User manual APOGEE TRAK2

[. . . ] Trak2 2-channel mic preamplifier with 44. 1/48/88. 2/96 kHz sampling 24-bit A/D Converter Owner's Manual and UV22HR® License Agreement v2. 1 ­ March 2002 Trak2 User's Guide This manual was written by Julio Alvarez and Joe Raia, with additional material and illustrations by Roger Robindoré, Jim Keller and Richard Elen. SoftLimit and UV22HR are Registered Trademarks, and Soft Saturate is a Trademark, of Apogee Electronics Corporation. Technology within the Trak2 may be covered by one or more patents that are the property of Apogee Electronics Corporation. Registered User Customer Support: For customer support, please call (310) 915-1000 and ask for Tech Support, or email support@apogeedigital. com. [. . . ] · Rotate the data wheel to select the desired filter frequency or the off position. Phase (polarity) This field allows you to reverse the polarity for the microphone preamps only in much the same way a typical console functions in that reversing the polarity on a microphone input only affects that mic input and does not affect the rest of the inputs and outputs. Reversing the polarity for the mic preamps does not affect the overall pin 2/pin 3 phase settings for the line inputs and main outputs. · Highlight the phase field for the desired channel using the cursor keys. · Rotate the data wheel to select FLIP (polarity-reversed) or NORMAL (not polarity-reversed). The front panel "" LED will illuminate to indicate phase reversal. Phantom Power (+48V) Phantom power can be applied to power condenser microphones (read your microphone's operating instructions for phantom power guidelines). Be careful not to apply phantom power to microphones that don't require it (especially ribbon microphones) as they can be damaged. To turn on phantom power: Page 22 Trak2 User's Guide · · Highlight the "+48V" field for the desired channel. Rotate the data wheel clockwise to turn on or counterclockwise to turn off phantom power. Mic Protect The Trak2 has a built-in feature to protect microphones (MICROPHONE PREAMPLIFIER/ ADVANCED MIC PRE SETTINGS) from accidental exposure to phantom power. When turned on from the Advanced menu, disconnecting a microphone from either the front or back panel inputs will turn off phantom power to prevent damage when reconnecting a microphone that does not require it. To turn it off: · Highlight the "ADVANCED" field in the "MICROPHONE PREAMPLIFIER" page and press the data wheel to enter the advanced setting page. · Turn the feature ON or OFF in the "MIC PROTECT" field · Highlight EXIT and press the button to return to the Microphone Preamplifier settings page. Mute The microphone preamplifier can be muted internally from this field. This is a "soft mute" which ramps down to infinity over 1024 samples so that there are no clicks or pops when muting. · Highlight the MUTE field for the desired channel using the cursor keys. · Rotate the data wheel to "MUTED" or "UNMUTED". Advanced Mic Pre Menu At the bottom of the microphone preamplifier page is the ADVANCED menu selection. Clicking on this field will take you to the ADVANCED MIC-PRE SETTING page that has additional features. Gain Step Size This field allows you to set the size of the microphone gain steps for each detented turn of the data wheel. Mic Protect (also see above) This field allows you to turn on or off the microphone protection feature, which protects microphones (especially ribbon mics) from accidental exposure to phantom power. When ON, disconnecting a microphone from either the front or back panel inputs will turn off phantom power. When a new microphone is connected, phantom power is OFF and will remain OFF until it is re-engaged manually. [. . . ] D/A The Digital to Analog converter is an integrated circuit "chip" that reconstructs an analog audio signal from the digital data fed at its input. Finished products that contain D/A converter chips and are used primarily for D/A conversion (such as the Apogee DA-1000E-20) are also often called "D/A converters" for short. Dither A process by which specially-generated low-level noise is added to the audio stream when taking a digital audio signal from a higher resolution to a lower resolution, or when a digital signal processing operation is performed. Dither helps eliminate digital truncation distortion and extend dynamic range. [. . . ]