Owner's guide
Page 2
... by patent rights issued and pending. • Design Features B. Connecting Other Equipment 14 A. Voltage Conversion C. Introduction 3 II. The 901 Series III Loudspeaker System 4 A. Wire Selection 2. Tape Recorders B. Installation 6 A. Phasing/Wiring 3. Using the Preamp-Out/Main-In Circuit 4. Adjusting Your Equalizer Controls B. In Case of Contents I . Technological Innovations IV. Technical Information 18 A. Specifications B. Unpacking Instructions...
... by patent rights issued and pending. • Design Features B. Connecting Other Equipment 14 A. Voltage Conversion C. Introduction 3 II. The 901 Series III Loudspeaker System 4 A. Wire Selection 2. Tape Recorders B. Installation 6 A. Phasing/Wiring 3. Using the Preamp-Out/Main-In Circuit 4. Adjusting Your Equalizer Controls B. In Case of Contents I . Technological Innovations IV. Technical Information 18 A. Specifications B. Unpacking Instructions...
Owner's guide
Page 3
... material along with the complete packing material and notify your 901's. you for possible use later. The active equalizer is packed in this manual are important. TheBOSE 901SeriesIII, withits high proportionof reflected sound. Save the cartons and packing material for purchasing the BOSE 901 Series III Direct/Reflecting• speaker system. The detailed installation and placement...
... material along with the complete packing material and notify your 901's. you for possible use later. The active equalizer is packed in this manual are important. TheBOSE 901SeriesIII, withits high proportionof reflected sound. Save the cartons and packing material for purchasing the BOSE 901 Series III Direct/Reflecting• speaker system. The detailed installation and placement...
Owner's guide
Page 4
Correct Balance of Reflected and Direct Sound The BOSE 901 Series III is designed to use your listening room walls to provide maximum magnetic field energy. • An aluminum helical voice coil, providing better ...an insignificant 14 of the magnetic field (caused by the mechanical design constraints of total acoustic power at every frequency. 3. DESIGN FEATURES 1. Active Equalization The active equalizer electronically corrects for smoother, more controlled frequency response and lower distortion. • An injection molded frame, eliminating distortion of the total power). ...
Correct Balance of Reflected and Direct Sound The BOSE 901 Series III is designed to use your listening room walls to provide maximum magnetic field energy. • An aluminum helical voice coil, providing better ...an insignificant 14 of the magnetic field (caused by the mechanical design constraints of total acoustic power at every frequency. 3. DESIGN FEATURES 1. Active Equalization The active equalizer electronically corrects for smoother, more controlled frequency response and lower distortion. • An injection molded frame, eliminating distortion of the total power). ...
Owner's guide
Page 5
...optimum speaker performance in combination with lowdistortion. This precise contouring of the speaker beyond the audible range. The 901 Series III realizes additional advantages of active equalization with nine full-range matched drivers in a wide range of room positions (see SECTION VI). • ...isolates the acoustic pressure at each driver from other drivers to permit it to be designed for each group of the 901 Series III is to provide reactiveairloadingtoreducethemotionrequiredof the driver cones at frequencies inaudible to the human ear allows the drivers and enclosure to ...
...optimum speaker performance in combination with lowdistortion. This precise contouring of the speaker beyond the audible range. The 901 Series III realizes additional advantages of active equalization with nine full-range matched drivers in a wide range of room positions (see SECTION VI). • ...isolates the acoustic pressure at each driver from other drivers to permit it to be designed for each group of the 901 Series III is to provide reactiveairloadingtoreducethemotionrequiredof the driver cones at frequencies inaudible to the human ear allows the drivers and enclosure to ...
Owner's guide
Page 6
... Equalizer packed in placing the speaker cabinets will be obtained with the speakers placed between 12" and 24" from the reflecting wall. 2. Best results will give excellent results in most rooms. If you obtain the best performance. Installation Your 901 Series III speaker... your speakers and would like more information. SECTION VI (LIVING WITH YOUR BOSE 901 SPEAKERS) provides several additional suggestions for speaker placement. PLACING THE SPEAKERS Unlike conventional speakers, the 901 Series III functions with live performances. REFLECTING WALL tr-15' 16'-341" Figuru 1...
... Equalizer packed in placing the speaker cabinets will be obtained with the speakers placed between 12" and 24" from the reflecting wall. 2. Best results will give excellent results in most rooms. If you obtain the best performance. Installation Your 901 Series III speaker... your speakers and would like more information. SECTION VI (LIVING WITH YOUR BOSE 901 SPEAKERS) provides several additional suggestions for speaker placement. PLACING THE SPEAKERS Unlike conventional speakers, the 901 Series III functions with live performances. REFLECTING WALL tr-15' 16'-341" Figuru 1...
Owner's guide
Page 8
...wire (which is not Callkli/k! If two pairs of impedances on the bottom of BOSE 901 loudspeakers. d your amplifier, if there is a choice of 901 Series III loudspeakers are used, they Can be purchased without the equalizer These speakersare soldas ' add on the receiver or amplifier should be unable lo ... legmrud ci a Illamnen andlbte Mk/fallen ol 1 0 5 dlI I Niel a GA:Waled on the left channel amplifier output. (When connecting the 901 Series III loudspeakers to your receive/ Of aim/Shut is marked to distinguish one or two pairs of the speaker. Wire Selection If the wire used at...
...wire (which is not Callkli/k! If two pairs of impedances on the bottom of BOSE 901 loudspeakers. d your amplifier, if there is a choice of 901 Series III loudspeakers are used, they Can be purchased without the equalizer These speakersare soldas ' add on the receiver or amplifier should be unable lo ... legmrud ci a Illamnen andlbte Mk/fallen ol 1 0 5 dlI I Niel a GA:Waled on the left channel amplifier output. (When connecting the 901 Series III loudspeakers to your receive/ Of aim/Shut is marked to distinguish one or two pairs of the speaker. Wire Selection If the wire used at...
Owner's guide
Page 10
...terminal may be labeled PLAYBACK or TAPE IN.) d. Plug the ac power cord of your control amplifier so that the 901 equalizer is connected just like a tape recorder. • NOTE: Check your control equipment to the RIGHT or "8" channel TAPE RECORD connection of... or "B" channel tape monitor connection of a tape recorder. The equalizer can be turned on your high-fidelity system. CONNECTING THE EQUALIZER IT IS MOST IMPORTANT THAT YOU FOLLOW THESE INSTRUCTIONS FOR OPTIMUM PERFORMANCE OF YOUR 901 SERIES III SPEAKER SYSTEM. 1. Turn off with the power switch of your ...
...terminal may be labeled PLAYBACK or TAPE IN.) d. Plug the ac power cord of your control amplifier so that the 901 equalizer is connected just like a tape recorder. • NOTE: Check your control equipment to the RIGHT or "8" channel TAPE RECORD connection of... or "B" channel tape monitor connection of a tape recorder. The equalizer can be turned on your high-fidelity system. CONNECTING THE EQUALIZER IT IS MOST IMPORTANT THAT YOU FOLLOW THESE INSTRUCTIONS FOR OPTIMUM PERFORMANCE OF YOUR 901 SERIES III SPEAKER SYSTEM. 1. Turn off with the power switch of your ...
Owner's guide
Page 11
... check all connections. If the sound does not stop . NOTE 2: THE 901 SERIES III EQUALIZER IS NOT COMPATIBLE WITH THE 901 SERIES I . h. Place the TREBLE and MIDBASS controls at this position. If your control amplifier to be corrected before proceeding further. then the equalizer is on .) EQUALIZER AMPLIFIER CONNECTIONS 1-71 R TAPE RECORDER IT CONNECTIONS I TAPE CONTROL AMPLIFIER Figure...
... check all connections. If the sound does not stop . NOTE 2: THE 901 SERIES III EQUALIZER IS NOT COMPATIBLE WITH THE 901 SERIES I . h. Place the TREBLE and MIDBASS controls at this position. If your control amplifier to be corrected before proceeding further. then the equalizer is on .) EQUALIZER AMPLIFIER CONNECTIONS 1-71 R TAPE RECORDER IT CONNECTIONS I TAPE CONTROL AMPLIFIER Figure...
Owner's guide
Page 12
... • MAIN-AMPLIFIER 12 L INPUT OUTPUT Fiyur t: S PRE-AMPLIFIER The disadvantage of this connection method involves using conventional loudspeakers and headphones because the equalizer is suggested that the gain controls of your power amplifier be connected between separate preamplifier and power amplifier units (see Figure 6). However, this method of...Figure 5). Using the PREAMP-OUT/ MAIN-IN connection jacks retains the total flexibility of connecting the BOSE Active Equalizer makes use with one or two tape recorders in the conventional manner. Also, system noise may prove inconvenient...
... • MAIN-AMPLIFIER 12 L INPUT OUTPUT Fiyur t: S PRE-AMPLIFIER The disadvantage of this connection method involves using conventional loudspeakers and headphones because the equalizer is suggested that the gain controls of your power amplifier be connected between separate preamplifier and power amplifier units (see Figure 6). However, this method of...Figure 5). Using the PREAMP-OUT/ MAIN-IN connection jacks retains the total flexibility of connecting the BOSE Active Equalizer makes use with one or two tape recorders in the conventional manner. Also, system noise may prove inconvenient...
Owner's guide
Page 13
...is connected in connection jacks. Tape recorders are not used for the BOSE equalizer. Phase reversal occurs when the 901 equalizer is usually accomplished by Bose to the spatial and spectral properties of the 901 Series III system, optimum performance is obtained when all four speaker systems are ...required. However, if four 901's are now connected to the MAIN-IN terminals of...
...is connected in connection jacks. Tape recorders are not used for the BOSE equalizer. Phase reversal occurs when the 901 equalizer is usually accomplished by Bose to the spatial and spectral properties of the 901 Series III system, optimum performance is obtained when all four speaker systems are ...required. However, if four 901's are now connected to the MAIN-IN terminals of...
Owner's guide
Page 14
...recorder 5. • • V. NOTE: IF YOUR CONTROL AMPLIFIER HAS TWO TAPE MONITOR CIRCUITS, BE CERTAIN TO CONNECT YOUR TAPE RECORDER TO THE BOSE ACTIVE EQUALIZER, NOT TO THE UNUSED TAPE MONITOR ON YOUR RECEIVER. Connect the RIGHT channel TAPE OUT jack on the... the connection of the tape recorder. 4. TAPE RECORDERS Since the Active Equalizer is normally connected, extra jacks are provided on the equalizer to the LEFT or "A" channel INPUT (or LINE IN) jack on the 901 Active Equalizer in the MONITOR position (in). preamplifier, or receiver, where the tape recorder is ...
...recorder 5. • • V. NOTE: IF YOUR CONTROL AMPLIFIER HAS TWO TAPE MONITOR CIRCUITS, BE CERTAIN TO CONNECT YOUR TAPE RECORDER TO THE BOSE ACTIVE EQUALIZER, NOT TO THE UNUSED TAPE MONITOR ON YOUR RECEIVER. Connect the RIGHT channel TAPE OUT jack on the... the connection of the tape recorder. 4. TAPE RECORDERS Since the Active Equalizer is normally connected, extra jacks are provided on the equalizer to the LEFT or "A" channel INPUT (or LINE IN) jack on the 901 Active Equalizer in the MONITOR position (in). preamplifier, or receiver, where the tape recorder is ...
Owner's guide
Page 15
... and will sound unnatural with both channels al the tape output connections of your tape recorder. 2. place the tape monitor of your 901 equalizer in the monitor position (in Steps 2 and 3 of "Connecting Your Tape Recorder." 3. To play your tape recorder with your... conventional speakers or headphones) and your control amplifier has two tape monitor circuits, an additional connection procedure is important to realize that the BOSE Active Equalizer introduces substantial boost in the range below 100 Hz and above 4.000 Hz to both treble and bass being emphasized. Connect "le" connectors...
... and will sound unnatural with both channels al the tape output connections of your tape recorder. 2. place the tape monitor of your 901 equalizer in the monitor position (in Steps 2 and 3 of "Connecting Your Tape Recorder." 3. To play your tape recorder with your... conventional speakers or headphones) and your control amplifier has two tape monitor circuits, an additional connection procedure is important to realize that the BOSE Active Equalizer introduces substantial boost in the range below 100 Hz and above 4.000 Hz to both treble and bass being emphasized. Connect "le" connectors...
Owner's guide
Page 16
...• _-157.1.Sr • Will• ..MW.fI itlasollaap '1 1 SONS, TREBLE FREQUENCY CONTOUR CONTROL. The BOSE 901 Series III Active Equalizer addresses this problem with your room is also useful in particular, the mid-bass region, which can be dramatically affected by...program material (see SECTION C). MID-BASS FREQUENCY CONTOUR CONTROL. Similarly, if your BOSE 901Speakers A. to 260-Hz range. ADJUSTING YOUR EQUALIZER CONTROLS The 901 Series III equalizer has been completely redesigned with different settings of the speaker system upwards from the reflecting...
...• _-157.1.Sr • Will• ..MW.fI itlasollaap '1 1 SONS, TREBLE FREQUENCY CONTOUR CONTROL. The BOSE 901 Series III Active Equalizer addresses this problem with your room is also useful in particular, the mid-bass region, which can be dramatically affected by...program material (see SECTION C). MID-BASS FREQUENCY CONTOUR CONTROL. Similarly, if your BOSE 901Speakers A. to 260-Hz range. ADJUSTING YOUR EQUALIZER CONTROLS The 901 Series III equalizer has been completely redesigned with different settings of the speaker system upwards from the reflecting...
Owner's guide
Page 17
... sound produced by your speakers. instructions are encouraged lo use your BOSE dealer and are suspending a 35-pound speaker. If you decide to suspend the speakers from your amplifier tone controls and equalizer controls to adjust the sound for connecting and mounting the speaker system... to prevent possible ceiling or speaker damage. which allow low frequencies to accommodate the rubber feet supplied or for locating eyehooks for the 901 Series III and utilizes a four-hole mounting pattern. You will be used if available. DO NOT fasten these chainsinto a wood joist or adequate...
... sound produced by your speakers. instructions are encouraged lo use your BOSE dealer and are suspending a 35-pound speaker. If you decide to suspend the speakers from your amplifier tone controls and equalizer controls to adjust the sound for connecting and mounting the speaker system... to prevent possible ceiling or speaker damage. which allow low frequencies to accommodate the rubber feet supplied or for locating eyehooks for the 901 Series III and utilizes a four-hole mounting pattern. You will be used if available. DO NOT fasten these chainsinto a wood joist or adequate...
Owner's guide
Page 18
The system is connected in series. Percentages of speaker cabinet for maximum efficiency. 6. linear, high-excursion suspension; MID-BASS CONTOUR: Continuously adjustable slider with center detent; +3 dB. -5 dB ...; Speaker Configuration SPATIAL CHARACTERISTICS: Eight speakers reflecting sound at 40 Hz. Impedance: 8 ohms 3. TAPE MONITOR SWITCH: Replaces tape monitor switch on receiver or amplifier when equalizer is packed in most listening rooms) should provide more than adequate volume levels. Carton Dimensions: 25%" x 16" x I .0-volt output) Noise ("A" weighted): 85 ...
The system is connected in series. Percentages of speaker cabinet for maximum efficiency. 6. linear, high-excursion suspension; MID-BASS CONTOUR: Continuously adjustable slider with center detent; +3 dB. -5 dB ...; Speaker Configuration SPATIAL CHARACTERISTICS: Eight speakers reflecting sound at 40 Hz. Impedance: 8 ohms 3. TAPE MONITOR SWITCH: Replaces tape monitor switch on receiver or amplifier when equalizer is packed in most listening rooms) should provide more than adequate volume levels. Carton Dimensions: 25%" x 16" x I .0-volt output) Noise ("A" weighted): 85 ...
Owner's guide
Page 19
...110-220 VAC VOLTAGE CONVERSION The BOSE Series III Equalizer is designed to operate on one speaker sounds defective, DO NOT switch the speaker cables, as this manual. If you turn the volume down or switch the "Below 40" switch to be In the equalizer, be sure that the cables ...time to another line voltage, contact the closest BOSE Authorized Factory Service Agency or the BOSE factory (The speakers require no care, although they may damage the speaker operating correctly. CARE ANDMAINTENANCE Your 901 speaker cabinets and equalizer are connected properly and that the system operates...
...110-220 VAC VOLTAGE CONVERSION The BOSE Series III Equalizer is designed to operate on one speaker sounds defective, DO NOT switch the speaker cables, as this manual. If you turn the volume down or switch the "Below 40" switch to be In the equalizer, be sure that the cables ...time to another line voltage, contact the closest BOSE Authorized Factory Service Agency or the BOSE factory (The speakers require no care, although they may damage the speaker operating correctly. CARE ANDMAINTENANCE Your 901 speaker cabinets and equalizer are connected properly and that the system operates...