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Thread: CDM7 losing heights with age

  1. #1

    CDM7 losing heights with age


    I have a 20 year old pair of CDM7 which I used intensively in the first 10 years, then sporadically in the following 5, and almost not in the past 5 years.

    Recently I decided to use them again, and I was hugely disappointed to find out that they are missing a lot of the high range frequencies. Low end is still fine bit high end seems muffled.

    Is there any known problem with them, like not ageing well? The tweeters or the crossover?

    Thanks for sharing your experience.

  2. #2
    [WBF Founding Member] Addicted to Best! JackD201's Avatar
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    Apr 2010
    Manila, Philippines

    The first thing I would do is to clean their terminals as well as the jumpers if you use them. Some great tips from our own Tom Mallin her

    Do let us know what happens

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  3. #3
    Hi, thanks for your suggestion. I'll try that later today. Will keep you informed.

  4. #4
    VIP/Donor [VIP/Donor] microstrip's Avatar
    Join Date
    May 2010
    Try connecting the speaker cables just to the two upper terminals - if there is no sound there is a problem with the tweeters.

    Sometimes people loose the jumpers when they disconnect the speakers - are they in the proper place, well screwed?
    DCS Vivaldi 2.0 stack, Metronome Kalista / Kondo KSL DAC, Soundlab A1 Px's , EMT927, SME3012R, ARC Phono 3, ARC REF40, VTL Siegfried II, TA Opus MM2 speaker and signal, TA XL digital, TA XL gen V power cables, CenterStage footers and Nordost Qkore8's!

  5. #5

    so I cleaned the terminals and the jumpers, reconnected everything, well screwed everything. Sadly it made no difference.

    I also tried wiring only the tweeters as suggested, and they work.

    There is another possibility for the muffled sound, not sure though:
    The room the CDM7 stand in is only about 12m2 (around 130 square foot), and I believe it's just too much bass for such a small room, which makes the heights sound under-represented.
    Also it's quite impossible the place the speakers correctly which enough distance from the walls in such a small room.

    The issue still could result from capacitors in the crossover gone bad (old, dried out) though.

    I have a pair of DM600 S3 which I use for now, and they sound more balanced in that small room, of course much less powerful in the lower end.

    I'll keep on analysing. Maybe I'll move the CDM7 to a bigger room the weekend to check how they sound there.

    Thanks everyone for their suggestions.

  6. #6

    the Problem with B&W Tweeters is Ferrofluid in there it gets old this is why you lost High Frequencies.
    Here a DIY Repair....

    or a new Pair..
    Best Regards,
    Customade Thorens 124 with Air Suspension
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