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Bose 901 Series IV Support Question

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Question posted by octoman13 on January 17th, 2022

I Want S Service Manual For 901 Iv Ver 1

I need to find the cause of a distorted sound in my left channel of my 901 series IV version 1 active equalizer. I would like to determine the source of the midrange or higher frequencies. That appears to be the noticeably muddy sounds or distorted sounds. It has been a few years since I have had them connected so my memory may be accurate so there is the possibility of a the speaker, however, from what I remember the cones do not appear to have any physical damage. Then my question, is there electrical circuitry in the speaker cabinet? So, my thinking it is the equalizer and need the service manual to check possibilities of malfunctioning of the device. If there is a service manual available on line I would appreciate finding a free downloadable version. I have a a service manual for the 901 I and II but not for the 901 series IV version 1 that I have. Thanks

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Answer #1: Posted by SonuKumar on January 17th, 2022 7:47 AM

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Related Bose 901 Series IV Manual Pages

Owner's guide - Page 1

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Owner's guide - Page 2

... 2. Fusing C. Care and Maintenance VII. Table of Difficulty D. Connecting the Equalizer 1. Room Acoustics VI. Technical Information 17 A. Using the Prea.rnp-OutiMain-Ir Czrou]l 4. Living with your BOSE 901 Speakers 14 A. Source and Room Compensation Controls B. Speaker Placement D. Specifications B. Covered by oaten: rights .ssued attS pert&ng. Using...

Owner's guide - Page 3

... TAKE THE TIME TO READ THESE INSTRUCTIONS CAREFULLY. The active equalizer is installed, connected, and operated differently than conventional loudspeakers. Repack the speaker(s) in this manual are important. The BOSE 901 Series IV, with its high proportion of reflected sound, nine full-range drivers, and a newly-designed electronic active equalizer, is found in the original carton with the...

Owner's guide - Page 4

Installation Your 901 Series IV speaker system consists of three parts: two speakers (marked "Part 1" and "Part 2") and an electronic Active Equalizer packed in most rooms. If you have not decided where to place your speakers and would like more information, SECTION V (LIVING WITH YOUR BOSE 901 SPEAKERS) provides several additional suggestions for best sound, 2) connecting the speaker to your ...

Owner's guide - Page 6

... a maximum audible cdorahon of the speaker. Place it on the left speaker to detect any coloration introduced by as much resistance, audible coloration of the sound and loss of 901 Series IV loudspeakers are used .)11- c. If two pairs of power can be purchased without the equalizer. Connect the " + " terminal on the left channel output of the amplifier or receiver...

Owner's guide - Page 7

... of a 3ampere, fast-acting Buss AGC Series or Littelfuse AG Series. Be sure to the speaker connection diagram, the fuseholders should be inserted in the positive wire connecting each speaker, placing the fuse in an easily accessible location. Ask for $5.00. M'Jfv.: AMPLIFIER OR RECEIVER LEFT RIGHT CHANNEL OUTPUT CHANNEL OUTPUT POS COM POS COM + Figure3 Amplifiers...

Owner's guide - Page 8

... or "6" channel TAPE RECORD connection of your control amplifier. fro make connection easier, we are unclear, it were a tape recorder, using the tape monitor connections of your control amplifier. Consult your control amplifier; CONNECTING THE EQUALIZER IT IS MOST IMPORTANT THAT YOU FOLLOW THESE INSTRUCTIONS FOR OPTIMUM PERFORMANCE OF YOUR 901 SERIES IV SPEAKER SYSTEM. 1. When...

Owner's guide - Page 9

... TAPE MONITOR or TAPE FUNCTION switch of the control's travel. I AND II SPEAKER SYSTEMS. HOWEVER, THE 901 SERIES IV EQUALIZER IS COMPATIBLE WITH THE 901 SERIES III SPEAKER SYSTEM. 9 The sound should stop , recheck Steps "a" through "I . NOTE 1: THE TAPE MONITOR OF YOUR CONTROL AMPLIFIER MUST BE LEFT "ON" FOR THE ACTIVE EQUALIZER TO BE IN THE CIRCUIT. plifier and observe that the...

Owner's guide - Page 10

...Figure 5). EQUALIZER AMPLIFIER n CONNECTIONS TAPE RECORDER CONNECTIONS II rT , C) 0 A. Using the Preamp•Out/Main-ln Circuit An alternate method of connecting the BOSE Active Equalizer makes use... connects the equalizer in this method of the tape monitor circuitry. The disadvantage of this connection method involves using conventional speakers or headphones. (See SECTION IV.) Due to...

Owner's guide - Page 11

...-IN terminals of the 901 Series IV system, optimum performance is usually accomplished by Bose 'to match the 901 system when used for the rear channels. With this manual before proceeding. NUT R L MAIN-AMP IN a PRE-AMP OUT CONTROL AMPLIFIER Figure 6 4. OUT terminals to the equalizer INPUT terminals, and connect the EQUALIZER OUTPUT terminals to determine the proper phase...

Owner's guide - Page 12

... CONNECTIONS TAPE RECORDER CONNECTIONS L 0 0 0 0 NiPl1- Refer to the LEFT or "A" channel INPUT (or LINE IN) jack on the 901 Active Equalizer in the MONITOR position (in). Connect the RIGHT channel TAPE IN jack on the equalizer to the RIGHT or "B" channel OUTPUT jack on the equalizer to the RIGHT or "B" channel INPUT (or LINE IN) jack of the tape recorder...

Owner's guide - Page 13

... is important to realize that the BOSE Active Equalizer it troduces substantial boost in the OFF or NORMAL position when playin conventional speakers or headphones with both channels at the tape output connections of the 90 speakers. If you . Connect "Y" connectors to your high-fidelity system and will sound unnatua with your BOSE dealer concerning the...

Owner's guide - Page 14

...make the 901 Series IV speaker system unusually flexible with two new controls called Source and Room Compensation Controls. The HIGH FREQUENCY CONTROL is a shelving function that are primarily designed around established circuits. plications, providing the fusing recommendations in non-commercial ap- The new 901 Series IV equalizer addresses this problem with the 901 Series IV. BOSE has...

Owner's guide - Page 15

... pedestals available wit the 901 Series IV System. Another placement idea is deep enough to its effect. Select a well-recorded familiar record with a full orchestral passage or a record with the control at the extreme left , slowly move the knob until the sound fills with the pedestals for connectin and mounting the speaker system, using the four...

Owner's guide - Page 16

... which allow low frequencies to operate with the center terminal found on the 901 Series Ill and IV Loud• speaker. ROOM ACOUSTICS The acoustical properties of the room (such as shelves or tables. The overly bright sound of thin panel construction...a covered surface or rug. •Please note that the speaker is done by your 901 IV Equalizer are especially helpful in place.

Owner's guide - Page 17

...The Active Equalizer TAPE MONITOR SWITCH: Replaces tape monitor switch on amplifier size when used in tape monitor circuit. SPECIFICATIONS 1. The Speaker Dimensions: 21" Wide x 12%" High x 13" Deep Weight: 35 lbs. SPEAKER COMPLEMENT: Nine matched full-range speakers, utilizing aluminum helically wound voice coils; SOURCE AND ROOM COMPENSATION LOW FREQUENCY CONTROL: Continuously...

Owner's guide - Page 18

... are connected properly and that sounded defective now plays correctly, the difficulty is not in the speakers or in the circuit. Technical Information B. 110.220 VAC VOLTAGE CONVERSION The BOSE Series IV Equalizer is defective. If bass and high frequencies seem weak, check to 240 volt operation except by disconnecting the equalizer from the circuit. This can...

Owner's guide - Page 19

... installation, misuse, neglect or abuse, or to exterior appearance. Some states do so, you to return the unit together...by the warranty and will not be free from the BOSE Customer Service Department, 100 The Mountain Road, Framingham, Massachusetts 01701. 2. Should...a "Return Authorization" number from defects in transit due to you need a new carton, your nearest BOSE dealer for a period of...