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Summary of Contents for Audio Research LS28
- Page 1 LS28...
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Page 3: Operation
Thank you for choosing the LS28 as part of your high performance music system. Since 1970, Audio Research has been creating some of the world’s finest audio equipment. Each piece is handcrafted in Minnesota, and has been designed to provide many years of listening enjoyment. -
Page 4: Table Of Contents
Contents Warnings Installation Before Operating the LS28 In Your System A Note about Vacuum Tubes Connections Back Panel Connections Input Connectors Output Connectors Operation Record Output A.C. Power Connection Front Panel Controls and Display RS-232, IR Input and 12 V trigger... -
Page 5: Warnings
• This unit is RoHS compliant. • This unit contains voltages which can cause serious injury or death. Do not operate • The LS28 has automatic muting to help with covers removed. Refer servicing protect system components in the event to your authorized Audio Research of low line voltage. -
Page 6: Installation
Before operating the LS28 Remove all screws fastening the top cover. Your LS28 preamplifier is shipped with the Carefully remove each vacuum tube vacuum tubes packed in a separate foam- from its protective foam and match its lined carton. These must be unpacked and location ‘V’... -
Page 7: In Your System
For upright stability A Note about Vacuum Tubes and best performance, never operate The vacuum tubes in your LS28 have the unit while it is sitting on a soft been burned in, tested and electrically surface such as a thick rug or carpet. -
Page 8: Connections
Connections Back Panel Connections RS-232 connector Main Outputs Control Record Outputs connections Balanced Inputs Single-ended Inputs Fuse Holder A.C. Mains connector... -
Page 9: Input Connectors
Two pairs of BAL/SE main outputs are other equipment. Only use the power provided. The outputs are connected switch on the front of the LS28 for On/ in parallel. If using both outputs Off control of the preamplifier, or the simultaneously, the combined input IR input, RS232 or remote control. -
Page 10: Front Panel Controls And Display
Operation Front Panel Controls and Display Vacuum Fluorescent Input Select Volume Display Power On/Off Menu Mute Enter Invert Phase (used with Menu) Mono/Stereo... -
Page 11: Start-Up
Note receptacle. • Press power switch (either on the remote The LS28 should be turned on before or front panel). The preamplifier will the amplifier in your system. If the begin the warm-up sequence, which lasts... -
Page 12: Front Panel Controls
The LS28 has two microprocessor-driven The menu button enters the setup menu rotary controls and six buttons (Power, of the LS28 to allow customizing certain Menu, Enter, Mono, Invert, and Mute). settings of the preamplifier. See page 15 for further details about using the setup menu. -
Page 13: Remote Only Functions
LS28. This is useful to determine Balance the approximate number of hours the vacuum tubes have been in use. After... -
Page 14: System Settings - Menu Tree
Operation System Settings - Menu Tree... -
Page 15: Settings Menu
Operation Settings Menu Note The LS28 has been designed with a simple, For the following menu settings, please refer intuitive menu to allow adjustment of to the menu tree on page 14 for examples the various features of the preamplifier. -
Page 16: Processor Mode
Operation Processor Mode Tube Hours The LS28 has the ability to assign unity gain The tube hours display shows the (also called ‘pass through’) to one of the accumulated time the LS28 has been eight inputs available in the event it will be powered on. -
Page 17: Display Brightness
When the lowest setting (off) is zero after a power off cycle. When volume selected, the display will remain on for reset is set to ‘OFF’, the LS28 will also five seconds after any button is pushed, remember settings after a power cycle. -
Page 18: Maintenance
Cleaning It is recommended that you replace the To maintain the new appearance of this 6H30 vacuum tubes of your LS28 in sets. preamplifier, occasionally wipe the All of the tubes in your preamplifier front panel and top cover with a soft, have been matched to have similar damp (not wet) cloth to remove dust. -
Page 20: Warranty
Limited Warranty are listed on the Audio Research factory, along with a the warranty card accompanying the photocopy of the dated purchase receipt product in its shipping carton. The... -
Page 21: Specifications
Specifications Frequency Response: +0-3dB, 0.4Hz to 200kHz at rated output (Balanced, 200k ohms load). THD + noise: Less than .007% at 2V RMS BAL output. Dynamic Range: >122 dB (AES17) Gain: Main output: 18.5dB Balanced output, 12.5dB SE output. Record out: 0dB (Processor input: 0dB BAL output). - Page 22 3900 Annapolis Lane North Plymouth, MN 55447 www.audioresearch.com Specifications subject to change without notice. ©2016 Audio Research Corporation. Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation. 95000015...
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