IPro One™ Intelligibility Processor
Intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. CAUTION: Risk of electrical shock — DO NOT OPEN! CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside.
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.
A key part of the IPro One™ is its dynamics section. Using state-of-the-art integrated circuits for the voltage 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).
2. 3. +48 V: Turns on the +48 V phantom power for mics that require it. Do not enable phantom power if an unbalanced low impedance mic is used, since the mic could be damaged. The LED will light if phantom power is present. POLARITY: The polarity of the mic input can be reversed in the event that the signal is out of phase with either the line or other signals. This can happen when miking the top and bottom of the soundboard of a piano, or both sides of a speaker cabinet or a drum head. 4.
include de-essing (a side-chain boost at high frequencies) to help reduce sibilance, or the removal of rumble modulation (a side-chain cut at low frequencies) which can cause pumping and breathing. It can also be set so that the compressor will only respond to certain frequencies to even out the effects of resonance that cause some notes to be much louder than others.
in recovering highs that get squashed in the compression process. Be careful of adding too much! It can get brittle and unpleasant if used in excess! 25. ENHANCE FREQUENCY: This is the tuning adjustment for the SmarTube™ Enhance effect. It can be set to generate harmonics in the range of 2 kHz to 10 kHz from the source. For most uses, this control will be set near the center of its rotation. 26. BLEND: Pans between the “dry” pre-amp signal and the fully processed “wet” signal.
IPRO ONE™ SPECIFICATIONS: Input Specifications Function Microphone 150 Ohms Input Z (Ohms) Min. Input gain setting 2.2 k Max. Gain 56 dB Min. Gain 6 dB Input Level, dBu* Min** Nom. -70 dBu -60 dBu -39 dBu -16 dBu -6 dBu (>30 dBu w/pad) Bal/ Unbal Connector Max*** Bal. XLR: Pin1 Grd Pin2 (+) Pin3 (-) Line (Hi Z) 200 k Max. Gain 20 dB -30 dBu 0 dBu +24 dBu Bal. 1/4" TRS; Ring (-) Sleeve Grd Insert Return 10 k N/A 0 dB -10 dBu 0 dBu +22 dBu Unbal.
IPRO ONE™ SPECIFICATIONS: Output Specifications Function Main Minimum Load Z (Ohms) 600 Output Level Nom. Max*** 0 dBu +22 dBu +4 dBu +26 dBu Insert Send 600 0 dBu +22 dBu Side Chain Send 600 0 dBu +22 dBu Headphone Output 8 0 dBu +22 dBu 0 dBu = 0.
Controls: Equalization: CONTROL ADJUSTMENT RANGE Low Cut Freq (XLR only) Parametric (1 and 2) Cut/Boost Parametric 1 Freq Parametric 2 Freq Bandwidth (1&2) 10 Hz to 350 Hz -24 dB to +12 dB, detent = flat 40 Hz to 4 kHz 150 Hz to 15 kHz 2 oct to 1/6 oct Dynamics: CONTROL ADJUSTMENT RANGE Expander Threshold Expander Ratio Expander Attack (to gate open) Expander Release (to gate closed) Compressor Threshold Compressor Ratio Compressor Attack Compressor Release Limiter Threshold Limiter Attack Limiter Rel
Frequency Response: Mic Input to Output: Line Input to Output: 20 Hz to 35 kHz +0 dB / -1 dB 10 Hz to 35 kHz +0 dB / -1 dB Total Harmonic Distortion plus Noise (THD + N): < 0.005% 20 Hz to 20 kHz Mic to Output (10 Hz - 80 kHz BW, dry) < 0.
DYNAMICS CONTROL SETTING PROCEDURES (EXPANDER, COMPRESSOR, LIMITER) If you are starting from scratch, or have gotten something out of whack and do not know exactly what to adjust, begin by setting the controls so that all functions are disabled. Here are the control positions for this: EX THRESH: EX RATIO: COMP THRESH: COMP RATIO: LIMIT: CMP GAIN: min min max min max min (off) (1:1) (+20 dB) (1:1) (+22) (0 dB) Naturally, the controls that need to be adjusted will depend on what you want accomplished.
PRACTICAL APPLICATIONS There are many uses for the IPro One™, limited only by your imagination. Here are some suggested uses to inspire your creative talents. The main ingredient is the IPro One’s ease of setup and use. With mic and line pre-amps, two parametric equalizers, full dynamics, SmarTube™ Enhance, and headphone outputs all connected and in one place, there is nothing easier to use.
SETTING UP A DE-ESSER: The human voice has a lot of sibilance. The high frequency content of certain consonants can quickly overload a system with harshness. To help reduce this problem, the compressor can be configured as a de-esser, or a compressor that primarily responds to high frequencies. When the offending “SSSS” is detected, the gain is automatically reduced to lessen its effect, leaving a more pleasing voice. Setup is very easy. 1. 2. 3. 4. 5. Begin with all the functions off.
CREST AUDIO LIMITED WARRANTY Effective Date: November 1, 2000 What This Warranty Covers Your Crest Audio Warranty covers defects in material and workmanship in Crest Audio products purchased and serviced in the U.S.A.
IMPORTANT SAFETY INSTRUCTIONS WARNING: When using electric products, basic cautions should always be followed, including the following: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Read all safety and operating instructions before using this product. All safety and operating instructions should be retained for future reference. Obey all cautions in the operating instructions and on the back of the unit. All operating instructions should be followed.
