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
