Infinity-Alpha1200S-ps-sm维修电路原理图.pdf
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1、 Alpha 1200sAlpha 1200s Powered Subwoofer SERVICE MANUAL Infinity Systems Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 Rev1 4/2004 RadioFans.CN 收音机爱 好者资料库 - CONTENTS - SPECIFICATIONS .1 DETAILED SPECIFICATIONS .2 CONTROLS. .4 CONNECTIONS. .5 OPERATION. .6 BASS OPTIMIZATION SYSTEM.7 B
2、LOCK DIAGRAM.8 BULLETIN INF2004-01. .9 EXPLODED VIEW.10 PCB DRAWINGS.11 ELECTRICAL PARTS LIST .16 INTEGRATED CIRCUIT/TRANSISTOR DIAGRAMS.21 SCHEMATICS .22 PACKAGE . .26 Infinity Alpha 1200s Basic Specifications Frequency Response 28Hz 150Hz (3dB) Maximum Amplifier Output 500 watts RMS (20Hz 150Hz wi
3、th 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 (20.5kg) Optional Accessory Bass Optimization Test TIGHTEN TERMINALS 1. 2. BLACK = STRIPE = N
4、O STRIPE = + RED = + Alpha 1200s 5 INFINITY ALPHA 1200S Power On Plug your subwoofersAC cord into a wall outlet.Do not use the outlets on the back of the receiver. Initially set the Subwoofer Gain (Volume) Control ?to the “min”position. Turn on your sub by pressing the Power Switch ? on the rear pan
5、el. Auto On/Standby With the Power Switch ?in the ON position,the Power Indicator LED ?will remain backlit in red or green to indicate the On/Standby mode of the subwoofer. RED = STANDBY (No signal detected,Amp Off) GREEN = ON (Signal detected,Amp On) The subwoofer will automatically enter the Stand
6、by mode after approximately 10 minutes when no signal is detected from your system.The subwoofer will then power ON instantly when a signal is detected.During periods of normal use,the Power Switch ?can be left on.You may turn off the Power Switch ? for extended periods of nonoperation,e.g.,when you
7、 are away on vacation. Adjust Gain Turn on your entire audio system and start a CD or movie soundtrack at a moderate level.Turn up the Subwoofer Gain (Volume) Control ?about half way.If no sound emanates from the subwoofer,check the AC-line cord and input cables. Are the connectors on the cables mak
8、ing proper contact? Is the AC plug connected to a “live”receptacle? Has the Power Switch ? been pressed to the “On”position? Once you have confirmed that the subwoofer is active,proceed by playing a CD,record or cassette.Use a selection that has ample bass information. Set the overall volume control
9、 of the preamplifier or stereo to a comfortable level. Adjust the Subwoofer Gain (Volume) Control ? until you obtain a pleasing blend of bass.Bass response should not overpower the room but rather be adjusted so there is a harmonious blend across the entire musical range.Many users have a tendency t
10、o set the subwoofer volume too loud, adhering to the belief that a subwoofer is there to produce lots of bass.This is not entirely true.A subwoofer is there to enhance bass,extending the response of the entire system so the bass can be felt as well as heard.However,overall balance must be maintained
11、 or the music will not sound natural.An experienced listener will set the volume of the subwoofer so its impact on bass response is always there but never obtrusive. OPERATION Crossover Adjustments The Crossover Adjustment Control ? determines the highest frequency at which the subwoofer reproduces
12、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 subwoofers efforts on the ultradeep bass sounds required by todays films and music.If you are using smaller bookshelf speakers
13、 that do not extend to the lower bass frequencies,set the Crossover Adjustment Control to a higher setting,between 120Hz 150Hz. Note: This control will have no effect if the Low-Pass Filter Selector Switch ? is set to “Off.”If you have a Dolby Digital or DTS processor/receiver,the Crossover Frequenc
14、y is set by the processor/receiver.Consult your owners manual to learn how to view or change this setting. Phase Control The Phase Switch ? determines whether the subwoofer speakers piston-like action moves in and out with the main speakers,0,or opposite the main speakers,180.Proper phase adjustment
15、 depends on several variables such as room size, subwoofer placement and listener position.Adjust the phase switch to maximize bass output at the listening position. Alpha 1200s 6 INFINITY ALPHA 1200S Infinitys Bass Optimization System is a simple-to-use,yet sophisticated,low-frequency calibration s
16、ystem.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 m
17、uch or more by the listening room than by the loudspeaker itself.Placement of the loudspeakers and listeners and the acoustical characteristics of the room surfaces are all important determinants of bass quantity and quality.In most practical situations,there is little that can be done about this, e
18、xcept for patient trial-and-error repositioning of the loudspeakers and listeners.Usually,the practical constraints of a living space and the impracticality of massive acoustical treatment mean that equalization is the only practical solution. Professional sound engineers routinely employ sophistica
19、ted measurement systems and equalizers to optimize speakers to the installation.This was never practical for the home audiophile. This is why the Bass Optimization System was created.It enables you to identify the dominant low-frequency response characteristic of your room.Once you know the problem,
20、the Bass Optimization System provides the tools needed to optimize the low-frequency characteristics of the speakers to the room they are in,exactly as the professional sound engineers do it. Preparations Before beginning the bass tests,please check the following: Make sure all three Bass Optimizati
21、on System controls on the subwoofer are turned fully clockwise. Make sure the loudness contour (if any) on your receiver/ processor/preamp is turned off. Set the receivers/processors tone controls (Bass and Treble) to their center or flat positions. Bypass all surround and effects features of your r
22、eceiver/ processor/preamp or set to Stereo Bypass. If you are using a multichannel surround processor or receiver,make sure all bass-management features are properly set.The Audio channels should all be set to “Small”or “High- Pass” and the subwoofer set to “On.” Set the Bass Optimization System Sel
23、ector ? to “On.” For best results,it is recommended that all major furnishings are in place and that all doors and windows in the listening area are in their normal positions.That is,if you normally listen to music with all doors closed,then this is how they should be during this procedure. BASSOPTI
24、MIZATIONSYSTEM To solve a problem,it helps to first identify whether you have one and,if so,what it is.First,play a variety of music and films with energetic bass sounds,like bass guitar,kick drum,keyboards, etc.A kick drum should produce a tight “thump” , not a flabby “boom. ”Bass melody or harmony
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