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Thread: B&W DM2 fettling

  1. #91
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    There's not much around capable of use in a larger room at that sort of money. You might find some vintage Goodmans Magnum K2 or Wharfedale Dovedale III in usable condition, both are sensitive and don't need loads of power to go loud. Good punchy bass on these with the 12 inch drivers. Both a bit of a classic of their time.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  2. #92
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 37,779
    I'm Martin.

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    Quote Originally Posted by florin View Post
    could you come up with some examples that would be a good match for the Sansui 881's 60wpc?
    Although I like the MA Studio 2 in the videos, unfortunately they're not suitable for a large room as they also lack bass even though for a smaller room they would be a good match.
    I'm looking at a budged between 100 - 200$ preferably something more vintage so that I would hopefully get a good deal. Got these DM2's for £50 with a bit of luck lol. MA Studio 2 paid £72 for them but had to change the twitter foils. MA R352 £30. You get the point, bargain hunter lol
    KEF Calinda for £170 here https://www.ebay.co.uk/itm/255277855...Condition=3000

    They like a big room and your amp will have no bother driving them.
    Current Lash Up:

    TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.

  3. #93
    Join Date: Jan 2022

    Location: Sunbury on Thames, UK

    Posts: 31
    I'm Florin.

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    I've decided to keep the DM2's but I'm looking to upgrade the main mid-bass drivers DW 200/2.
    Currently looking at these 8" JBL mid-bass drivers on eBay that were fitted in their Professional 3310 cinema speaker setup.
    It's a 2 way speaker design with crossover frequency at 2.5kHz just as the DM2 and a frequency range between 40hz to 20.000kHz.
    Screenshot 2022-11-06 at 22.29.47.jpgScreenshot 2022-11-06 at 22.31.38.jpg
    https://www.ebay.co.uk/itm/144765884...-desc-maincntr

    Another option seems to be 8" Dalesford bextrene from the 70's.

    Does anyone have any experience with upgrading the mid-bass driver of B&W's DM2?

  4. #94
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,481
    I'm Alex.

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    Quote Originally Posted by florin View Post
    I've decided to keep the DM2's but I'm looking to upgrade the main mid-bass drivers DW 200/2.
    Currently looking at these 8" JBL mid-bass drivers on eBay that were fitted in their Professional 3310 cinema speaker setup.
    It's a 2 way speaker design with crossover frequency at 2.5kHz just as the DM2 and a frequency range between 40hz to 20.000kHz.
    Screenshot 2022-11-06 at 22.29.47.jpgScreenshot 2022-11-06 at 22.31.38.jpg
    https://www.ebay.co.uk/itm/144765884...-desc-maincntr

    Another option seems to be 8" Dalesford bextrene from the 70's.

    Does anyone have any experience with upgrading the mid-bass driver of B&W's DM2?
    I looked at using the DM2 bass unit in my LS3/6 but found it too coloured in the mid, the Dalesfords were better in this respect. Also tried the DM4 bass unit, similar problem.

    Although coloured in the mid, the DM2 bass unit works quite well in the DM2, same applies to he DM4 unit in the DM4.

    Not sure of any differences (if any) between DM2 and DM2A bass units.
    Spendorman

  5. #95
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,481
    I'm Alex.

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    Quote Originally Posted by florin View Post
    I've just bought a pair of B&W DM2 a few weeks back.

    I've put them through my Sansui 881 which is a 60wpc amp and I feel that the sound is somewhat closed and shunned?!? Also when pushed past 60% of volume the bass drivers start distorting. I figured out that the moving coil is hitting the back of the driver enclosure as it has little play in it. It might have been designed this way to limit the amount of volume is being pushed into them?!? Maybe?!?
    Upon opening them up it looks like the DW200 bass driver have ben replaced ( with newer driver "tested may 1993") however they seem to have been replaced with like for like as they look identical to the original ones (which are not painted black) and fit perfectly into the panel but I wonder if the original DW 200 have the same limited play distance in the speaker coil.
    I've put up some video to show them off.

    1. B&W DM2 vs Monitor Audio Studio 2 vs Monitor Audio System R352
    https://www.youtube.com/watch?v=P4BsrmC2I2E
    2. B&W DM2 vs Monitor Audio Studio 2 vs Monitor Audio System R352
    https://www.youtube.com/watch?v=6p-FflpamP4

    3. B&W DM2 vs Monitor Audio Studio 2 vs Sony SS 1005 (B&W made)
    https://www.youtube.com/watch?v=wLN0rJYxoUM
    4. B&W DM2 vs Monitor Audio Studio 2 vs Sony SS 1005 B&W made
    https://www.youtube.com/watch?v=_w6q234xG4k&t=21s

    B&W DM2 speaker cone hitting the back magnet / casing
    https://www.youtube.com/watch?v=nnuDfqB63_A

    B&W DM2 A Speakers - What's on the inside.
    https://www.youtube.com/watch?v=LnlNECMq3NI

    These speakers are totally different designs yes, but I'm just finding my way around the hi-fi world trying out different things.
    I wonder if anyone can tell from the last video whether the green capacitors, or whatever they are, they look out of shape due to ageing and if their upgrade / replacement would make any meaningful difference.
    Here's a picture of the crossover of the other speaker I've just opened today.

    Attachment 30215

    Been trying to remove the plastic knob from the HF potentiometer at the back now but it feels as though it's impossible to pull it out. I've sprayed tome WD forty at the base with the hope to loosen it up but no success, and I've been pulling hard on it. I will be taking the pliers to give it a little squeeze to see if that works.
    I believe that the DM2 bass unit shown in the video is faulty. Possibly a damaged voice coil/ former.
    Spendorman

  6. #96
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,481
    I'm Alex.

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    Quote Originally Posted by Mr Kipling View Post
    Apologies for replying to a very old post, but I believe that this crossover might be from DM2 Mk2, very different to DM2 crossover.
    Spendorman

  7. #97
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    The suggested JBL bass driver would at least need to match the DM2 unit in exact dimensions, sensitivity, impedance curve and tonal characteristics to be a compatible substitute. I think this would be unlikely.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  8. #98
    Join Date: Jan 2022

    Location: Sunbury on Thames, UK

    Posts: 31
    I'm Florin.

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    Quote Originally Posted by spendorman View Post
    I believe that the DM2 bass unit shown in the video is faulty. Possibly a damaged voice coil/ former.
    Don't know whether damaged voice coil or limiting design. It does play well without distortion until it hits the back plate.
    It comes to an abrupt end which means that the travel distance is too short. The rubber surround is narrower which gives it less flexibility (maybe this has been done in purpose?!?). On the plus side, the magnet is at least 750g heavier as the chassis is identical to that of the B&Ws DW200.

    I was thinking whether it's worth taking them apart to replace the rubber surround with a wider one and add a thick metal ring / plate between the magnet and the existing back plate in order to widen the travel distance of the cone / core tube assembly.
    If anyone has experience with refurbishing drivers maybe they could let me know whether such upgrade would be possible or make sense.

    close-up view of the driver
    https://youtu.be/MIXDwRNceNo

    in operation
    https://youtu.be/Lv4HPK8inoY

  9. #99
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,481
    I'm Alex.

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    Quote Originally Posted by florin View Post
    Don't know whether damaged voice coil or limiting design. It does play well without distortion until it hits the back plate.
    It comes to an abrupt end which means that the travel distance is too short. The rubber surround is narrower which gives it less flexibility (maybe this has been done in purpose?!?). On the plus side, the magnet is at least 750g heavier as the chassis is identical to that of the B&Ws DW200.

    I was thinking whether it's worth taking them apart to replace the rubber surround with a wider one and add a thick metal ring / plate between the magnet and the existing back plate in order to widen the travel distance of the cone / core tube assembly.
    If anyone has experience with refurbishing drivers maybe they could let me know whether such upgrade would be possible or make sense.

    close-up view of the driver
    https://youtu.be/MIXDwRNceNo

    in operation
    https://youtu.be/Lv4HPK8inoY
    I have had 4 pairs of DM2 / DM2a, none have been like this. Still have three pairs.

    Does the other speaker do this?

    Still reckon damaged unit.

    Could be that unit was assembled with wrong coil/ former, or just badly assembled.
    Spendorman

  10. #100
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,481
    I'm Alex.

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    I bought my first pair of DM2's about 17 years ago for £50, the guy selling had just bought a large pair of PMC's, he did a comparison for me, the DM2's stood up very well. I thought to myself that I'd rather have the DM2's and the remaining cash than the PMC's.
    Spendorman

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