Gain 10Hz-20kHz = 0.00027%)
RF-immune, wide bandwidth (500kHz)
Stereo mix bus & isolated stereo/mono solo bus
MirrorPan™ - Benchmark's proprietary zero-distortion, constant-power panning technology
4 direct XLR outputs, 2 control room XLR outputs, & 2 stereo XLR outputs
HPA2™ - Benchmark's signature high-current, 0-Ohm headphone amplifier with convenient, switchable mute control room output on headphone insertion.
Adjustable peak warning indicator & variable intensity signal level meter on each channel & mix bus
Independently switchable +48V phantom power, 40Hz switchable high-pass filter, & -20dB pad.SPECIFICATIONS
Balanced Inputs Number of Microphone Inputs, XLR type 4 Balanced Outputs Number of Ballanced Outputs 9 Number of Direct Outputs, XLR type 4 Number of Stereo Ouputs, XLR type 2 Number of Control Room Outputs, XLR type 2 Number of Headphone Output, 1/4" TRS 1 THD+N THD+N @ 22dB Gain, 10Hz-20kHz, +27dBu Out 0.00024% (-112dB, 2.4PPM) THD+N @ 35dB Gain, 10Hz-20kHz, +27dBu Out 0.0003% (-110dB, 3PPM) THD+N @ 55dB Gain, 10Hz-20kHz, +27dBu Out 0.00085% (-101dB, 8.5PPM) Gain Min Gain 22dB Max Gain 60dB Max Gain (On Request) 70dB Pad -20dB EIN EIN @ 60dB Gain, 20Hz-30kHz, Inputs Common -132dBu EIN @ 60dB Gain, 20Hz-30kHz, 40 Ω -129dBu EIN @ 60dB Gain, 20Hz-30kHz, 150 Ω -126dBu EIN @ 60dB Gain, 20Hz-20kHz, Inputs Common -133.5dBu EIN @ 60dB Gain, 20Hz-20kHz, 40 Ω -131dBu EIN @ 60dB Gain, 20Hz-20kHz, 150 Ω -128dBu HPA2™ Headphone Outputs Output Impedance 0 Ω Output Level Control Stereo Control on Front Panel Output Level Range (at 0 dBFS) into 60 Ω Load Off to +21 dBu Dimentions 1 RU Wide, 1 RU High Depth behind front panel 11.75" (298.5mm) Overall depth including connectors
(without power chord)12.625" (320.7mm) Width 17.5" (444.5mm) Height 1.725" (43.8mm)
