Crest Audio IPRO TWO User manual

SERIES
Features Description
• Stereo line and two mic inputs w/pan
• Mic includes polarity switch, +48V phantom power, 20dB 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 w/track input
• 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™Two is a stereo 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 micro-
phone or line instrument since it has functions not found
in other analog signal processors.
The IPro Two has separate mic and line inputs. Each
line input has level control. Each mic input has polarity,
20dB pad, +48V 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 is a true RMS summed,
stereo link dynamic section. Controls are an on/off
switch, external side change enable, expander with
ratio and threshold controls, and compressor with ratio
and threshold controls.There is also a makeup gain and
limiter threshold.
SmarTube™enhancer has adjustable frequency and
amount. This adds tube-like characteristics to the sig-
nal. The main section has a dry/wet blend control and a
main output level control.
There is an independent headphone out with level con-
trol, with track input and level for personal monitoring.
The metering section has gain reduction dB and stereo
output level dB with the output switchable to preamp in.
IProTM Two
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 175 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) 75 Hz @ 18 dB per octave (switch)
Parametric (1&2) Cut/Boost -15dB to +15 dB, detent = flat
Parametric 1 Freq 40Hz to 15kHz
Parametric 2 Freq 40Hz to 15kHz
Bandwidth (1&2) 2 oct to 1/6 oct

Specifications IProTM Two
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA
TEL: [phone] FAX: [phone]
www.crestaudio.com
*A4500014*
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 two microphone and one stereo
line input, each with rear panel jacks. Each low
impedance microphone input will be a female
XLR connector, and will have switchable 48V
phantom power (with LED indication), and 20
dB pad, and polarity switches. Mic pre-amps
will be adjustable from +10 to +56 dB of gain
by a potentiometer and have an EIN of 128
dBu @150 ohms. Two mic enable switches
(with LED indication) will be provided. The
stereo line input will be TRS balanced and high
impedance, suitable for use with an electric
guitar (200K ohms) or standard line level
inputs, and have 1/4" will have a gain adjust-
ment range from off to +20 dB. There will be
two TRS insert jacks that function for both line
and mic inputs. They are located on the rear
panel and have a front panel enable switch
with LED indication.
EQUALIZATION:
In series with each microphone preamp will be
a defeatable third order high pass filter with a
corner frequency range of 75Hz. Two fully
adjustable stereo parametric equalizers will be
provided with a –24dB to +12dB boost/cut
range and a bandwidth adjustment of 2
octaves to 1/6 octave. They will have a fre-
quency range of 40 Hz to 15 KHz. Each para-
metric will have an enable switch with LED
indication. The second 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 jack’s return).
DYNAMICS:
The IPro Two will have an adjustable dynamics
section that will have a linked stereo compres-
sor, expande, and limiter. 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 make-up 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 indicate for
all three dynamic functions. There will be two
side-chain TRS insert jacks at the rear with a
front panel enable switch with yellow LED. The
side-chain inserts will be connected before the
second 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 Two 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 1/4"
unbalanced and a XLR balanced jacks, 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: 15Hz to 45KHz +0dB / -1dB
Line Input to Output: 10Hz to 35KHz +0dB / -1dB
< 0.01% 20Hz to 20KHz Mic to Output (10Hz - 80KHz BW, dry)
< 0.02% 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
8.7 lbs
DOM: 120VAC 60Hz 15 Watts Nominal
EXP: 230VAC 50/60Hz 15 Watts Nominal