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I have Bose 701 II speakers with an active subwoofer built in the left speaker. Very recently (after 6 years if use), it stopped working. 1- I tested the power cable connected and it works. 2- Even if I am sure that electric power is reaching, there is no sign that subwoofer gets it. Looks like a fuse went off. Nothing happens when I turn on or off the power switch on the unit. It may be a fuse went off but do not know where to check... I am a good handyman and can get it fixed if I know where to look at.

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  • cenktukel Nov 20, 2009

    Thank you for your reply...
    Can you pls help with some more questions:

    1) Is this a generic answer or a well studied answer for the Bose 701 II speakers?
    2) If this is specific to Bose 701 II speakers (which has the subwoofer built in the left speaker box), how can I remove the speaker out of the box?

    Thank you,

  • cenktukel Nov 23, 2009

    Yes, they do have a separate power supply and as I said before; the subwoofer was working until recently (for the last 5 years) and stopped working couple of weeks ago all of a sudden.

  • cenktukel Nov 26, 2009

    Thank you... The fuse was the issue and replacing it solved the problem. I just did not know how to get to the fuse and you helped me. Thank you :-)



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If there is no fuseholder at the back then you will have to remove they power amp unit along with the power supply ***`y. You`ll find the fuse inside by following the power cord, usually on a fuse holder, that is the primary side of your power supply. On the secondary side of that transformer and mounted on the board you may also find two or more d.c line fuses. Try and replace them with the same value but if they blow right back then you have a power amp problem or a short in the power supply. Don`t forget to unplug before getting your fingers in there.
Hope this will help. Good luck

Posted on Nov 24, 2009

  • Jacques Marin
    Jacques Marin Nov 26, 2009

    Hi cenktukel
    I`m glad that it fixed your problem.
    Would have but surprised that it would be otherwise because of your speakers protection circuit.
    To answer your first question , lets say that it can be generic to all powered subs, and although i know the design of your system i never had the chance to work on them(too good a design i guess).

    For your second question; All i can tell you is that you have an 8" sub in each of the boxes and unless you have a problem with them , it might be a good idea not to break the seal or loosen them up.

  • Jacques Marin
    Jacques Marin Nov 26, 2009

    About the sub.
    We talking about high pressure sound level where even the type of glue used to mount the cabinet will affect the sound, so any loosening may end up in a rattle later on.


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Do the speakers have a separate power supply? Check to see if you have the proper voltage comming from the P/S.

Posted on Nov 21, 2009

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Check all of your speaker wiring connections, even take the speaker out of it's box and make sure all of the connections are solid. make sure your amp is turning on and your rca cable is plugged into the radio head unit and the amp. if all else fails, remove the speaker from the box, and to check if the speaker is actually dead, take a 9v battery and connect the + terminal to the + terminal on the sub and do the same for the -. the sub will make a popping noise every time you touch them together.

This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

Posted on Nov 14, 2009

  • charlymonty Nov 24, 2009

    check out for the fuse on the power supply board of the speaker/woofer as there is a safety fuse located on the power supply board to save the board if any short circuit occurs.if the fuse blows the power supply stops working and replacing the fuse solves the issue.but if the fuse is ok then it can be problem of amp IC on the board.the ic needs replacement.but for amp ic replacement the board needs to be checked by meter to locate the short on the board.other if you directly replace the ic it will again get blown out due to short in the board.
    if you are not familiar
    with doing this you can get it done by local electronics repair technician familiar with
    this model.


    This will help. Thanks please keep updated.please do rate the solution positively .thank
    you for using fixya

  • charlymonty Nov 26, 2009

    thanks for keeping updated.good to hear that it worked.

    please do rate the solution positively .thank you for using fixya.


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