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Summary of Contents for Audio Research LS28SE
- Page 1 LS28SE H I G H D E F I N I T I O N ®...
- Page 2 There is only One Reference®...
- Page 3 Thank you for choosing the LS28SE to be a part of your high performance music listening 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.
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Page 4: Table Of Contents
Contents Warnings Installation Before Operating the LS28SE In Your System A Note about Vacuum Tubes Connections Back Panel Connections Input Connectors Output Connectors A.C. Power Connection RS-232, IR Input, and 12v Trigger Operation Front Panel Controls and Display Start Up... -
Page 5: Warnings
For continued protection against fire To prevent fire, or shock hazard, do not hazard, replace the fuse only with the expose your LS28SE to rain or moisture. same type and rating as specified at the fuse holder Do not place objects containing water on (see page 19 for fuse information). -
Page 6: Installation
Remove all screws fastening the top Before operating the LS28SE cover. Carefully remove each vacuum Your LS28SE preamplifier is shipped tube from its protective foam and match with the vacuum tubes packed in a its location ‘V’ number (written on the separate foam-lined carton. -
Page 7: In Your System
A Note about Vacuum Tubes only on a smooth, hard surface, and also The vacuum tubes in your LS28SE have assist to isolate the preamplifier from been burned in, tested and electrically spurious vibrations. For upright stability... -
Page 8: Connections
Fuse Holder A.C. Mains connector Input Connectors Output Connectors The LS28SE provides eight pairs of input Two pairs of BAL/SE main outputs are connectors; four balanced and four provided. The outputs are connected singleended, labeled BAL 1-4 and SE 1-4. -
Page 9: C. Power Connection
A.C. Power Connection Important It is important that the LS28SE be Use the best available speaker wires connected via its supplied 15 amp and interconnects. Audio Research IEC 14-gauge power cord to a secure, cannot emphasize this enough. As better dedicated A.C. -
Page 10: Operation
Operation Front Panel Controls Vacuum Fluorescent Input Select Volume Display Power On/O Menu Mute Enter Invert Phase (used with Menu) Mono/Stereo... -
Page 11: Start Up
The LS28SE should be turned on before receptacle. the amplifier in your system. If the LS28SE Press power switch (either on the is turned on after the amplifier, it will am- •... -
Page 12: Front Panel Controls
The LS28SE has two microprocessor-driv- The menu button enters the setup menu en rotary controls and six buttons (Power, of the LS28SE to allow customizing cer- Menu, Enter, Mono, Invert, and Mute). tain settings of the preamplifier. See page 15 for further details about using the setup Left Rotary control (Input Select) menu. -
Page 13: Remote Only Functions
Pressing the ‘HOURS’ button will display display to indicate the unit is powered on. the total accumulated hours of operation for the LS28SE. This is useful to determine Balance the approximate number of hours the vacuum tubes have been in use. After... -
Page 14: Settings Menu
Settings Menu Menu Tree Auto Shutdown Processor Mode Tube Hours Display Brightness Volume Reset Input Naming... - Page 15 Settings Menu Note The LS28SE has been designed with a For the following menu settings, please simple, intuitive menu to allow adjustment refer to the menu tree on page 14 for of the various features of the preamplifier. examples of the front panel display.
- Page 16 Settings Menu Processor Mode Warning The LS28SE has the ability to assign unity When processor mode is assigned to an gain (also called ‘pass through’) to one input, do NOT connect a source (such as of the eight inputs available in the event a CD player or phono stage) to that input.
- Page 17 When the lowest setting to zero after a power off cycle. When (off) is selected, the display will remain volume reset is set to ‘OFF’, the LS28SE on for five seconds after any button is will also remember settings after a power pushed, after which it will revert to a cycle.
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Page 18: Maintenance
Cleaning It is recommended that you replace the To maintain the new appearance of this 6H30 vacuum tubes of your LS28SE in preamplifier, occasionally wipe the front sets. All of the tubes in your preamplifier panel and top cover with a soft, damp have been matched to have similar (not wet) cloth to remove dust. -
Page 19: Warranty
3-Year Limited Warranty beyond the ability of the importer is or a 90-Day Limited Warranty (vacuum required, Audio Research will fulfill the tubes). This Limited Warranty initiates terms and conditions of the Limited from the date of purchase, and is limited Warranty. -
Page 20: 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: 18.7dB Balanced output, 9.3dB SE output. Record out: 0dB (Processor input: 0dB BAL output). - Page 22 6655 Wedgwood Road North Maple Grove, MN 55311 www.audioresearch.com Specifications subject to change without notice. ©2020 Audio Research Corporation. Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation.
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