Shure HTSSOSPA User's Manual
Contents
1. F fi jo erll TA SPA Fita Pow HTS50SPA SIGNAL PROCESSING STEREO POWER AMPLIFIER INTRODUCTION Congratulations You have chosen the Shure HTS5OSPA Signal Processing Stereo Power Amplifier specially made as an integral part of your Shure HTS Theater Reference System The other elements of the Shure HTS Reference system are the HTS5300 Acra Vector Logic Decoder HTS5OCF Center Front Loudspeaker HTSS5OLRS Front and Surround Loudspeakers and HTS50SW Subwoofer Loudspeaker These products of Shure s Home Theater Sound Division re create in your home the same realism and immediacy you hear in the very best motion picture theaters and production dubbing stages The Shure HTS5300 Acra Vector Decoder is the main control center for your Home Theater System the HTS5300 employs the latest exclusive Shure patented techniques in analog and digital signal processing electronics See the System Manual included with your HTS Decoder for complete system installation connection and operation information Theory of Operation The HTS5OSPA amplifier precisely matches both the Shure HTS Decoder and Shure HTS Loudspeakers The output response of the U S Patent 4 696 036 HTSSOSPA is tailored to correspond to the parti cular Shure HTS loudspeaker system selected in each of its HTS speaker correlated switch selectable Operational Modes Through extensive laboratory testing and many hours of program listening the Shur2. the protection circuits should be engaged Protection Defeat switch out D POWER The pushbutton switch turns power on and off INDICATORS POWER Red light in the pushbutton Power switch illuminates to indicate power is on SIGNAL Green light illuminates when a signal is present in the channel OVERLOAD Red light illuminates to indicate limiting when the Protection Defeat switch is out or to indicate clip ping when the Protection Defeat switch is pushed in In normal use with HTS50 loudspeakers the overload light will turn on occasionally for high level dialogue or music peaks INDICATOR TABS AND SLOTS Snap the supplied Indicator Tabs into these slots when the loudspeaker is connected to the amplifier The tabs show the speaker location corresponding to each channel LEFT RIGHT CENTER a SURROUND LEFT SURROUND RIGHT SUBWOOFER OR BRIDGED If speaker locations are reassigned remove the tabs by carefully prying one comer out of the slot with a pointed instrument The tab can then be removed with the fingertips Take care not to scratch or damage the amplifier front finish when removing the indicator tab BACK PANEL INPUT CONNECTORS Channel 1 and Channel 2 input connectors are heavy duty gold plated phono RCA type jacks Use only Channel 1 input when BRIDGED MODE output is selected K OUTPUT CONNECTORS All output connectors are five way gold plated bin
3. Channel 1 is in Operational Mode SW amplifier output extends from 33 to 80 Hz to match the frequency response of the HTS50SW Subwoofer To further enhance its versatility each channel of the HTS50SPA amplifier also includes a Flat output mode making it suitable for use with any loudspeaker An excursion limiting circuit in the HTSSOSPA continuously monitors the audio signal This circuitry modifies the low frequency response only when necessary to prevent overexcursion of the loudspeaker connected to that channel The characteristics of this circuitry depend on the Operational Mode selected since each Mode is correlated to the HTS Loudspeaker me ph ams SET Ee en aren ee acer nce ae s neon eae SRS E A Se so e DD o A ee ee ee ee a Parla RV AN a ON I ED OD TT T e EL in o ELE me CO te E TNS ES CREE e i ee ene apen e come cer RES a ni im cmo aa ear ms re ra da mi pri ERA OP LOY LAE NL TE MN mei a e AA mr ETT mm A DEN TO E O TT TU TO SD NI ER DS ca TS A ma e me eras em memo mms upa mem e mo mo em emerge rea rei aaa a e CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL attached at the output terminals In addition the amplifier features a clipping protection circuit This circuit does not add distortion to the signal as do ordinary soft clipping circuits Instead it reduces the gain of the
4. amplifier only when necessary to avoid long term hard clipping This circuit can be selectively disabled by pressing the Protection Defeat switch for each channel desired The slotted control knobs on the HTSSOSPA are intended to require insertion of a coin to change their settings These knobs resist accidental changes of position Two LED s on the front panel illuminate to indicate the presence of an audio signal and either operation of the protection circuit or clipping Power on is indicated by the illuminated power button Amplifier Architecture To interface with the outside world the amplifier input connectors are gold plated RCA type phono jacks output connectors are gold plated five way binding posts suitable for use with most high performance audio cables To receive and generate signals at the input and output connectors respectively scrupulous care has been exercised in design and construc tion of the HTSSOSPA with highest quality components used throughout The power amplifier circuit of each channel uses a hybrid audio power module construction This compact assembly technique combines semiconductor chips normally used in amplifiers as separate discrete devices into a tightly coupled unit on a multilayer high thermal conductivity substrate The high thermal conductivity of the base substrate results in a close thermal match of the amplifier output circuits to the voltage and current gain driver stages Each disc
5. level are controlled at the HTS Decoder or its Remote Control In certain cases other level settings can also be recommended 1 To compensate for room variations see the Balance and Phasing section of the HTS5300 Manual for specific instructions 2 For a more visceral low end in theatrical presentations either turn all level controls to 3 except for the HTS50SW Subwoofer or turn all levels controls to 6 except for the Subwoofer In both setups leave the Subwoofer channel level control at 0 The additional ultra low frequency emphasis in either alternate level setting can provide exceptional excitement and even greater enjoy ment in home theater sound These slotted control knobs are intended to require insertion of a coin to change their settings they resist accidental changes of position OPERATIONAL MODE The Operational Mode switches select the signal process ing characteristics of each amplifier channel independently to complement the response characteristics and excur sion limits of the HTS Loudspeakers HTS50CF Center Front HTS50LRS Front Left Right and Surround or HTSSOSW Subwoofer selectable in Channel 1 only These slotted control knobs are also intended to require insertion of a coin to change their settings they resist accidental changes of position An excursion limiting circuit continuously monitors the audio signal and modifies the low frequency response only when necessary to prevent o
6. ding posts that will accept any of the following methods of connection bare wire wrapped around the post bare wire inserted through the hole in the post spade lug around the post pin connector through the hole in the post or banana plug inserted in the jack These output connectors will accommodate most high performance audio cables Gold 080 inch diameter pins soldered to the loud speaker cables and inserted under the binding post hex caps fastened finger tight are the most reliable connection To maintain proper speaker polarity in the completed HTS system it is extremely important that each plus amplifier output terminal is connected only to a plus speaker terminal and each minus amplifier output terminal is connected only to a minus speaker terminal 1 CHANNEL 1 OUTPUT Both plus and minus terminals are used in normal two channel operation to drive an HTS5OCF HTS5SOLRS HTS50SW or any other loudspeaker Only the plus terminal of Channel 1 is used as the plus or high side output connection to a loudspeaker when the HTSSOSPA is in the BRIDGED MODE 2 CHANNEL 2 OUTPUT Both plus and minus terminals are used in normal two channel operation to drive an HTSSOCF HTSSOLRS HTS50SW or any other loudspeaker Only the plus terminal of Channel 2 is used as the minus or low side output connection to a loudspeaker when the HTS5SOSPA is in the BRIDGED MODE L EXTERNAL FUSE The 10A 250 V Slo Blo
7. e HTS Division has achieved an optimum correlation between the program material and sound delivered to the room As the program signal is traced through the HTSSOSPA to the output connectors it is corrected for the loudspeaker crossover interaction loudspeaker to room transfer function and program material dependence whether the program is cinema or conventional music audio Multiple circuit functions combine to control the presentation of an accurate soundfield at the listener positions in a room Such attention to detail is present in only the finest audio systems and the Shure HTS Theater Reference System sets the new standard Consequently the HTSSOSPA offers the user an amplifier that is outstanding for highest quality home theater audio video presentations as well as one that provides unique signal control in conventional multi channel audio only listening The LRS and CF extended low frequency Operational Modes are intended for use respectively with the HTSSOLRS and HTSSOCF Loudspeakers when the HTS system does not include a subwoofer In these two Modes amplifier low frequency output is extended to help compensate for the lack of a subwoofer The LRS and CF modes are also intended for use with the HTSSOLRS and HTSSOCF loud speakers but in a system that does include the HTS50SW Subwoofer In these two Modes amplifier low frequency output cuts off at 80 Hz to complement the frequency range of the HTS50SW Subwoofer When
8. er Output 100 watts minimum per channel into 8 ohms with less than 0 1 THD Input Impedance 100 kilohms Recommended Minimum Output Load Impedance 4 ohms Input Sensitivity Full Power Output in Flat Mode 0 dBV 1 0 V Dynamic Range Greater than 100 dB from noise level to clipping 300 Hz to 20 kHz Power Requirements 120 Vac 10 60 Hz Certifications Listed by Underwriters Laboratories Inc Overall Dimensions 102 mm H x 429 mm W x 356 mm D 4 x 16 x 14 in Weight 12 3 kg 27 lb In other modes Frequency Response and Sensitivity are tailored to complement the individual HTS Loudspeakers Frequency Response and Sensitivity TYPICAL SYSTEM ARRANGEMENT AUDIO OUTPUTS ae Gad Toe LAGER BISC PLAYER ii HTS5300 STEREO CASSETTE DECK Na f OR CO PLAYER 9 t SS f E AUDIO OR NUTS AUDIO VIDEO SWITCHER TAPE OUT OR PREAMPLIFIER ee ee oe ee ee SWITCH OW HTSSOSPA NORMAL MODE a 4 Anima DUTPUT Cs HTSSOLRS O HTSSOLR S MDOE CHANNEL NORMAL E OUTPUT MODE Nk nmo meus ourTPur A mm RIGHT FRONT LEFT FRONT CENTER LOVOSPEAKER SUBWOOFER LEFT LOUDSPEAKER RIGHT o j O E HTSSOLRS HTSSOLRS SURROUND SURROUND HTSSOSH TYPICAL SYSTEM CONNECTIONS SHURE HTS The Home Theater Sound Division of Shure Brothers Inc 222 Hartrey Avenue Evanston IL 60202 3696 Copyright 1988 Shure Brot
9. fuse accessible from the rear panel is user replaceable If the fuse should blow disconnect the power cord and remove the fuseholder and fuse by pressing inward and rotating counterclockwise Replace the fuse only with one of the same type same amperage and voltage rating If the fuse should blow a second time do not replace it again Contact the Shure Service Department or other qualified service personnel to correct the problem See Bridged Connection instructions BRIDGED CONNECTION If the amplifier is used in the Bridged Mode to prevent the risk of electric shock the following instructions describe the only acceptable method of connection see illustration Thread the speaker lead through the hole in the supplied connector cover plate 2 Loosen the insulated red locking cap on the binding post strip the end of the speaker lead approximately 19 mm 3 4 in and insert the stripped wire into the hole in the binding post Twist the stripped wire around the post and tighten the locking cap 3 Attach the cover plate over the binding post terminal and fasten it with the supplied screws NOTE To ensure correct Bridged Mode speaker polarity connect the plus terminal of Channel 1 only to the plus speaker terminal and connect the plus terminal of Channel 2 only to the minus speaker terminal BRIDGED CONNECTION SPECIFICATIONS Frequency Response Flat Mode 20 Hz to 20 kHz 0 5 dB Pow
10. hers Inc 27A8165 IA Printed in USA
11. quency cutoff at 80 Hz for use in a system that does include a subwoofer CFx Output matches HTSS0CF Loudspeaker with low frequency exten sion down to 55 Hz for use in a system that does not include a subwoofer SW Output matches HTS50SW Subwoofer with controlled low frequency boost and response from 33 to 80 Hz This Mode is available only on Channel 1 2 CHANNEL 2 Identical to Channel 1 except the extreme clockwise position in Channel 2 is Bridge instead of SW Explanation follows BRIDGE Input from Channel 1 appears at both Channel 1 and Channel 2 plus outputs Channel 2 Input does not function when Mode Selector is in Bridge Use the Operational Mode selector of Channel 1 set to any appro priate position to control equalization of the output to match HTS50 Loudspeakers or set to Flat for any other loudspeaker use the Channel 1 Level control to determine the Bridged output level In Bridged Mode the protection circuitry for both channels should have the same status Protection Defeat pushbuttons both out or both in Total output is 250 watts into 8 ohms from 1 volt input Refer to Bridge Connection instructions for specific details on connecting loud speakers for this Operational Mode C PROTECTION DEFEAT Individual pushbutton switches for Channel 1 and Channel 2 disengage the built in protection circuitry that prevents long term hard clipping at the output Under most ordinary circumstances
12. rete device now tracks the other dependent on power dissipation in the output stage This is not possibie with the discrete separated parts using normal amplifier construction Thus the HTS5OSPA takes advantage of one of the benefits of monolithic integrated circuits while still retaining a discrete component topology as part of the hybrid amplifier module The total amplifier circuit combines the hybrid module and special control circuitry to deliver high current and voltage with low distortion and precise control of the amplifier circuit in overload conditions The output amplifiers in each channel are complemented by signal processing circuits which match amplifier operation to the HTS loudspeakers The total combines low noise FET operational amplifiers high quality small signal capacitors and resistors multiple computer grade power supply capacitors glass epoxy circuit boards and a high current low noise instrumentation grade toroidal power transformer The result of these circuitry techniques is an amplifier of exacting specifications precisely processing the input signal and accurately matching HTS50 Series Loudspeakers to produce many years of enjoyment of the finest film and music sound stages HTS50SPA FRONT PANEL CONTROLS A LEVEL For both Channel 1 and Channel 2 the normal position for the Level control is 0 no attenuation for all loud speakers In the HTS Theater Reference System total Volume level and Surround
13. ver excursion of the particular HTS loudspeaker connected to that channel The characteristics of this circuitry depend on the Operational Mode selected This limiter circuit is always active for loudspeaker protection There are two possible Operational Modes for the CF and LRS Loudspeakers selected according to whether or not a subwoofer is used in the Home Theater Sound System When the selector is in the CF or LRS position the amplifier low frequency output cuts off at 80 Hz to match the HTS50SW Subwoofer response these Operational Modes should be selected when the HTS system does include the HTS50SW subwoofer When the system does not include the sub woofer the selector should be in the CF or LRS Mode In these Modes the amplifier low fre quency output extends down to 60 Hz the ex tended low frequency output signal is intended to help compensate for the lack of a subwoofer 1 CHANNEL 1 FLAT Output has no signal processing in the signal path other than the defeatable clipping protection circuit In Flat Mode the HTSSOSPA is suitable for use with any loudspeaker LRS Output is tailored to match the HTS5OLRS Loudspeaker with low frequency cutoff at 80 Hz for use in a system that does include a subwoofer LRS Output matches HTSSOLRS Loud speaker with low frequency extension down to 60 Hz for use in a system that does not include a subwoofer CF Output matches HTSOCF Loudspeaker with low fre
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