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A L ES I S ADAT LX20 Reference M a nu a l.
Contents ADAT LX20 Reference Manual 1 C ONTENTS Introduction 5 How To Use This Manual 6 Conventions 6 1 S ETTING U P AND M AKING C ONNECTIONS 7 Unpacking and Inspection 7 Operating Environment 7 Therm.
Contents 2 ADAT LX20 Reference Manual What is Tape Formatting? 2 4 3 P OWER -U P AND T APE F ORMATTING 26 Power-up and Tape Insertion 2 6 Setting Tape Length 2 7 How to Format Tapes 2 8 About Type I a.
Contents ADAT LX20 Reference Manual 3 Manual Punching Options 4 5 Transport Controls 4 5 Record Enable Buttons 4 5 Footswitch 4 6 Automated Recording 4 6 Looped Recording 4 7 Rehearsing 4 7 Adjusting .
Contents 4 ADAT LX20 Reference Manual Live/Long-Term Recording 6 6 Locking to Video: Code-Only Master 6 6 Libraries and Archives 6 7 Modular Recording 6 7 Computer Control and MIDI 6 7 MIDI Systems: V.
Introduction ADAT LX20 Reference Manual 5 I NTRODUCTION Thank you for purchasing the Alesis ADAT-LX20 20-Bit Digital Audio Recorder. To take full advantage of the LX20’s functions, and to enjoy long and trouble-free use, please read this manual carefully.
Introduction 6 ADAT LX20 Reference Manual H OW T O U SE T HIS M ANUAL Though we recommend you read through the entire manual once, those having general knowledge about multitrack recorders should use the table of contents and index to reference specific functions while using the LX20.
Chapter 1 - Setting Up and Making Connections ADAT LX20 Reference Manual 7 C HAPTER 1 S ETTING U P AND M AKING C ONNECTIONS U NPACKING AND I NSPECTION Your ADAT-LX20 was packed carefully at the factory. The shipping carton was designed to protect the unit during shipping.
Setting Up and Making Connections - Chapter 1 8 ADAT LX20 Reference Manual M OUNTING ON A S HELF OR N ON -R ACK E NCLOSURE To mount the LX20 on a shelf or other flat surface, Alesis recommends attaching stick-on rubber feet to avoid scratching the shelf’s surface with the deck’s bottom.
Chapter 1 - Setting Up and Making Connections ADAT LX20 Reference Manual 9 A VOIDING G ROUND L OOPS In today’s studio, there are many opportunities for ground loop problems to occur. These show up as hums, buzzes, or sometimes radio reception, and can occur if a piece of equipment “sees” two or more different paths to ground, as shown below.
Setting Up and Making Connections - Chapter 1 10 ADAT LX20 Reference Manual L INE C ONDITIONERS AND P ROTECTORS Although the LX20 can tolerate typical voltage variations, the AC line voltage may contain spikes or transients that can possibly stress your gear and, over time, cause a failure.
Chapter 1 - Setting Up and Making Connections ADAT LX20 Reference Manual 11 A NALOG A UDIO C ONNECTIONS A BOUT A UDIO C ABLES The connections between the LX20 and your studio are your music’s lifeline, so use only high quality cables.
Setting Up and Making Connections - Chapter 1 12 ADAT LX20 Reference Manual Here’s how the input jacks and plugs are wired: Tip Signal Sleeve Ground Tip Sleeve T YPICAL INPUT JACK HOOKUPS You typically patch the following into the inputs: • Console direct tape outs.
Chapter 1 - Setting Up and Making Connections ADAT LX20 Reference Manual 13 O UTPUTS The -10 dBV outputs use phono jacks, and carry signals at a nominal -10 dBV level.
Setting Up and Making Connections - Chapter 1 14 ADAT LX20 Reference Manual S YNC I N /O UT The two rear panel DB-9 connectors marked SYNC IN and SYNC OUT synchronize two or more ADAT-family devices, .
Chapter 1 - Setting Up and Making Connections ADAT LX20 Reference Manual 15 D IGITAL A UDIO C ONNECTIONS The digital input and output carries all eight tracks on a single fiber optical cable (called the ADAT Optical Interface, and sometimes nicknamed the ADAT “Light Pipe”).
Setting Up and Making Connections - Chapter 1 16 ADAT LX20 Reference Manual ➃ For each additional machine, connect one end of an additional fiber optic cable to the second machine’s DIGITAL OUT jack, and the other end to the third machine’s DIGITAL IN jack.
Chapter 1 - Setting Up and Making Connections ADAT LX20 Reference Manual 17.
Setting Up and Making Connections - Chapter 1 18 ADAT LX20 Reference Manual There are three ways to use this jack. • Footswitch only. Plug a momentary, single-pole/single-throw footswitch (either normally open or normally closed) halfway into the jack so that the footswitch plug tip connects to the jack ring connection.
Chapter 1 - Setting Up and Making Connections ADAT LX20 Reference Manual 19.
LX20 Essentials - Chapter 2 20 ADAT LX20 Reference Manual C HAPTER 2 LX20 E SSENTIALS A BOUT T HE D ISPLAY The LX20’s display shows the current level of each of the eight audio tracks, the tape position (in hours, minutes, seconds, and 100ths of seconds or frames), and the current modes of the many available parameters.
Chapter 2 - LX20 Essentials ADAT LX20 Reference Manual 21 B LOCKS There are three ”blocks” located in the lower right-hand corner: Clock, Input Mon, and Input. Each block shows the selected option for the block’s parameter. S TATUS I NDICATORS These are individual status indicators.
LX20 Essentials - Chapter 2 22 ADAT LX20 Reference Manual I NPUT S ELECT B UTTONS These determine how signals, both analog and digital, are routed to the LX20. P ITCH C ONTROL B UTTONS These increase or slow down the playback and record speeds to change pitch.
Chapter 2 - LX20 Essentials ADAT LX20 Reference Manual 23 D IFFERENCES C OMPARED TO A NALOG R ECORDING Recording on the LX20 is very similar to most multitrack tape machines.
LX20 Essentials - Chapter 2 24 ADAT LX20 Reference Manual C HOOSING THE R IGHT S-VHS C ASSETTE T APE We cannot overemphasize the importance of using only premium quality, name brand S-VHS cassettes such as Quantegy 489 DM Digital Mastering Audio Tape, or Alesis ADAT Mastering Audio Cassettes.
Chapter 2 - LX20 Essentials ADAT LX20 Reference Manual 25.
Power-Up and Tape Formatting - Chapter 3 26 ADAT LX20 Reference Manual C HAPTER 3 P OWER -U P AND T APE F ORMATTING P OWER - UP AND T APE I NSERTION Patch the LX20’s power cord between the rear panel, three-prong power socket and a properly-wired AC outlet receptacle.
Chapter 3 - Power-Up and Tape Formatting ADAT LX20 Reference Manual 27 S ETTING T APE L ENGTH The LX20 can use tapes longer than the standard ST-120 length (an ST-180 tape gives over one hour of recording time, an ST-160 gives 53 minutes).
Power-Up and Tape Formatting - Chapter 3 28 ADAT LX20 Reference Manual H OW TO F ORMAT T APES What it does: Formatting an LX20 tape “time-stamps” the tape every 1/48,000 of a second (at a 48 kHz sample rate), and stores reference information about the tape in a data header at the tape’s beginning.
Chapter 3 - Power-Up and Tape Formatting ADAT LX20 Reference Manual 29 G ENERAL F ORMATTING P ROCEDURE Formatting consists of inserting the tape, selecting the sample rate, selecting the audio resolution, then initiating formatting. Following are the steps needed to format a tape.
Power-Up and Tape Formatting - Chapter 3 30 ADAT LX20 Reference Manual.
Chapter 3 - Power-Up and Tape Formatting ADAT LX20 Reference Manual 31 R ECORDING W HILE F ORMATTING To record onto tape while formatting, before pressing the FORMAT button press the RECORD ENABLE button(s) 1–8 associated with the track(s) to be recorded.
Power-Up and Tape Formatting - Chapter 3 32 ADAT LX20 Reference Manual.
Chapter 4 - Record and Playback Basics ADAT LX20 Reference Manual 33 C HAPTER 4 R ECORD AND P LAYBACK B ASICS U NDERSTANDING THE T IME C OUNTER Before recording, familiarize yourself with the TIME counter in the display’s top left corner. This counter shows the time reference “stamped” on a formatted tape as hours:minutes: seconds.
Record and Playback Basics - Chapter 4 34 ADAT LX20 Reference Manual The reason for these three modes is to take equal advantage of 2, 4 and 8 bus mixing consoles. To select the appropriate Input Mode, hold the ANALOG INPUT button and press one of the RECORD ENABLE buttons (1–8).
Chapter 4 - Record and Playback Basics ADAT LX20 Reference Manual 35 S ELECT T RACK ( S ) FOR R ECORDING A track can be in one of 3 states: • Safe The track RECORD indicator (the red bar located right below the meter) is off.
Record and Playback Basics - Chapter 4 36 ADAT LX20 Reference Manual P LAY Press to start playback from the current tape location. The PLAY button also has special functions in Record and Autolocation modes, as described in Chapter 5. The following chart summarizes all possible Play button options.
Chapter 4 - Record and Playback Basics ADAT LX20 Reference Manual 37 To end a Cue or Review operation, press PLAY, STOP, REWIND, or FFWD. S TEP -B Y -S TEP P ROCEDURES The following sections describe in detail how to record, play back, cue, and review.
Record and Playback Basics - Chapter 4 38 ADAT LX20 Reference Manual R EVIEWING AND C UEING The review and cue modes make it easy to locate a particular section of a recording. Review mode lets you play the tape in reverse 3 times faster than normal play, while hearing “fragments” of audio.
Chapter 4 - Record and Playback Basics ADAT LX20 Reference Manual 39 Record-enabled tracks monitor the… Input signal Input while recording or stopped, tape while playing Non-record-enabled tracks mo.
Record and Playback Basics - Chapter 4 40 ADAT LX20 Reference Manual.
Chapter 5 - Autolocation and Loop Functions ADAT LX20 Reference Manual 41 C HAPTER 5 A UTOLOCATION AND L OOP F UNCTIONS The LX20 lets you concentrate on making music by automating several common processes, including location, recording, and playback.
Autolocation and Loop Functions - Chapter 5 42 ADAT LX20 Reference Manual buttons. tr ansport plays, and the PLAY LED lights. To edit a Locate Point: Operation You press… You see… Initiate Locate Point editing The EDIT VALUE button The EDIT indicator appears in the display, along with one of the numbered LOCATE points below it.
Chapter 5 - Autolocation and Loop Functions ADAT LX20 Reference Manual 43 To enable Auto Return: Operation You press… You see… Store the tape position to which the LX20 should return into LOCATE 1.
Autolocation and Loop Functions - Chapter 5 44 ADAT LX20 Reference Manual L OOP L IMIT To protect against unnecessary wear and tear, the LX20 automatically disables Auto Loop after completing 100 consecutive loops. To disable this safeguard, hold the SET LOCATE button and press AUTO RETURN.
Chapter 6 - Punching and Automated Recording ADAT LX20 Reference Manual 45 C HAPTER 6 P UNCHING AND A UTOMATED R ECORDING Punching is the process of recording over a section of tape (for example, to replace a bad note in an otherwise good performance).
Punching and Automated Recording - Chapter 6 46 ADAT LX20 Reference Manual F OOTSWITCH Pressing the punch footswitch is equivalent to pressing RECORD and PLAY. If the LX20 is already recording, pressing the punch footswitch exits Record mode but the transport continues to play.
Chapter 6 - Punching and Automated Recording ADAT LX20 Reference Manual 47 If Locate 2’s position is later than Locate 3’s position, the TIME counter will temporarily read “ invALid”. Initiating record past Locate 2’s position but before Locate 3’s position starts recording immediately.
Punching and Automated Recording - Chapter 6 48 ADAT LX20 Reference Manual A DJUSTING P UNCH C ROSSFADE T IME Whenever recording begins or ends, the XT20 provides a smooth transition between the audio on tape and the audio being recorded. This prevents gaps and/or noises when punching in and out of record.
Chapter 7 - Pitch Control ADAT LX20 Reference Manual 49 C HAPTER 7 P ITCH C ONTROL The Pitch function controls the tape’s speed, which changes the pitch of the audio recorded on tape. The LX20’s Pitch control range covers -300 to +100 cents with a 48kHz sample rate, and -200 to +200 cents at 44.
Punching and Automated Recording - Chapter 6 50 ADAT LX20 Reference Manual.
Chapter 8 - About Digital Audio In/Out ADAT LX20 Reference Manual 51 C HAPTER 8 A BOUT D IGITAL A UDIO I N /O UT The ADAT Optical Interface carries 8 tracks of digital audio between ADAT compatible pr.
About Digital Audio In/Out - Chapter 8 52 ADAT LX20 Reference Manual S ELECTING T HE D IGITAL O UTPUT M ODE Many applications involve sending the LX20’s digital output to another device, such as another ADAT for backup, or the ADAT-PCR card for digital editing.
Chapter 8 - About Digital Audio In/Out ADAT LX20 Reference Manual 53 C HAPTER 9 U SING THE LX20 LRC R EMOTE The hand-held LRC remote provides the following functions: • Transport functions: Rewind, Fast Forward, Stop, Play and Record.
Using the LX20 LRC Remote - Chapter 9 54 ADAT LX20 Reference Manual.
Chapter 10 - Multiple LX20/ADAT Operation ADAT LX20 Reference Manual 55 C HAPTER 10 M ULTIPLE LX20/ADAT O PERATION O VERVIEW The LX20 can work together with up to 15 other ADAT-family machines to provide a total of 128 tracks. ADAT machines have a sync bus that provides timing information for all ADATs in a system.
Applications - Chapter 11 56 ADAT LX20 Reference Manual POWER INPUT 90-250 V 50- 60 Hz 80 W MAX LISTED 3T55 COMMERCIAL RECORDER U ® U.S. Patents 5,297,181 5,321,561 5,541,781 THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
Chapter 10 - Multiple LX20/ADAT Operation ADAT LX20 Reference Manual 57 M ASTER /S LAVE I NTERACTION Pressing any of the transport buttons (PLAY, STOP, etc.), or AUTO REC, PITCH ▲ or ▼ , LOCATE 0 – LOCATE 4, ALL INPUT, or AUTO INPUT will automatically trigger the same functions on the slave machine(s).
Applications - Chapter 11 58 ADAT LX20 Reference Manual To properly extend a format, the master and slaves should be locked before punching into format record.
Chapter 10 - Multiple LX20/ADAT Operation ADAT LX20 Reference Manual 59 track 1 going to input 1, track 2 going to input 2, etc. (however, tracks can be re- assigned to different inputs; see next section).
Applications - Chapter 11 60 ADAT LX20 Reference Manual M AKING D IGITAL B ACKUPS You can (and should!) back up LX20 tapes by copying all eight tracks to another LX20 (or ADAT-compatible machine) via the digital bus. Alesis urges you to back up whenever you have material you don’t want to lose.
Chapter 10 - Multiple LX20/ADAT Operation ADAT LX20 Reference Manual 61 put the new tape into the master, the damaged tape in the slave, and copy from the slave to the master. M AKING A 16- BIT COPY FROM A 20- BIT MASTER With over 100,000 ADAT 16-bit Type I machines in use, you may need to trade tapes with someone who owns an older machine.
Applications - Chapter 11 62 ADAT LX20 Reference Manual D IGITAL C LOCK C ONSIDERATIONS Switching between the LX20’s two internal clock sample rates (48 kHz and 44.1 kHz) changes the reference used for computing tape location. Therefore, the same tape location will appear to have two different time addresses depending on the selected sample rate.
Chapter 10 - Multiple LX20/ADAT Operation ADAT LX20 Reference Manual 63 I NPUT M ONITORING The ADAT LX20 monitors the input signals through the A/D and D/A converters at all times. This lets you hear eactly what the audio will sound like when it’s played back from tape.
Applications - Chapter 11 64 ADAT LX20 Reference Manual Here are some possible solutions: • Use a phase switch on your mixer (if your mixing board provides this) to invert the phase of a “problem track” to compensate.
Chapter 11 - Applications ADAT LX20 Reference Manual 65 C HAPTER 11 A PPLICATIONS O VERVIEW This chapter describes some typical LX20 applications. These are overviews that do not include step-by-step instructions. Therefore, you may need to refer to other sections of this manual for details on how to set up the LX20 for a particular application.
Applications - Chapter 11 66 ADAT LX20 Reference Manual Example: Suppose a guitar lick is too loud in the mix. Rewind to before the offending lick, reduce only the guitar level at the mixer, then press Play. Punch in at the point where you want the lower guitar level.
Chapter 11 - Applications ADAT LX20 Reference Manual 67 L IBRARIES AND A RCHIVES The LX20 is superb for archiving purposes, such as speeches and broadcasts, stereo mixes or libraries of stereo samples. The LX20 can record over eight hours of mono material by recording approx.
Applications - Chapter 11 68 ADAT LX20 Reference Manual Doing a premix of virtual tracks to two or more tape tracks can solve these and other problems.
Chapter 11 - Applications ADAT LX20 Reference Manual 69 To set up a system for MMC control, first lock the sequencer to the LX20’s time code; the transport commands you issue from the sequencer act like a remote control. Here’s the basic hookup: • Make sure your sequencer is receiving MTC from the LX20.
Applications - Chapter 11 70 ADAT LX20 Reference Manual T YPICAL APPLICATIONS Over 100 manufacturers support the ADAT Optical Interface. Compatible products include computer interfaces (such as the Alesis ADAT-PCR), signal processors, keyboards (Korg Trinity, Alesis QS Series), data translators, and more.
Chapter 11 - Applications ADAT LX20 Reference Manual 71 A R EAL -W ORLD E XAMPLE Suppose you did a great tape on your ADAT at home, and now want to edit it in a hard disk recording setup at a commercial studio.
Applications - Chapter 11 72 ADAT LX20 Reference Manual P RE -M ASTERING WITH THE LX20 Mastering has typically been the weak link in the project studio.
Appendix A - Digital Recording Concepts ADAT LX20 Reference Manual 73 A PPENDIX A D IGITAL R ECORDING C ONCEPTS A NALOG R ECORDING B ASICS Digital recording works very differently from analog recording. With analog recording, tape containing millions of tiny magnetizable particles move past a record head.
Digital Recording Concepts - Appendix A 74 ADAT LX20 Reference Manual A/D Analog Signal Digital Signal These numbers, which represent coded audio, are then converted into an audio signal that can be recorded on tape. Fortunately, recording a number on tape doesn’t degrade the signal.
Appendix A - Digital Recording Concepts ADAT LX20 Reference Manual 75 W HY S-VHS? S-VHS recording technology offers more than enough bandwidth to record eight tracks of digital audio. S-VHS tapes are built to higher standards than standard VHS tapes, and can take the tape shuttling required by professional audio applications.
Troubleshooting - Appendix B 76 ADAT LX20 Reference Manual A PPENDIX B T ROUBLESHOOTING R E -I NITIALIZING : T RY T HIS F IRST If your unit behaves erratically or “freezes,” do not assume you need to clean the heads or perform any type of servicing.
Appendix B - Troubleshooting ADAT LX20 Reference Manual 77 T ROUBLESHOOTING I NDEX If you experience problems while operating the LX20, please use the following table to locate possible causes and solutions before contacting Alesis customer service for assistance.
Troubleshooting - Appendix B 78 ADAT LX20 Reference Manual E RROR R ATE D ISPLAY The TIME counter has a secondary mode which, when selected, will display only the minutes and seconds of the tape position, and the error rate while the transport is engaged in play or record.
Appendix B - Troubleshooting ADAT LX20 Reference Manual 79 ADAT H EAD L IFE The expected head life for each ADAT varies according to a number of factors. Properly cared for, your heads should last for thousands of hours. If abused, they will wear out dramatically sooner.
Troubleshooting - Appendix B 80 ADAT LX20 Reference Manual ADAT H EAD M AINTENANCE The heads of each ADAT are pre-aligned at Alesis. No user adjustment is necessary. Eventually, depending on the quality of the tapes used and the environmental conditions where the ADAT and its tapes are stored, head cleaning may become necessary.
Appendix B - Troubleshooting ADAT LX20 Reference Manual 81 T APE C ARE AND M AINTENANCE ADAT tapes are no different than any standard tape: they must be treated with care. Never expose ADAT tapes to temperature extremes, strong magnetic fields (such as speakers), high humidity, dust and so on.
Troubleshooting - Appendix B 82 ADAT LX20 Reference Manual M AINTENANCE /S ERVICE C LEANING Disconnect the AC cord, then use a damp cloth to clean the LX-20’s metal and plastic surfaces. For heavy dirt, use a non-abrasive household cleaner such as Formula 409 or Fantastik.
Appendix B - Troubleshooting ADAT LX20 Reference Manual 83 O BTAINING R EPAIR S ERVICE Before contacting Alesis, check over all your connections, and make sure you’ve read the manual. Customers in the USA: If the problem persists, call Alesis USA at 1-800-5ALESIS and request the Product Support department.
Error Codes - Appendix C 84 ADAT LX20 Reference Manual A PPENDIX C E RROR C ODES The following errors codes may appear from time to time in the TIME counter display. Use this reference to learn the possible cause of the error code before attempting to contact Alesis Product Support.
Appendix C - Error Codes ADAT LX20 Reference Manual 85 Er 7 Clean Heads: If this error message is seen, it may indicate that the heads are in need of cleaning. See ADAT Head Maintenance for information about cleaning your heads. Er 8 Sync Lost: Error message 8 normally occurs when the tape reaches the end while formatting or recording.
Error Codes - Appendix C 86 ADAT LX20 Reference Manual A UTOMATIC B RAKE C ALIBRATION P ROCEDURE If the "CAL brAc" error message appears, the internal braking system of the LX20 may need to be adjusted. The intelligent transport software is capable of calibrating the LX20’s brakes automatically in a self-test procedure.
Appendix C - Error Codes ADAT LX20 Reference Manual 87 S TEPS T O T AKE B EFORE C ALLING F OR H ELP If an error message is displayed or if an ADAT starts behaving strangely, it will be helpful if you can pinpoint the problem as precisely as possible.
Specifications 88 ADAT LX20 Reference Manual S PECIFICATIONS Transport Recording Format: ADAT Rotary head digital recording Type I (16-bit) and Type II (20-bit) Tape Format: S- VHS cartridge Heads: 4 .
Specifications ADAT LX20 Reference Manual 89 Digital Inputs/Outputs Connectors: Two EIAJ fiber optical jacks (1 in, 1 out) Communications Protocol: 8 - Channel Serial Communication General Power Requi.
Glossary 90 ADAT LX20 Reference Manual G LOSSARY A A/D or Analog-to-Digital Converter The device that converts an analog audio signal to digital audio. Once encoded, all audio is stored or processed as a series of numbers rather than as the audio itself.
Glossary ADAT LX20 Reference Manual 91 called the Auto Return End point. The point that is returned to is called the Auto Return Start point..
Glossary 92 ADAT LX20 Reference Manual B Balanced Audio Signals Signals that are carried on three-conductor cables, with two of the conductors carrying the same signal 180° out of phase and third as ground.
Glossary ADAT LX20 Reference Manual 93 D DAT Digital Audio Tape. This term has come to mean specific digital audio tape recorders that use cartridges smaller than those of a standard cassette, and which record two tracks of digital audio (and sometimes timecode).
Glossary 94 ADAT LX20 Reference Manual L.
Glossary ADAT LX20 Reference Manual 95 M MIDI Musical Instrument Digital Interface (MIDI). A protocol whereby various MIDI- compatible products can communicate various musical and non-musical messages (such as notes, controls, etc.). MMC MIDI Machine Control (MMC).
Glossary 96 ADAT LX20 Reference Manual Q R Record-Ready A track mode, often called “armed.” When you want to record on a track, you “ready” or “arm” the track. When you push the record button, all tracks that are ready or armed will go into record mode.
Glossary ADAT LX20 Reference Manual 97 Similar to the AES/EBU interface, but created by Sony and Philips with consumer applications in mind. The optional AI-1 from Alesis offers both the consumer S/PDIF interface and professional AES/EBU format for use with the XT20.
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