Owner's Manual Model LS27 STEREO PREAMPLIFIER 3900 ANNAPOLIS LANE NORTH / PLYMOUTH, MINNESOTA 55447-5447 / PHONE: 763-577-9700 FAX: 763-577-0323 www.audioresearch.
Contents Model LS27 Page No. Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Installation of Vacuum Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model LS27 D E F I N I T I O N S E R I E S DISPLAY VOLUME INPUT POWER MONO BAL/SE VACUUM TUBE PREAMPLI FI ER PROC MONITOR MUTE M O D E L L S 2 7 HIGH DEFINITION ® MODEL LS27 TUNER PHONO CD VIDEO AUX 1 AUX 2 MONITOR PROCESSOR RECORD OUT MAIN OUT 1 STEREO PREAMPLIFIER MAIN OUT 2 RIGHT PLYMOUTH, MINNESOTA MADE IN U. S. A. WARNING TO PREVENT FIRE AND SHOCK HAZARD, DO NOT EXPOSE THIS DEVICE TO RAIN OR MOISTURE. UNIT MUST BE OPERATED IN A HORIZONTAL POSITION.
Model LS27 Adjusts illumination of display to eight levels plus off. DISPLAY POWER Turns power on/off. CD TUNER VIDEO Select one of six available audio inputs. PHONO AUX 1 AUX 2 Routes the monitor input signal to the main outputs. BAL L MON BAL R Adjusts balance left. Bar graph indicates balance in display window. Mutes output of the LS27. n l VOL DN Adjusts volume down. Visible as numeric readout in display window.
Model LS27 Preface Warning! Please take time to carefully read and understand the following instructions before you install or attempt to operate your Audio Research LS27 preamplifier. Becoming familiar with the product and its correct operating procedures will help assure you of maximum musical enjoyment and reliable operation. The effort you invest now will be well rewarded in the years ahead.
Model LS27 Vol UP buttons on the remote control. Volume adjustment is indicated in the display window by numeric digits on 0 –103 scale. Do not turn volume up beyond normal listening levels when “mute” is engaged to avoid unexpected or possiblydamaging sound levels. Reduce volume level whenever changing input sources, even when muted. The rotary control on the right selects any of six input sources connected to the preamp: CD, Video, Aux 1, Aux 2, tuner and phono.
Model LS27 BAL L/ BAL R: Adjusts balance left or right. Adjustment appears in display window as movable marker on bar graph. Useful for compensating for uneven speaker placement or imbalanced output from a phono cartridge. HOURS: When pressed, displays number of operating hours vacuum tubes have been in service. WARNING: after replacing tubes, this function should be reset to “0” only by a qualified technician.
Model LS27 “Mute” will will flash in the display window for approximately 50 seconds, then cease flashing and remain in the display. Press “Mute” to initiate operation. 4. Select input source, then BAL or SE as necessary. Shut-Down: 1. 2. 3. 4. 5. Activate “Mute” function. Set Volume level to “0”. Turn off power amplifier(s). Press Power switch to “off ”. Turn off input sources.
Model LS27 Limited Warranty Specifications Audio Research Corporation products are covered by a 3-Year Limited Warranty, or a 90-Day Limited Warranty (vacuum tubes). This Limited Warranty initiates from the date of purchase, and is limited to the original purchaser, or in the case of demonstration equipment, limited to the balance of warranty remaining after original shipment to the retailer or importer. FREQUENCY RESPONSE: +0-3dB, 0.
