® POWERED SUBWOOFER Owner’s Guide • Infinity Alpha 1200s
IMPORTANT SAFETY PRECAUTIONS Read First! CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
INFINITY ALPHA 1200S OWNER’S GUIDE Table of Contents ii Important Safety Precautions 1 Unpacking the Subwoofer 1 Placement 2 Controls and Connections 3 Connections 4 Operation 5 Bass Optimization System™ 6 Maintenance and Service 7 Specifications INFINITY ALPHA 1200S iii
Infinity Alpha Series The Infinity Alpha Series of loudspeakers continues Infinity’s long-standing commitment to accurate sound reproduction. Our patented Ceramic Metal Matrix Diaphragm™ (C.M.M.D.™) drivers and proprietary Bass Optimization System,™ along with precision dividing networks and rigid, well-braced enclosures, combine to deliver uncompromised performance in any stereo or multichannel home theater. Unpacking the Subwoofer If you suspect damage from transit, report it immediately to your dealer.
CONTROLS AND CONNECTIONS Rear Panel BASS OPTIMIZATION SYSTEM 20 80 FREQUENCY -14.1 0 LEVEL 4.5 49.5 WIDTH 180 LP ON ON 0 LP OFF OFF POWER PHASE 50 150 CROSSOVER MIN GREEN: ON RED: STANDBY MAX GAIN ® LINE LEVEL IN R Alpha 1200s L CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN R HIGH LEVEL IN POWER WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
If your receiver/processor has subwoofer outputs for the left and right channels: CONNECTIONS If your receiver/amplifier does not have subwoofer outputs for the left and right channels or an LFE output: RECEIVER/PROCESSOR RECEIVER/AMPLIFIER Front Speaker Output BASS OPTIMIZATION SYSTEM 20 80 FREQUENCY -14.1 0 LEVEL 4.5 49.
OPERATION Power On Crossover Adjustments Plug your subwoofer’s AC cord into a wall outlet. Do not use the outlets on the back of the receiver. The Crossover Adjustment Control determines the highest frequency at which the subwoofer reproduces sounds. If your main speakers can comfortably reproduce some low-frequency sounds, set this control to a lower frequency setting, between 50Hz – 100Hz.This will concentrate the subwoofer’s efforts on the ultradeep bass sounds required by today’s films and music.
BASS OPTIMIZATION SYSTEM™ Infinity’s Bass Optimization System is a simple-to-use, yet sophisticated, low-frequency calibration system. Each Interlude subwoofer contains a parametric equalizer that you can adjust following the directions below. By following these instructions, you can improve the sound of your system. The Bass Optimization System Goal It is a fact of audio that what we hear at low frequencies is determined as much or more by the listening room than by the loudspeaker itself.
plays the tones from the test CD and records the relative output level of each test tone, using the sound-level meter, on the provided measurement template. After all the tones are complete, the template contains a response curve for the frequencies below 100Hz.The user simply notes the frequency of the largest bass peak, calculates the correct amount of attenuation, and uses the “Q-Finder”to determine the width of the curve.
SPECIFICATIONS Infinity Alpha 1200s Frequency Response 28Hz – 150Hz (±3dB) Maximum Amplifier Output 500 watts RMS (20Hz – 150Hz with no more than 0.1% THD) Crossover Frequencies 50Hz – 150Hz, 24dB/octave, continuously variable Driver 12" (305mm) C.M.M.D. Dimensions (H x W x D) 17-1/2" x 17-1/4" x 18-1/4" (445mm x 438mm x 464mm) Weight 45 lb (20.
NOTES INFINITY ALPHA 1200S 8
® © 2002 Harman International Industries, Incorporated • Infinity Systems, Inc., 250 Crossways Park Drive, Woodbury, NY 11797 USA 800.553.3332 (USA only) www.infinitysystems.com *Trademark of Dolby Laboratories. DTS is a registered trademark of Digital Theater Systems, Inc. Infinity is a registered trademark, and Ceramic Metal Matrix Diaphragm (C.M.M.D.) and Bass Optimization System (B.O.S.) are trademarks, of Harman International Industries, Incorporated. Ceramic Metal Matrix Diaphragm (C.M.M.D.
