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16

Settings Menu

Processor Mode 

The LS28SE has the ability to assign unity 

gain (also called ‘pass through’) to one 

of the eight inputs available in the event 

it will be integrated into a system with 

a secondary control device, such as a 

surround sound processor. When an input 

is assigned as the processor input, the 

volume control on the LS28SE is disabled 

so that the processor’s volume is the only 

control used. 

To set up a processor input, connect 

the left and right output channels from 

your surround sound processor to the 

left and right inputs of your choice on 

the LS28SE. Press the ‘MENU’ button 

until ‘PROCESSOR MODE’ is displayed, 

and press ‘ENTER’. With ‘PROCESSOR’ 

displayed, turn the volume knob, or 

use the up/down volume buttons on 

the remote, to select the desired input 

for processor mode. Press the ‘ENTER’ 

button to select the input, and ‘ENTER’ 

once again to confirm the selection. The 

LS28SE will display ‘OKAY’ and show the 

selected input on 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 assigned to an 

input, do NOT connect a source (such as 

a CD player or phono stage) to that input. 

This will send full output from the source 

to your amplifier(s), and could cause 

serious damage to your loudspeakers or 

amplifier(s) - not to mention your ears! 

Tube Hours 

The tube hours display shows the 

accumulated time the LS28SE has been 

powered on. This is useful for determining 

the number of usage hours of the installed 

vacuum tubes. See A Note about Vacuum 

Tubes on page 7 for specific information 

regarding the tubes in the LS28SE. To 

reset the tube hours counter, press the 

‘MENU’ button until ‘TUBE HOURS’ is 

shown. Press the ‘ENTER’ button to 

display ‘ENTER TO RESET’. Press ‘ENTER’ 

again and the display will read ‘ENTER TO 

CONFIRM’. A final press of the ‘ENTER’ 

button will reset the tube hour counter to 

0 and the display will show ‘OKAY’. 

Note 

Once the hour counter has been reset, 

the total accumulated hours cannot be 

recalled. 

Summary of Contents for ARCLS28SE

Page 1: ...H I G H D E F I N I T I O N LS28SE...

Page 2: ...There is only One Reference...

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

Page 4: ...ote about Vacuum Tubes Back Panel Connections Input Connectors Output Connectors A C Power Connection RS 232 IR Input and 12v Trigger Front Panel Controls and Display Start Up Shut Down Break In Front...

Page 5: ...the same type and rating as specified at the fuse holder see page 19 for fuse information This unit is RoHS compliant The LS28SE has automatic muting to help protect system components in the event of...

Page 6: ...lowing instructions 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...

Page 7: ...s provided Audio Research recommends a minimum of 6 8 inches 15 20 cm of clearance above the LS28SE to maintain proper ambient operating temperature The ambient operating temperature should never exce...

Page 8: ...BAL SE main outputs are provided The outputs are connected in parallel If using both outputs simultaneously the combined input impedance of the amplifier s being driven by the LS28SE must be greater t...

Page 9: ...stem to be connected to the LS28SE for control purposes utilizing a standard mono 1 8 connector 12V Trigger Out The 12V DC trigger out jack provides the ability to remotely turn on and off the preampl...

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

Page 11: ...l 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 to off...

Page 12: ...eamp indicated by active display win dow The LS28SE requires approximately 45 seconds to warm up this time is re quired to stabilize the vacuum tubes See Start Up Procedure on page 11 for details Menu...

Page 13: ...e eight inputs available on the LS28SE 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 u...

Page 14: ...14 Settings Menu Menu Tree Tube Hours Processor Mode Auto Shutdown Volume Reset Display Brightness Input Naming...

Page 15: ...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 set...

Page 16: ...ected input on 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 process...

Page 17: ...hem to zero after a power off cycle When volume reset is set to OFF the LS28SE will also remember settings after a power cycle To change the status of the volume reset press the MENU button until the...

Page 18: ...o not tamper with a component or part inside the unit Even with the power turned off a charge remains in the energy storage capacitors for some time Cleaning To maintain the new appearance of this pre...

Page 19: ...ed the responsibility for warranty of Audio Research products sold by them The specific terms and remedies for fulfillment of the Limited Warranty may vary from country to country Warranty service sho...

Page 20: ...Maximum Input 16V RMS BAL 8V RMS SE Rated Outputs 2V RMS 1V RMS SE into 200K ohm balanced load maximum balanced output ca pability is 17V RMS at less than 0 5 THD at 1kHz Crosstalk 105dB or better at...

Page 21: ......

Page 22: ...out notice 2020 Audio Research Corporation Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation 6655 Wedgwood Road North Maple...

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