Crest Audio IPRO ONE Manuel - Sayfa 4

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A key part of the IPro One

controlled amplifier and true RMS detector, it has very low distortion and noise. Incorporated in the processing is a

downward expander, a compressor, and a limiter. Each has an independently adjustable threshold control. The expander

and compressor sections also have ratio controls. There is a side-chain insert in the detector path that can be enabled

from the front panel (see previous comment). The expander is of soft knee topology, and has a ratio control to allow it to

be used as a gentle-slope noise reduction circuit (low ratio), or a gate (high ratio). A threshold LED illuminates when the

expander is active. The compressor is also soft knee, but has a more gradual knee action for even smoother transitions.

It can be adjusted from no compression (1:1) to limit (infinite:1). The limiter is a compressor with a fixed infinite:1 ratio, a

faster knee transition, and an LED to show when it is functioning. All have preset (program dependant) attack and

release times. A twelve segment gain reduction meter displays all VCA activity (expander, compressor, and limit) so that

control action is easily seen, making adjustments a snap.

Heavy compression will give the perception of darkening the signal, since the low frequency components (which

have the most energy) dominate the compressor action. As the signal is compressed, the treble material is reduced at

the same ratio as the bass, causing it to lose definition. To compensate for this apparent loss and to add a new sheen to

signals which do not have much high frequency content, the SmarTube

high frequency harmonic generator based on our SmarTube tube simulation circuitry. It adds tunable upper frequency

harmonics, and will add pleasing high frequency detail not found in the source. A unique feature of the circuitry is that it

behaves as a tube does in its distortion characteristics and is level dependant. This means that more harmonics are

created at higher levels, which decrease as the source fades out, just as a natural sound would. This can bring a mic to

the front of a mix, or add atmosphere and clarity to an instrument.

There may be an occasion when certain frequencies must be compressed then added back to the original "dry"

signal, similar to using the IPro One as one of the bands of a multi-band compressor. A blend control was added so that

this could be done without having to sacrifice an external mixer channel (if one is available) to accomplish this feat.

Simply turn it to "wet" and set up the frequency band and dynamic action that you want processed, then blend this with

the "dry" signal to taste. By compressing the bass and adding it back to the original, a "fatter" sound can be created.

A headphone monitoring function with an independent level adjustment is included. This is especially needed when

the unit is used as a single channel recording preamp. Its signal is picked up before the main level control, and drives a

front panel headphone jack. The main level control sets the IPro One's main balanced and unbalanced outputs. It will

adjust from "off" to +10 dB of gain. A twelve segment meter monitors either this output or the pre-amp signal, depending

on the meter switch setting. In the pre-amp position, it allows metering of the "dry" signal so that the mic or line gain can

be properly adjusted to the 0 dBu reference level. The main output has both a 1/4" unbalanced phone, and an XLR

balanced connector on the rear panel.

The unit is powered by an internal transformer, and has a standard IEC mains connector.

CONTROL FUNCTIONS:

MIC INPUT: This is a balanced (XLR) input jack designed to receive a signal from a low impedance (150 Ohm)

microphone. This connector has +48 V phantom power when the phantom power switch is on. It can handle

signal levels as high as +30 dBu (at minimum gain, pad engaged). Pin 2 is the positive input, pin 3 is the

negative input, and pin 1 is ground.

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is its dynamics section. Using state-of-the-art integrated circuits for the voltage

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Enhance process was developed. This is a