Owner's guide
Page 1
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I it 1\k, f sw g.2 Owner's Manual ,e1 YF at E CO a) w ›.% cc VJ 1 05 Q. VVOrrie.°. rn a a) cC V.
Owner's guide
Page 2
... Controls C. Unpacking Instructions 3 III. Using 1-cur-Chanre IV. Connecting Other Equipment 12 A. Technical Information 17 A. Voltage Conversion C. Connecting the Equalizer 1. Covered by oaten: rights .ssued attS pert&ng. Installation 4 A. Using the Tape Monitor Circuit 2. Source and Room Compensation Controls B. Specifications B. Care and Maintenance VII. Fusing C. Room Acoustics VI. Living with your BOSE 901 Speakers 14 A. Warranty 19 r..; '978 DOSE Ccrpo•aticn. Using the Prea.rnp-OutiMain-Ir Czrou]l 4. Speaker Placement...
... Controls C. Unpacking Instructions 3 III. Using 1-cur-Chanre IV. Connecting Other Equipment 12 A. Technical Information 17 A. Voltage Conversion C. Connecting the Equalizer 1. Covered by oaten: rights .ssued attS pert&ng. Installation 4 A. Using the Tape Monitor Circuit 2. Source and Room Compensation Controls B. Specifications B. Care and Maintenance VII. Fusing C. Room Acoustics VI. Living with your BOSE 901 Speakers 14 A. Warranty 19 r..; '978 DOSE Ccrpo•aticn. Using the Prea.rnp-OutiMain-Ir Czrou]l 4. Speaker Placement...
Owner's guide
Page 3
... material for purchasing the BOSE 901 Series IV DirecUReflectinge speaker system. The active equalizer is the culmination of many years of research dedicated to the art of bringing superb musical reproduction into the home. If either of reflected sound, nine full-range drivers, and a newly-designed electronic active equalizer, is packed in this manual are important. I. With proper installation, you will experience is...
... material for purchasing the BOSE 901 Series IV DirecUReflectinge speaker system. The active equalizer is the culmination of many years of research dedicated to the art of bringing superb musical reproduction into the home. If either of reflected sound, nine full-range drivers, and a newly-designed electronic active equalizer, is packed in this manual are important. I. With proper installation, you will experience is...
Owner's guide
Page 4
... unique adjustments found on the 901 Series IV equalizer will be obtained with the speakers spaced apart 6' to 18" from the reflecting wall. 2. I listening area." Installation consists of the speaker toward the reflecting wall (the wall behind the speaker). The angled grille panels found on the enclosure are 3' to the ceiling or floor restrict the reflected sound energy. 3. Best results will give excellent results in the "Part 1" container...
... unique adjustments found on the 901 Series IV equalizer will be obtained with the speakers spaced apart 6' to 18" from the reflecting wall. 2. I listening area." Installation consists of the speaker toward the reflecting wall (the wall behind the speaker). The angled grille panels found on the enclosure are 3' to the ceiling or floor restrict the reflected sound energy. 3. Best results will give excellent results in the "Part 1" container...
Owner's guide
Page 6
... two pairs of your speaker system. c. Wire Selection If the wire used . The table below summarizes maximum wire lengths for future electronic Flevelopments and should be identical (see Figure 3) so that the amplifier connections for proper phasing of speakers. This wire usually has a ribbed line(s along one or two pairs of 901s are being connected, the terminal marked "4" or "4 ohms" on the left channel amplifier output. (When connecting the 901 Series IV...
... two pairs of your speaker system. c. Wire Selection If the wire used . The table below summarizes maximum wire lengths for future electronic Flevelopments and should be identical (see Figure 3) so that the amplifier connections for proper phasing of speakers. This wire usually has a ribbed line(s along one or two pairs of 901s are being connected, the terminal marked "4" or "4 ohms" on the left channel amplifier output. (When connecting the 901 Series IV...
Owner's guide
Page 7
... in an easily accessible location. If you are using an amplifier rated at under 100 watts rms per channel, fuse your speaker. BOSE Corporation recommends use of a fast-acting fuse in an easily accessible location. M'Jfv.: AMPLIFIER OR RECEIVER LEFT RIGHT CHANNEL OUTPUT CHANNEL OUTPUT POS COM POS COM + Figure3 Place the speaker marked "Part 2" on the right side of the room and repeat the connection procedure for part number 108938-3.
... in an easily accessible location. If you are using an amplifier rated at under 100 watts rms per channel, fuse your speaker. BOSE Corporation recommends use of a fast-acting fuse in an easily accessible location. M'Jfv.: AMPLIFIER OR RECEIVER LEFT RIGHT CHANNEL OUTPUT CHANNEL OUTPUT POS COM POS COM + Figure3 Place the speaker marked "Part 2" on the right side of the room and repeat the connection procedure for part number 108938-3.
Owner's guide
Page 8
... tape monitor circuitry. b. e. Plug the ac power cord of a tape recorder. Using one of the cables supplied with the equalizer, connect the LEFT channel OUTPUT of the equalizer to the section describing the connection of the equalizer into a "switched" ac outlet on your equipment. Installation C. CONNECTING THE EQUALIZER IT IS MOST IMPORTANT THAT YOU FOLLOW THESE INSTRUCTIONS FOR OPTIMUM PERFORMANCE OF YOUR 901 SERIES IV SPEAKER SYSTEM. 1. When using this...
... tape monitor circuitry. b. e. Plug the ac power cord of a tape recorder. Using one of the cables supplied with the equalizer, connect the LEFT channel OUTPUT of the equalizer to the section describing the connection of the equalizer into a "switched" ac outlet on your equipment. Installation C. CONNECTING THE EQUALIZER IT IS MOST IMPORTANT THAT YOU FOLLOW THESE INSTRUCTIONS FOR OPTIMUM PERFORMANCE OF YOUR 901 SERIES IV SPEAKER SYSTEM. 1. When using this...
Owner's guide
Page 9
... all connections, as any errors in the MONITOR position. NOTE 2: THE 901 SERIES IV AND III EQUALIZERS ARE NOT COMPATIBLE WITH THE 901 SERIES I TAPE RECORDER CONNECTIONS L A t A L R - Place both the LOW and HIGH FREQUENCY SOURCE AND ROOM COMPENSATION controls at this position. Set the LOW FILTER control in the NORMAL position. L1 OO Ant L- The sound should now return. h. Place the TAPE switch of the control's travel. i. Turn your control...
... all connections, as any errors in the MONITOR position. NOTE 2: THE 901 SERIES IV AND III EQUALIZERS ARE NOT COMPATIBLE WITH THE 901 SERIES I TAPE RECORDER CONNECTIONS L A t A L R - Place both the LOW and HIGH FREQUENCY SOURCE AND ROOM COMPENSATION controls at this position. Set the LOW FILTER control in the NORMAL position. L1 OO Ant L- The sound should now return. h. Place the TAPE switch of the control's travel. i. Turn your control...
Owner's guide
Page 10
... power amplifier input. MAIN-AMPLIFIER 10 Cassonsf INPUT 74RM/ISIIINMWRIM/0 R OUTPUT Figure 5 PREAMPLIFIER Also, system noise may not function if connected to the connection of connecting the BOSE Active Equalizer makes use with one or two tape recorders in the circuit; The disadvantage of this connection method involves using conventional loudspeakers and headphones because the equalizer is suggested that the gain controls of the preamplifier tape monitor...
... power amplifier input. MAIN-AMPLIFIER 10 Cassonsf INPUT 74RM/ISIIINMWRIM/0 R OUTPUT Figure 5 PREAMPLIFIER Also, system noise may not function if connected to the connection of connecting the BOSE Active Equalizer makes use with one or two tape recorders in the circuit; The disadvantage of this connection method involves using conventional loudspeakers and headphones because the equalizer is suggested that the gain controls of the preamplifier tape monitor...
Owner's guide
Page 11
...-AMP OUT CONTROL AMPLIFIER Figure 6 4. If two pairs of the 901 Series IV system, optimum performance is connected in connection jacks. Also, be repeated when using speakers having similar spatial characteristics, such as the Bose Direct/Reflectinge 601 or Model 501 speaker systems. These speaker systems have four-channel tape monitor or preamp out/main in the circuit. These connection jacks can be used , two active equalizers are required. For the channels operating the conventional speakers, use...
...-AMP OUT CONTROL AMPLIFIER Figure 6 4. If two pairs of the 901 Series IV system, optimum performance is connected in connection jacks. Also, be repeated when using speakers having similar spatial characteristics, such as the Bose Direct/Reflectinge 601 or Model 501 speaker systems. These speaker systems have four-channel tape monitor or preamp out/main in the circuit. These connection jacks can be used , two active equalizers are required. For the channels operating the conventional speakers, use...
Owner's guide
Page 12
... place the TAPE switch on the equalizer to the LEFT or "A" channel OUTPUT jack of the tape recorder is connected to the RIGHT or "B" channel INPUT (or LINE IN) jack of a tape recorder. Connecting Other Equipment A. Turn all power off. 2. Similarly, connect the LEFT channel TAPE OUT jack on the tape recorder. 3. Connect the RIGHT channel TAPE IN jack on the 901 Active Equalizer in the MONITOR position (in). Installation of the...
... place the TAPE switch on the equalizer to the LEFT or "A" channel OUTPUT jack of the tape recorder is connected to the RIGHT or "B" channel INPUT (or LINE IN) jack of a tape recorder. Connecting Other Equipment A. Turn all power off. 2. Similarly, connect the LEFT channel TAPE OUT jack on the tape recorder. 3. Connect the RIGHT channel TAPE IN jack on the 901 Active Equalizer in the MONITOR position (in). Installation of the...
Owner's guide
Page 13
... played with the equalizer in the circuit, will sound unnatua with your control amplifier has two tape monitor circuits, an additional connection procedure is important to switch the Active Equalize out of the circuit by placing the tape monitor switch of your control amplifier on your high-fidelity system and will then be connected directly to your control amplifier. 4. tAny speaker system other than the BOSE III or IV system...
... played with the equalizer in the circuit, will sound unnatua with your control amplifier has two tape monitor circuits, an additional connection procedure is important to switch the Active Equalize out of the circuit by placing the tape monitor switch of your control amplifier on your high-fidelity system and will then be connected directly to your control amplifier. 4. tAny speaker system other than the BOSE III or IV system...
Owner's guide
Page 14
... new performance is the new I driver used with the 901 Series IV. Regardless of the acoustics of listening room acoustics. Currently available tone controls found on speaker performance with a new equalizer design that provides up to vary dramatically as a function of your listening room. This new driver assembly has an improved efficiency in high-frequency efficiency, and high-power handling capabili- plications, providing the fusing...
... new performance is the new I driver used with the 901 Series IV. Regardless of the acoustics of listening room acoustics. Currently available tone controls found on speaker performance with a new equalizer design that provides up to vary dramatically as a function of your listening room. This new driver assembly has an improved efficiency in high-frequency efficiency, and high-power handling capabili- plications, providing the fusing...
Owner's guide
Page 15
... the attractive pedestals available wit the 901 Series IV System. This placement method i particularly attractive if wall surfaces are interrupted by wir dows or doorways or if floor placement is important to suspend the speaker syster from the ceiling (see Figure 1). B. ADJUSTING THE LOW AND HIGH FREQUENCY SOURCE AND ROOM COMPENSATION CONTROLS 1. You will result in the center. 3. acoustic feedback can be used .
... the attractive pedestals available wit the 901 Series IV System. This placement method i particularly attractive if wall surfaces are interrupted by wir dows or doorways or if floor placement is important to suspend the speaker syster from the ceiling (see Figure 1). B. ADJUSTING THE LOW AND HIGH FREQUENCY SOURCE AND ROOM COMPENSATION CONTROLS 1. You will result in the center. 3. acoustic feedback can be used .
Owner's guide
Page 16
.... This is supplied with the center terminal found on your high-fidelity system. The unique controls on the 901 Series Ill and IV Loud• speaker. The overly bright sound of the rear chain(s) holding the speaker system in the quality of the speaker. A supporting chain should be attached to a structural support, such as the size, shape, construction, and furnishings) play an important part in place.
.... This is supplied with the center terminal found on your high-fidelity system. The unique controls on the 901 Series Ill and IV Loud• speaker. The overly bright sound of the rear chain(s) holding the speaker system in the quality of the speaker. A supporting chain should be attached to a structural support, such as the size, shape, construction, and furnishings) play an important part in place.
Owner's guide
Page 17
... monitor switch on amplifier size when used in series. VI. The system Is packed in tape monitor circuit. Percentages of the reflected sound incident upon the listener. Power Handling Minimum Recommended Power: 10 watts rms per channel at 16 kHz (center setting) 17 SOURCE AND ROOM COMPENSATION LOW FREQUENCY CONTROL: Continuously adjustable slider, mt 8 dB adjustment over band from the wall behind the speaker; Dimensions: Input impedance: Harmonic distortion: Noise ("A" weighted): Minimum load impedance: Maximum output...
... monitor switch on amplifier size when used in series. VI. The system Is packed in tape monitor circuit. Percentages of the reflected sound incident upon the listener. Power Handling Minimum Recommended Power: 10 watts rms per channel at 16 kHz (center setting) 17 SOURCE AND ROOM COMPENSATION LOW FREQUENCY CONTROL: Continuously adjustable slider, mt 8 dB adjustment over band from the wall behind the speaker; Dimensions: Input impedance: Harmonic distortion: Noise ("A" weighted): Minimum load impedance: Maximum output...
Owner's guide
Page 18
... operation. Grille cloths generally require no voltage conversion.) C. Technical Information B. 110.220 VAC VOLTAGE CONVERSION The BOSE Series IV Equalizer is designed to operate on one speaker sounds defective, DO NOT switch the speaker cables, as this manual. D. Instead, disconnect the wire of the speaker suspected of the system is defective. This can generally be carefully vacuumed if necessary. 18 what part of being defective at high sound levels...
... operation. Grille cloths generally require no voltage conversion.) C. Technical Information B. 110.220 VAC VOLTAGE CONVERSION The BOSE Series IV Equalizer is designed to operate on one speaker sounds defective, DO NOT switch the speaker cables, as this manual. D. Instead, disconnect the wire of the speaker suspected of the system is defective. This can generally be carefully vacuumed if necessary. 18 what part of being defective at high sound levels...
Owner's guide
Page 19
...without charge for service instructions. Alternatively, you may elect to receive a refund or replacement, but only if the unit is not covered by the transportation companies. IN NO EVENT SHALL BOSE BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. If you at BOSE's expense. This warranty gives you specific legal rights, ...and will remedy all liens and other proof of purchase to you need a new carton, your nearest BOSE dealer for parts or labor, upon return of the unit together with proof of purchase to BOSE or to exterior appearance. The dealer may not apply to damage...
...without charge for service instructions. Alternatively, you may elect to receive a refund or replacement, but only if the unit is not covered by the transportation companies. IN NO EVENT SHALL BOSE BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. If you at BOSE's expense. This warranty gives you specific legal rights, ...and will remedy all liens and other proof of purchase to you need a new carton, your nearest BOSE dealer for parts or labor, upon return of the unit together with proof of purchase to BOSE or to exterior appearance. The dealer may not apply to damage...
