User manual APOGEE MINI ME

[. . . ] 2-channel portable 44. 1/48/88. 2/96 kHz sampling 24-bit A/D Converter with mic/instrument preamp Owner's Manual and UV22HR® License Agreement v1. 0 ­ Sept 2002 Mini·Me User's Guide Table of Contents Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Registration & Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Service Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Declarations of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Licensing & Legal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Owner's record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 User's Installation Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 The Manual Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Introducing the Mini·Me. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Front Panel Features Back Panel Features Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Detailed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Analog Input Selector Line Input Microphone Input Instrument Input Metering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Sample Rate and Resolution Selector USB Input and Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Operating System and ASIO Driver Support Operating Systems currently supported Macintosh OS 9. x USB Audio with Sound Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 USB Audio with ASIO Driver Macintosh OS X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Windows 98SE, Me, 2000 and XP Soft Limit and Push-IT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Using Soft Limit and Push-IT circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Applying the UV22HR Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 AES/EBU S/PDIF USB Audio Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Headphone Out Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Adjusting Push-It Adjusting the Microphone Preamp Gain Structure Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Page 3 Mini·Me User's Guide This manual was written by Jim Keller and revised by Richard Elen. SoftLimit and UV22HR are Registered Trademarks, and Push-IT is a Trademark, of Apogee Electronics Corporation. All other trademarks are property of their respective holders. Technology within the Mini-Me may be covered by one or more patents that are the property of Apogee Electronics Corporation. [. . . ] This will provide quick level adjustment and not alter the level/calibration of the line inputs. Page 14 Mini·Me User's Guide *Note: When sending a line input into the Mini·Me, it is important not to use the 1/4 in inputs, as these inputs have additional gain, as is required for instrument inputs such as guitars or keyboards. If your source for line input is 1/4 inch, we suggest a 1/4 in to XLR cable to enable proper connection to the Mini·Me. Metering The front panel metering LEDs indicate the level of the input signal after A/D conversion. The numbers by each LED (-40, -12, and -2) represent the digital headroom in units in what is referred to as digital full-scale (dBFs). To get a clear picture of how digital levels relate to analog levels, see the figure below. The red "over" LED's will illuminate when three consecutive full-scale samples are output by the A/D converter chip. Sample Rate and Resolution Selector The Mini·Me is capable of sample rates of 44. 1 kHz, 48 kHz, 88. 2 kHz and 96 kHz. All of these sample rates are available at 24-bit resolution. At sample rates of 44. 1 kHz and 48 kHz, the 24-bit word length may reduced down to 16- or 20-bit resolution via Apogee's UV22HR dithering algorithm. The unit also features digital black settings at all four sample rates. Choosing one of these settings will supply sync information only on all digital outputs. No digital audio will be output from the Mini·Me in these modes. To choose a sample rate/resolution combination, use the "Sample Rate" knob on the front panel. This knob has twelve positions, each of which stops at positions similar to the hours on a clock. Sample rates are silkscreened in black, while the resolution has a colored background silk-screen. Examples: · · · If you need to record with a 44. 1 kHz sample rate and 16-bit resolution, then set the "Sample Rate" knob to the one o'clock position. If you need to record with a 88. 2 kHz sample rate and 24-bit resolution, then set the "Sample Rate" knob to the ten o'clock position. To use the Mini·Me as a clock source only for 48 kHz recording, set the "Sample Rate" knob to the six o'clock position for 48 kHz digital black. Page 15 Mini·Me User's Guide USB Input & Output The Mini·Me offers USB Audio digital I/O for use with computer operating systems that support USB Audio devices. The audio can be handled in the operating system in different ways. Refer to your platform and OS below for detailed information on setup options for the Mini·Me. The Mini·Me also offers a unique feature that enables the unit to run at a different sample rate and bit depth than the computer recording software. The USB Audio I/O section of the Mini·Me follows the sample rate and resolution settings on the computer, while the AES and S/PDIF outputs follow the settings of the "sample rate" knob on the front panel. For example, this can be used to send a 16-bit/44. 1 kHz signal out of the AES output to a CD burner while simultaneously sending a 24-bit/48 kHz signal out of the USB Audio port to the computer. In this case, the analog inputs are converted at 44. 1 kHz and sent through UV22HR, to dither the AES and S/PDIF outputs to 16bit. The USB Audio section receives the 44. 1 kHz signal before the dithering process, where it is still a 24-bit signal. [. . . ] There are two small trim pots on the main circuit board in positions R165 and R166 (see picture below for detail of location). You'll notice that R166 is labeled "Preset 2" and R165 is labeled "Preset 3". The "Preset 2" trim pot adjusts the settings for curve "2" compressor circuit while the "Preset 3" trim pot adjusts the settings for curve "3". With these trim pots, you can adjust the ratio from 1:1 to 1:3. Each trim pot has the same range; the difference between the two compressors is in the time constant. [. . . ]