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| Benchmark PRE420 |
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Benchmark PRE420
The Benchmark PRE420 a remarkable four-channel microphone preamplifier with an integrated stereo mix bus and stereo/mono solo bus in a sleek, 1RU chassis. The PRE420 is designed for maximum transparency, wide bandwidth, low-noise, low-distortion, and superior RF immunity. It is well suited for the most demanding applications in studios and live venues.
The PRE420 is the next evolution of Benchmark's legendary MPS-420 microphone preamplifier. We have improved the performance while adding meters, a mix bus, a solo bus, and an internal power supply. The added features do not compromise the performance of the classic Benchmark design. In all respects, the PRE420 meets or exceeds the performance of the MPS series preamps
Benchmark PRE420's featuresThe PRE420 features an astonishingly lownoise stereo mix bus driven by Benchmark's proprietary MirrorPan circuitry to achieve precise, distortion-free, constant-power panning. The mix bus allows pristine directto-stereo recording from up to 4 microphones. The balanced stereo outputs are equipped with meters and a master level control. A solo bus allows monitoring of individual microphones as well as any stereo or mono mix of microphones. The solo bus is routed to the balanced control room outputs and to the headphone amplifier. The control room outputs have a switch that enables mute on headphone insertion. The PRE420 includes the HPA2 -Benchmark's signature high-current, 0-Ohm. headphone amplifier. The HPA2 is capable of delivering the full performance of the
PRE420 into the difficult loading presented by many headphones. Each of the PRE420's four microphone inputs includes switches for +48V Phantom power, a 20dB pad, and a 40Hz high-pass filter. The PRE420 achieves outstanding performance over a wide range of input levels. Gain is controlled by matched 41-detent pots and is adjustable over a range of 22dB to 60dB (without pad), or 2dB to 40dB (with pad enabled). The mix bus can provide an additional gain of up to 6 dB. The PRE420 has four direct outputs, two control room outputs, and two stereo outputs. All outputs feature low-distortion, highcurrent drivers that easily handle long cables and other less-than-ideal loads. A rugged 1 RU enclosure includes an internal power supply that supports all international voltages and has generous margins for overvoltage and under-voltage conditions. It features a core-banded toroidal transformer in a shielded enclosure.
The entire PRE420 has a 500 kHz bandwidth. Wide bandwidth demands exceptional RF filtering and shielding: The multi-layer printed
circuit board uses a special construction technique that creates a 3-dimensional shield surrounding all signal traces. Each microphone input features Benchmark's exclusive CMF1 common-mode RF input filter. This circuit removes common-mode RF interference without affecting the balanced microphone input signal. The CMF1 has always been a key component in Benchmark preamps, and has resulted in a proven track record for exceptional performance in difficult high-RF venues. Microphone pre-amplifier circuits usually
suffer from non-linear performance at ultrasonic frequencies. This non-linearity causes inter-modulation distortion (IMD) components
that fold down to audible frequencies. Unlike harmonic distortion (THD), IMD produces distortion tones that are very un-natural and
non-musical. IMD also masks and alters the subtle details of delicate high-frequency transients such as those produced by bells.
Benchmark MPS series preamps have always had outstanding high-frequency performance as well as freedom from IMD. The PRE420
takes the Benchmark design one step further, and achieves the lowest IMD that we have ever measured in a microphone preamplifier.
We believe that you will enjoy the performance and features of the PRE420.
Benchmark PRE420's specificationsFour Transformerless Microphone InputsFour Balanced Direct Outputs (XLR)Balanced Left and Right Main Outputs (XLR)Balanced Left and Right Control Room Outputs (XLR)HPA2 "0-Ohm" 1/4" TRS Headphone OutputPrecision-Matched Monolithic Low-Noise Transistor Quads on Each Microphone InputCMF1 Common Mode RF Filter on Each Microphone InputHigh-Current High-Speed Low-Capacitance Phantom Protection CircuitsFully Protected Against Phantom Hot-Plug and Cable-Shorting ScenariosBalanced Transformerless Inputs and Outputs+48v Phantom Power Switch on Every Microphone Input40 Hz High-Pass Filter Switch on Every Microphone Input (12 dB/octave)20 dB Pad Switch on Every Microphone InputMatched 41-Detent First-Stage Gain Controls on Every Microphone Input60 dB Maximum First-Stage Gain, Adjustable to 70 dB22 to 60 dB Gain (pad off), 2 to 40 dB (pad on)+27 dBu Maximum Input Level (with pad), +7 dBu (without pad)+29.5 dBu Maximum Output Level on all Balanced Outputs+ 23.5 dBu Maximum Headphone Output LevelMirrorPan Low-Distortion Constant-Power Pan Controls (1 per input channel)Solo Switches (1 per input channel)Mono/Stereo Solo Switch for Flexible Monitoring41-Detent Control Room/Headphone Level Control41-Detent Main Output Level ControlControl Room "Mute on Headphone Insertion" Mode Switch (rear panel)Intensity Modulated Signal Presence LEDs (Green - 4 on direct outputs plus 2 on main outputs)+24 dBu Warning LED (Red – 4 on direct outputs plus 2 on main outputs)Solo Warning LED (Yellow)+48V Phantom Warning Indicators (Yellow - 1 per input channel)Power LED (Blue)Ultra-Quiet Linear Power Supply with Rear-Panel Input Voltage SelectorComplies with FCC and CE RegulationsRoHS Compliant
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Studio Economik UA Apollo NEWS! We are placing the 1rst order for UA Apollo right now, available end February. Limited quantity available on first shipment. Pre-orders available. Please contact us to get yours!
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