CHANNEL™ MASTER PREAMP & INPUT PROCESSOR THE COMPLETE CHANNEL STRIP FOR VOICE AND INSTRUMENTS Owner’s Manual
SAFETY DECLARATIONS CAUTION: For continued protection against risk of fire, replace only with the same type and rating of fuse. ATTENTION: pour une protection continue contre les risques d’incendie, ne remplacer qu’avec la même valeur et même type de fusible. WARNING: Do not place objects containing liquid on this unit as it is not designed to protect against spillage. Do not expose this unit to dripping or splashing of liquids as the unit is not designed to protect against these occurances.
TABLE OF CONTENTS 1.0 CONTROLS & INDICATORS 2.0 INSTALLATION AND INTERFACING 2.1 Installation 2.2 AC Line Connection 2.3 Mic Input Connections 2.4 Insert Jacks 2.5 Output Connections 2.6 Digital Audio Outputs 2.7 Word Clock 2.7.1 INT/EXT 2.7.2 WC IN 2.7.3 WC OUT 2.7.4 Local Clock Mastering 2.8 Power Supply 2.9 Cough Switch 3.0 USING THE CHANNEL 3.1 Using the Mic Input 3.2 Using the Instrument Input 3.3 Using Phantom Power 3.4 Using the Polarity Switch 3.5 Using the Pad 3.6 Using the Low Cut 3.
1.0 CONTROLS AND INDICATORS POWER INDICATION The Aphex logo above the power switch glows yellow during the tube preamp’s warm-up time and green when the unit is ready. LOW NOISE MIC PRE The Channel works with all professional microphones. The clean and stable 48V phantom supply is suitable for even the most expensive microphones. The 12dB/octave low cut filter starts at 70Hz to effectively reduce wind blast without diminishing voice body.
REAR PANEL ANALOG CONNECTIONS BALANCED TRS MIC INPUT Works with all standard microphones, phantom powered or passive. Phantom power activated from front panel. +4dBu Balanced XLR Output Line Level Processor, i.e., Compressor, EQ -10dBV/+4dBu switchable TRS Output COUGH SWITCH Allows you to silently mute the output on the fly using a handheld, desktop, or floor switch.
2.0 INSTALLATION & INTERFACING 2.1 INSTALLATION The Channel occupies a single rack space (45mm or 1-3/4 inches) of a standard EIA equipment rack. When rack mounting, use appropriate cushioned rack screws. Never restrict air flow through the device’s vents. When installing the units into a rack, distribute the units evenly. Otherwise, hazardous conditions may be created by an uneven weight distribution. Connect the unit only to a properly rated supply circuit.
2.5 OUTPUT CONNECTORS There are two output connectors located on the rear panel: one 1/4” TRS phone type and one XLR-3M type. They can be used at the same time to feed separate equipment. The output level at the XLR is +4dBu impedance balanced, while the TRS balanced/unbalanced jack is switchable between -10dBV (consumer level) and +4dBU (professional level). If you intend to make an unbalanced output from the XLR jack, simply take “hot” from pin 2 and use pin 1 for ground.
3.0 USING THE CHANNEL FRONT PANEL VIEW 3.1 USING THE MICROPHONE INPUT The Channel is perfect for all types of microphones, either powered or not. We encourage you to try every mic you own with the Channel. Many features of the Channel are standard with all professional preamps - polarity - pad - etc. Some features are unique and we hope you will fully exploit them. 3.2 USING THE INSTRUMENT INPUT The Channel can also be used as a high quality direct box.
Distance to Mic2 Distance to Mic1 = Sound Cancelled Figure 4-2 Phase Cancellation Effect 3.5 USING THE PAD An input pad is nothing more than a resistive attenuator that drops the level coming from the input. Its purpose is to give you a way of preventing overload of the preamp when incoming signals become excessive. In the Channel, we provided a pad of 20dB. That means when the pad is on, the net gain of the preamp is 20dB lower.
If you want complete silence between phrases, then use the maximum depth. However, if you simply want to bring down ambience pickup as with multiple open mics in a room, then use minimal depth. The Gating LED is triggered when the audio signal is below the Threshold. If the Threshold is turned all the way up, the LED may never light. If the Depth is turned all the way counter clockwise no gating will occur.
4.0 WARRANTY & SERVICE 4.1 LIMITED WARRANTY PERIOD One year from date of original purchase. SCOPE All defects in materials and workmanship. The following are not covered: Voltage conversions , units on which the serial number has been defaced, modified or removed.
5.0 SPECIFICATIONS 5.
5.2 ARCHITECTURAL SPECIFICATIONS BASIC DESCRIPTION A single channel processor comprising microphone and instrument inputs, transformerless tube microphone preamp, a dynamics processing section and a tone controlling section, in that order. An insertion path shall be provided between the dynamics processing section and the tone controlling section. The microphone preamp shall comprise the following selectable functions: 1.) +48VDC Phantom Power; 2.) Polarity Reversal; 3.) Selectable 20dB Pad; 4.
This product is protected under one or more of the following Aphex patents. 4578648, 4633501, 4843626, 4939471, 5115471, 5155769, 5334947, 5359665, 5422602, 5424488, 5450034 5463695, 5483600, 5485077, 5612612, 5737432, 5848167, 5896458, 5898395, 5930374, 6266423 3500 N San Fernando Blvd. Burbank, CA 91505 USA PH: 818.767.2929 FAX: 818.767.2641 www.APHEX.
