Benchmark MPA1 Manual de Instruções descarregar pdf (Página 4)

PRE420 Instruction Manual – rev. E Page 4

Overview

The PRE420 is a 4-channel microphone

preamplifier/mixer and is designed to achieve

the highest performance available in a

microphone preamplifier. 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.

The PRE420 features an astonishingly low-

noise stereo mix bus driven by Benchmark's

proprietary MirrorPan™ circuitry to achieve

precise, distortion-free, constant-power

panning. The mix bus allows pristine direct-

to-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, high-

current 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 over-

voltage and under-voltage conditions. It

features a core-banded toroidal transformer

in a shielded enclosure.

The entire signal path of the PRE420 has a

generously wide bandwidth: 500 kHz. This

creates a significant demand for exceptional

RF filtering and shielding – a demand

Benchmark fulfills.

All signal paths in the PRE420 are

aggressively protected from RF and magnetic

interference. For example, a special

construction technique is employed with the

multi-layer printed circuit board to create a 3-

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