Crest Audio IPRO ONE Manuel - Sayfa 3

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IPro One

™

DESCRIPTION:

The IPro One is a microphone or line input processor that is especially designed to optimize audio signals (low or

high impedance) for recording or live applications. It is an improvement over a standard mixer's channel strip for direct

recording of a microphone or line instrument since it has functions not found in other analog signal processors. Here is a

brief summary of those features.

There are two balanced inputs, a low impedance XLR and high impedance 1/4" phono, which can be used

simultaneously. The microphone input has the same discrete circuitry that is used in console mixers, using transistors

claimed by their manufacturer to be the lowest noise devices in the world. Phantom power (+48 V), a +6 dB

to +56 dB gain adjustment control, a polarity reverse switch, and a 20 dB pad are available to match (and power)

whatever low impedance microphone is connected to it. Front and rear XLR input connectors allow the unit to be used

on the fly or as part of a permanent install. A tunable (10-350 Hz, 12 dB per octave) low cut filter is online to remove the

troublesome low frequency rumble and breath-blast noise that microphones often encounter. The mic pre-amp is

enabled with a switch so it can be turned off if the XLR input is not used.

In addition to the low impedance input, a balanced (TRS) high impedance (200 k ohms balanced, 100 k Ohms if

used unbalanced) line input is available which also has front and rear input jacks, permitting a guitar (or other line-level

source) to be connected easily even if the IPro One is mounted in a rack. Unlike the XLR input, the front panel jack

automatically disconnects the rear panel jack, allowing the unit to be switched from a rear jack configuration to a front

panel one simply by inserting a jack. This input has its own level control (off to 20 dB of gain) and can be mixed with the

XLR input if desired. The high and low impedance inputs are summed together and are routed to the rear insert jack

before proceeding to the input of the first parametric filter. The insert jack is enabled from the front panel. Even when not

in the signal path, the send (tip) signal is still present. This can be used as a dry pre-amp output, which is especially

useful when both the dry (pre-processing) and wet (post-processing) signals are required.

There are two parametric equalizers in the IPro One. Each has frequency, bandwidth, and level adjustments. Since

the usual use for a parametric EQ is to notch out an offending frequency, a deep 24 dB cut and a 12 dB boost is

available. There is considerable overlap in the two frequency ranges so that they can be set close together for the

occasional difficult feedback problems. With a bandwidth adjustment of 1/6 to 2 octaves, gentle or severe alterations can

be made. Each parametric equalizer has its own on/off switch to route the signal around it if it is unused.

The second parametric equalizer has an additional feature. It can be moved out from the main signal path into the

dynamic section's side-chain path, where it is in series with (after) the side-chain insert jack of the RMS detector. By

setting it up in this mode, it can be used to define the frequencies that control the dynamics circuitry (expander,

compressor, and limiter). This is used for de-essing, for removing rumble modulation, or for specifying a problematic

frequency band to compress. When configured in this manner, any external signal brought in through the side-chain

insert jack passes through this equalizer before it is sent to the detector to allow frequency shaping to be applied to that

source as needed. The on/off switch still bypasses this filter even in this mode, just as you would expect.