Crest Audio IPRO ONE User manual

SERIES
Features Description
• Mic/line inputs on front and rear of unit
• Mic includes polarity switch, +48 V phantom
power, 20 dB pad
• Two full featured parametric EQ's
• Full featured expander/compressor/limiter
• Solid-state, tube-sound processor (SmarTube)
• Switchable I/O LED metering
• Independent headphone out
• Multicolor LED meters
• Balanced and unbalanced I/O
• Internal power supply
Applications
•Recording processor (channel strip)
•Location broadcasting
•Ducking
•De-essing
•Monitor or main mix enhancement
•In ear monitor processor
•60 cycle hum removal
•Vocal and instrument enhancement
•Dynamics processor
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 applica-
tions. 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 ana-
log signal processors.
The IPro One has separate mic and line inputs. The line
input has level control. The mic input has polarity, 20 dB
pad, +48 V phantom power, on/off switch, and an
adjustable low cut filter with gain control.
The parametrics section have two adjustable EQ's. Both
have on/off switches, and the second has a switch to
side change into the dynamics section.
The compand/limit section has an on/off switch, external
side change enable, expander with ratio and threshold
controls, and compressor with Ratio and Threshold con-
trols. there is also a makeup gain and limiter threshold.
SmarTube™enhancer has adjustable frequiproency and
amount. This adds tube-like characteristics to the signal.
The Main Section has a dry/wet blend control and a
main output level control. There is an independent
headphone out with level control.
The metering section has gain reduction dB and output
level dB with the output switchable to preamp in.
IProTM One
Dynamics:
CONTROL ADJUSTMENT RANGE
Expander Threshold <-80 dBu to +10 dBu
Expander Ratio 1:1 (off) to 1:5 (gate)
Expander Attack (to gate open) 2 msec (fixed)
Expander Release (to gate closed) 175 msec (fixed)
Compressor Threshold -40 dBu to +20 dBu
Compressor Ratio 1:1 (off) to infinite:1 (limit)
Compressor Attack 5 msec (fixed)
Compressor Release 200 msec (fixed)
Limiter Threshold 0 dBu to +22 dBu
Limiter Attack 5 msec (fixed)
Limiter Release 175 msec (fixed)
Makeup Gain 0 dB to +20 dB
Equalization:
Low Cut Freq (XLR only) 10 Hz to 350 Hz
Parametric (1&2) Cut/Boost -24 dB to +12 dB, detent = flat
Parametric 1 Freq 40 Hz to 4K Hz
Parametric 2 Freq 150 Hz to 15K Hz
Bandwidth (1&2) 2 oct to 1/6 oct

Specifications IProTM One
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA
TEL: [phone] FAX: [phone]
www.crestaudio.com
*A4500013*
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
9/4/01
v.1.5
Architects’ & Engineers’ Specifications:
INPUTS:
There will be one microphone and one line
input, each with a front and a rear panel jack
connected in parallel. The low impedance
microphone input will be a female XLR con-
nector, and will have switchable 48V phantom
power (with LED indication), and 20 dB pad,
and polarity switches. Its pre-amp will be
adjustable from +10 to +56 dB of gain by a
potentiometer and have an EIN of 128 dBu
@150 ohms. A mic enable switch (also with
LED indication) will be provided. The line input
will be TRS balanced and high impedance,
suitable for use with an electric guitar (200K
ohms), and have 1/4" jacks. It will have a gain
adjustment range from off to +20 dB. There will
be a TRS insert jack that functions for both
inputs on the rear panel with a front panel
enable switch with LED indication.
EQUALIZATION:
In series with the microphone pre-amp only will
be an adjustable second order high pass filter
with a corner frequency range of 10 Hz to 350
Hz. Two fully adjustable parametric equalizers
will be provided with a –24dB to +12dB
boost/cut range and a bandwidth adjustment of
2 octaves to 1/6 octave. The low band will have
a frequency range of 40 Hz to 4 KHz, the high
band will have a frequency adjust range of 150
Hz to 15 KHz. Each parametric will have an
enable switch with LED indication. The high
band parametric filter will additionally have a
switch that will move its position out of the main
audio path and into the compressor’s side-
chain (after the side-chain insert jacks return).
DYNAMICS:
The IPro One will have an adjustable dynamics
section that will have a compressor, an
expander, and a limit function. The expander
will have threshold (-80 dBu to +10 dBu) and
ratio (1:1 to 1:5) controls. The compressor will
have threshold (-40 dBu to +20 dBu), ratio (1:1
to infinite:1), and makeup gain (0 dB to +20
dB) controls. Both will be soft knee circuitry.
The limit will have only a threshold (0 dBu to
+22 dBu) control with a red "active" LED. A
twelve step gain reduction LED array will indi-
cate for all three dynamic functions. There will
be a side-chain TRS insert jack at the rear with
a front panel enable switch with yellow LED.
The side-chain insert will be connected before
the high band parametric EQ when it is
switched into the detector path so that external
signals may benefit from it.
There will be a dynamics enable switch (with
green LED) on the front panel which allows all
dynamics functions to be bypassed.
SMARTUBE:
Included in the IPro One is a high frequency
enhancement circuit that adds transtube har-
monics to improve definition and add presence
to the signal. There will be a tuning control with
an adjustment range of 2kHz to 10kHz, and a
level control.
OUTPUTS:
There shall be a master output level control
with a gain range of OFF to +10dB.
Independent of this control will be a head-
phone level control with the same gain range,
and a front panel headphone jack. A blend
control will pan between the dry preamp signal
and the wet post processing signal to allow a
compressed frequency shaped signal to be
blended with the original input to fatten the
bass or add a high frequency sheen. A twelve
segment LED output meter array will be includ-
ed. It will monitor either the pre-amp signal (to
assist in setting the mic input gain or line level),
or the main output, determined by a selector
switch. The output jacks will consist of a 1/4"
unbalanced and an XLR balanced jack on the
rear panel. The mains input will be an IEC con-
nector.
Frequency Response:
Total Harmonic Distortion plus Noise (THD+ N):
Signal to Noise (all functions enabled, all levels at
nominal, mic input at min gain):
MIC Equivalent Input Noise (EIN):
Common Mode Rejection Ratio (Mic Input):
Meters:
Dimensions:
Weight:
Power Requirements:
Mic Input to Output: 20Hz to 35KHz +0dB / -1dB
Line Input to Output: 10Hz to 35KHz +0dB / -1dB
< 0.005% 20Hz to 20KHz Mic to Output (10Hz - 80KHz BW, dry)
< 0.03% 20Hz to 20KHz Mic to Output (10Hz - 80KHz BW, dynamics enabled)
88 dBu
-129 dBu (Input terminated with 150 Ohms)
77dB typ @ 1kHz, max gain
12 segment gain reduction indication
12 segment peak reading output (0dB = 0dBu @ 1/4" out, +4dBu @ XLR out)
19" W x 9.5" D x 3.5" H
8.5 lbs
DOM: 120VAC 60Hz 15 Watts Nominal
EXP: 230VAC 50/60Hz 15 Watts Nominal