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Privacy Policy Terms of Use. Recording Monitors Headphones View Accessories. Company Info Careers. Customer Help Knowledge Base. Features an explanation of digital audio recording concepts, troubleshooting, maintenance and service information, specifications, a Glossary and an Index. When something important appears in the manual, an icon like the one on the left appears in the left margin.
This symbol indicates that this information is vital when operating the LX The shipping carton was designed to protect the unit during shipping. Please retain this container in the highly unlikely event that you need to return the LX20 for servicing. Register your purchase so that you may be informed of upgrades.
If you have not already filled out your warranty card and mailed it back to Alesis, please do so now. You can mount the LX20 in an equipment rack taking up 3 rack spaces or place it on a table or shelf. When you install it, note that heat is the major enemy of electronic equipment. Please observe the following:. These are not absolute limits, but Alesis cannot guarantee that the LX20 will meet its published specs or remain reliable if operated outside of these ranges.
Do not seal any enclosure that holds the LX It is not necessary to leave an empty rack space above or below the LX20 unless it runs hot enough to affect equipment above or below it. If your environment is unusually warm and not air conditioned, space between units will help the units run cooler and may lessen tape oxide shedding. The LX20 should not be angled back or mounted vertically. Like all tape machines, the LX20 uses magnetic tape that can be sensitive to electromagnetic interference.
Generally this is not a problem, but avoid mounting the LX20 next to devices that generate strong magnetic fields such as power amplifiers, monitors and video display devices, speakers, etc. This eliminates the need for transformers or voltage switches. Your LX20 was supplied with the correct power cord for your country or local area, however only the following alternative power cords are approved for use with ADAT:. Unfortunately, the presence of a third ground pin does not always indicate that an outlet is properly grounded.
Use an AC line tester to determine this. If the outlet is not grounded, consult with a licensed electrician. Alesis cannot be responsible for problems caused by using the LX20 or any associated equipment with improper AC wiring.
One path goes from device A to ground via the ground terminal of the threeconductor AC power cord, but A also sees a path to ground through the shielded cable and AC ground of device B. Because ground wires have a small amount of resistance, small amounts of current can flow through ground and generate a voltage along the cable shield. This signal may end up getting induced into the hot conductor. The loop can also act like an antenna into which hum is induced, or can even pick up radio frequencies.
Furthermore, many components in a circuit connect to ground. Ground loops cause the most problems with high-gain circuits, since massive amplification of even a tiny bit of noise can give an audible signal. Most ground loop problems can be solved by plugging all equipment into the same grounded AC source.
However, it is important to make sure that the AC source is not overloaded and is properly rated to handle the gear plugged into it. For really tough cases, you may need to break the connection that causes the loop condition.
If your circuits are balanced, one way to do this is to simply break the shield of the shielded audio cable at some point, usually by disconnecting it from ground at one jack. The other end should remain connected so that the shielding properties are retained, even if there is no direct path for ground. Please note that not all hums and buzzes are caused by ground loops; your cables must be of high quality, particularly with dBV setups.
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. There are three main ways to protect against this, listed in ascending order of cost and complexity:. This is the most sophisticated option.
Intended for computer applications, a UPS allows you to complete an orderly shutdown of a computer system in the event of a power outage, and the isolation it provides from the power line minimizes all forms of interference — spikes, noise, etc. If your AC power is unstable or subject to occasional browns-outs or interruptions, use a professional power conditioner or uninterruptible power supply.
Some people who have experienced problems with ADAT operation have had those problems disappear completely after installing proper power conditioning. These should be low-capacitance shielded cables with a stranded not solid internal conductor and a low-resistance shield. Although quality cables cost more, they do make a difference. Always unplug by firmly grasping the body of the plug and pulling directly outward.
The inputs feed signals into the LX20 for recording. These inputs are compatible with low-impedance, unbalanced, dBV outputs typical of mixers, synthesizers, samplers, direct boxes, etc.
Guitar and bass require preamplification before feeding these inputs. Ground Sleeve. Tip Sleeve. With many mixing consoles, such as the Alesis Studio 24, each mixer channel has a direct output.
These can patch a channel directly to tape, bypassing most mixer circuitry. You would normally patch the direct out from channel 1 into LX20 input 1, channel 2 into LX20 input 2, etc. One important mixer characteristic is the number of output busses. Each output bus represents a mix of input faders, auxiliary sends, etc. Use bus connections when the mixer performs grouping, premixing, effects, etc.
The LX20 can be optimized to work with 2 bus, 4 bus, or 8 bus mixers, as described later. You would hook these up as follows. For example, with an 8-bus mixer, you would normally patch output bus 1 to LX20 input 1, output bus 2 to LX20 input 2, etc. Some situations require a combination of the two approaches. Example: Consider a live gig where you want to record two vocal mics, four mics on drums, two direct feeds from guitar and bass amps, and one direct feed from keyboards.
The vocals, bass, guitar, and keyboards could be taken direct and go to five LX20 tracks. The four drum mics can be mixed to stereo within your mixer sent to the submix outs, then go to two LX20 tracks.
The remaining LX20 track could be used to record audience sounds or capture one of the instruments in stereo, if applicable. The dBV outputs use phono jacks, and carry signals at a nominal dBV level. You would normally connect output 1 to mixer line input 1 or tape return 1, output 2 to mixer line input 2 or tape return 2, etc. Synchronization requires a male-to-male, 9-pin D connector cable for each additional machine in the chain.
These cables are available in various lengths from Alesis or your dealer and should be Alesis-approved; improper cables such as those used for computers may not function correctly. In such a system, you are basically treating all connected machines as though they were a large multitrack unit.
This powerful feature allows you to transfer digital audio between multiple ADAT-compatible devices.
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