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17

Display Brightness

The display brightness feature offers six 

different settings (including off) for the 

vacuum fluorescent display on the front 

panel. When the lowest setting (off) is 

selected, the display will remain on for 

five seconds after any button is pushed, 

after which it will revert to a black screen 

with a small, illuminated square in the 

center to indicate the unit is powered on.

To change the display brightness, press 

the ‘MENU’ button until ‘DISPLAY 

BRIGHTNESS’ appears. Press the enter 

button. Using the volume knob on the front 

panel, or the up/down volume buttons on 

the remote, change the display brightness 

to your preference. Once you have selected 

the appropriate brightness, there is no need 

to press ‘ENTER’ or any further buttons.

Note

The remote control offers direct control 

of the display brightness via two buttons 

labeled ‘DISP UP’ and ‘DISP DN’. You 

can choose to use these buttons as an 

alternate to the settings menu. 

Operation

Volume Reset

The volume reset feature tells the LS28 to 

either remember the volume settings for 

each individual input, or to reset 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 the display 

reads ‘VOLUME RESET’. Press ‘ENTER’, 

and use the volume knob on the front 

panel, or the up/down volume buttons on 

the remote, to select ‘ON’ or ‘OFF’. Press 

‘ENTER’ to choose the appropriate setting, 

and ‘ENTER’ once again to confirm. The 

display will read ‘OKAY’ and show the 

current setting for volume reset.

Input Naming

The LS28 is pre-loaded with a selection of 

names which can be assigned to the eight 

inputs of the preamplifier, allowing for 

easier identification of the various inputs. 

When selected, the chosen input name will 

display above the default name (BAL 1, SE 3, 

etc.) on the normal operation screen.

To select an input name for any of the 

inputs, press the ‘MENU’ button until 

‘INPUT NAMING’ is displayed. Press the 

‘ENTER’ button, and use the volume knob 

on the front panel, or the up/down volume 

buttons on the remote, to select the 

desired input for naming. Press ‘ENTER’ to 

engage the naming utility, and using the 

volume knob or up/down volume buttons, 

select the appropriate name for the input. 

Press ‘ENTER’ a final time to confirm the 

input name. The display will show ‘OKAY’.

Содержание LS28

Страница 1: ...LS28...

Страница 2: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 19: ...19...

Страница 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...

Страница 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...

Страница 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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