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Thread: CDM7 losing heights with age

  1. #1

    CDM7 losing heights with age

    Hello,

    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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    Hi

    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 http://www.whatsbestforum.com/showth...he-Right-Stuff

    Do let us know what happens

    Jack
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    Co-Founder and Managing Director PureSound PH - Exclusive Distributor (Philippines only) of Lamm, Von Schweikert Audio, CH Precision, Light Harmonic, Valvet, Townshend, Critical Mass Systems, EERA, KR Audio, Ambience SS, TechDAS, Master Built, Stromtank

  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
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    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, Soundlab A1 Px's while waiting for the XLF successor, EMT927, SME3012R, ARC Phono 3, Lamm ML1.2 Ref, Lamm L2ref, Stealth Dream speaker , Crystal Dreamline ICs, TA XL digital, TA XL gen V power cables, CenterStage footers and Nordost Qkore8's!

  5. #5
    Hi,

    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
    Hi,

    the Problem with B&W Tweeters is Ferrofluid in there it gets old this is why you lost High Frequencies.
    Here a DIY Repair....
    http://www.speakerrepairshop.nl/inde...n#.WpEMs4POW70

    or a new Pair..
    http://www.speakerrepairshop.nl/inde...n#.WpEQCoPOW70
    Best Regards,
    Stephan
    Customade Thorens 124 with Air Suspension
    TW-Acustic 10.5/Zyx Airy3x DIY 13"Arm Ortofon Vienna
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