Audio Research LS28 User Manual Download Page 22 | Manualshive

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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.

3900 Annapolis Lane North

Plymouth, MN 55447

www.audioresearch.com

95000015

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Summary of Contents for LS28

Page 1: ...LS28...

Page 2: ......

Page 3: ...gin listening however please take a few minutes to read through this guide for useful information concerning the operation of your new preamplifier Once installed please allow an appropriate break in...

Page 4: ...er 5 6 7 7 8 9 9 9 9 9 Operation Front Panel Controls and Display Start Up Shut Down Break in Front Panel Controls Remote Only Functions Settings Menu System Settings Menu Tree Settings Menu Auto Shut...

Page 5: ...ontinued protection against fire hazard replace the fuse only with the same type and rating as specified at the fuse holder see page 19 for fuse information This unit is RoHS compliant The LS28 has au...

Page 6: ...ns Installation Remove all screws fastening the top cover Carefully remove each vacuum tube from its protective foam and match its location V number written on the base of the tube to the V number pri...

Page 7: ...enclosure such as an equipment rack make certain that adequate airflow above and to each side of the unit is provided Audio Research recommends a minimum of 6 8 inches 15 20 cm of clearance above the...

Page 8: ...8 Connections Back Panel Connections Record Outputs Main Outputs RS 232 connector Control connections Fuse Holder A C Mains connector Single ended Inputs Balanced Inputs...

Page 9: ...amplifier s and could cause serious serious damage to the amplifier s or loudspeakers A C Power Connection It is important that the LS28 be connected via its supplied 15 amp IEC 14 gauge power cord to...

Page 10: ...10 Operation Front Panel Controls and Display Input Select Vacuum Fluorescent Display Volume Power On Off Menu Enter used with Menu Mono Stereo Invert Phase Mute...

Page 11: ...OFF will flash on the display until the warm up cycle is complete Select input source and adjust the volume as necessary Shut Down Activate MUTE function Turn off power amplifier s Press Power switch...

Page 12: ...preamp indicated by active display window The LS28 requires approximately 45 seconds to warm up this time is required to stabilize the vacuum tubes See Start Up Procedure on page 11 for details Menu...

Page 13: ...f the eight inputs available on the LS28 Display Brightness Adjustment The front panel display has six brightness settings as well as the ability to dim the display completely To change the brightness...

Page 14: ...14 Operation System Settings Menu Tree...

Page 15: ...the front panel display Both the MENU and ENTER buttons found on the front panel and remote as well as the volume knob or the up down volume buttons on the remote are used to make changes to the menu...

Page 16: ...the bottom line When using the input selected for processor mode note that in place of the volume number on the operation screen a pass through symbol will be shown Warning When processor mode is ass...

Page 17: ...eset them to zero after a power off cycle When volume reset is set to OFF the LS28 will also remember settings after a power cycle To change the status of the volume reset press the MENU button until...

Page 18: ...t Even with the power turned off a charge remains in the energy storage capacitors for hours or even days Cleaning To maintain the new appearance of this preamplifier occasionally wipe the front panel...

Page 19: ...19...

Page 20: ...the United States the authorized importing retailer or distributor has accepted the responsibility for warranty of Audio Research products sold by them The specific terms and remedies for fulfillment...

Page 21: ...16V RMS BAL 8V RMS SE Rated Outputs 2V RMS 1V RMS SE into 200K ohm balanced load maximum balanced output capability is 17V RMS at less than 0 5 THD at 1kHz Crosstalk 105dB or better at 1kHz Controls R...

Page 22: ...notice 2016 Audio Research Corporation Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation 3900 Annapolis Lane North Plymouth...

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