Download  Price List

and/or go to

Catalogue Site

 
Reiner E. Römer,
 roemer_bw[att)reromanus.net

Weidenstr.34b,

46149 Oberhausen, Germany

Fn: +49 208 6351070

Fx: +49 208 6351071

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40 Years of Manufacturing Electrostatic Loudspeakers 

 

Get back your DM 70 Hörgenuß


  • Repair, Refurbishment  and modifications,
     finishing and refining
     of the great  B&W Bowers & Wilkins DM70....

    ....we master these matters

    The B&W DM 70’s are a musically cohesive masterpiece.                           The Gramophone


  • And they are worth any effort to keep them running at its best. And to
    our opinion it is also an optical masterpiece, which deserves to be
    conserved as a fine piece of modern design.

 

  • The B+W DM 70 was my first Hi-Fi loudspeaker. I bought and imported
    it second hand from a London Hi-Fi dealer in 1974. From that time on
    I was immediately convinced 1.) of the ESL electrostatic loudspeaker in common,  2.) of the Bowers & Wilkins DM70 especially and last but not least 3.) of the ESL hybrids principle of sound reproduction.

 

  • Since that time I learned a lot about the special advantages and the special problems of the B&W DM70. Finally I knew all parts by heart and I was able to make my work on these loudspeakers with closed eyes. All in all I can look back on  having a 43 years experience with that special type of electrostatic loudspeaker model.   

 

? DM-70 wanted ? 

We nearly always do have some of these fine speakers for sale.
Naturally fully refurbished by us, means acoustically and technically like new or even better.  And  ten years of warranty

 Like this beautiful pair  below  for example. The average price for this mint item is about 2750€

 

If you are searching for a special finish or OEM version  of the B&W DM70, like e.g. the  special DM-70 SONY version or a white model,
give us a call and we will make a reservation for the next available item

We also have a special edition with upgrading features....

.. like this beautiful UK DM70_npu -version below (npu for "non plus ultra"), with heavy duty bass driver and optimized electronics. It is our top quality version of all DM70s ever.

 

 

This type is available and for sale from now on

DM70

 

We also are able to lacquer in all other desired finish or colour in our special lacquering workshop.

 

Coming with ten years of warranty !!

 

Re-animating and upgrading the B&W  DM 70

!Simply lift off the ESL panels and send your jewels in and, if you send the electronics unit as well, 

!Please do not follow the safety advice
like a DM70 possessor did on the photo below!
!!There are very much easier ways to
disconnect the unit from mains
supply  !!

 

Testimonial
James F., Ashford, Kent, UK


"Reiner, I managed to have a good night listening last night,
wow, really very impressed I wish I had got you to do the
work a long time ago. The only problem now is that I have
to go through my complete music collection as I need to hear
everything again.
They really do sound incredible,
the levels, the detail,
the depth, and sound stage are just awesome.
I was impressed before with
the speakers and never wanted to change them, now there is
nothing that will make me sell them.
I cannot say thanks enough Reiner for your work. I am even
leaving work on time which makes my wife happy.
James"

 

The above mentioned refurbished B&W DM70 has been refurbished by using the Shackman PP foil instead of PET with very new Shackman VLC coating. Furthermore  new internal cabling and copperless HV contacts have been used. The latter avoids contact corrosion.

.

Testimonial
Peter K., Germany

Nun funktioniert alles wieder! Klingen wunderbar.
Die Investition hat sich für mich wirklich gelohnt!

Sehr gute Arbeit! Von mir aus nochmals herzlichen Dank.


 


The very sensitive HVconnection

Hello Reiner,

Testimonial

after a long time my speakers are now  in perfect working condition once
again. 
Thank you very much they will  give us much enjoyment in the
coming years.

 


A panel to be refurbished as well as the one below


Testimonial

Herr Roemer

Nothing comes cheap and they play magnicifently again,
but now even
better. Great and thanks, beste grusse
Rien G.



Using double sided sticky tape, the result after some decades.
Believe it or not - it was still playing... without "light show".
Probably there are thousands of the  DM70 in this condition
running world  wide. Wonders could be given to their possessors' ears.

 

 

!Let us keep these jewels alive!

!Simply lift off the ESL panels and send them in!

 

Foam surrounds of bass driver

Nearly impossible to find a DM70 with surrounds in good health. Even if you think, or even see, the surrounds in good shape... once you touch them, they are pulverized to dust.

That leads to lack of bass reproduction and, even more it usually very swiftly results in a burnt voice coil and a dead bass driver.

We  fix and repair those broken foam surrounds of the DM70. As the chassis has an unusual diameter the spare foam is very difficult to get. We do  do have the right ones.


Exactly fitting spare "foam" surrounds

NOTA BENE: We do NOT repair destroyed/burnt  Bowers& Wilkins DM70 bass driver voice coils. But instead we have original spare bass drivers.

 

If you send in your bass drivers, please pack tem carefully and mount them in the way shown in the photo below.

hoe to arrange dm70 bass drivers for shipping

 

Further more, we have excellent alternative spare drivers which fully fit the original ones in physical size - but  electrically and  acoustically even better, and withe ever lasting surrounds.
Please ask for a quote for these extraordinary  spare bass drivers. It is from a  former 1st  class British driver manufacturer, producing for the greatest ones and for B&W as  well.  We are talking about the LEAK Sandwich Woofer

Leak Sandwich woofer

LEAK Sandwich Woofer, Upgrade bass driver for B&W DM70


DM70 with Leak Sandwich Woofer

DM70 UIK-Version with Leak Sandwich Woofer

 

Modifications on the B+W DM70? Why that??

There are not that much weak points in the Bowers and Wilkins DM70s
which are  crying for immediate change.

 No "usual" modifications would promise any improvement in a good
working DM-70.
Except perhaps some better interior speaker cable from the Input
unit to the bass crossover.
But in case that the bass has been damaged and replaced by an unsuitable
non  original one,  there may occur level discontinuities between bass driver and  ESL  tweeter panel. The only known  real improvement in  bass reproduction would be to replace the original driver with the famous
 LEAK SANDWICH WOOFER.


DM70 with Leak
DM 70  with  Leak Sandwich-woofer in  UK Version of the

 

A tweak to that would be a level attenuator for the MHT panel
and/or/or an
adjustable bias voltage in the very small range of about 100V to 200V.
That may allow an output variation of +/- 1,25dB. A very good way to improve the tweeter's sound reproduction quality is to add stiffeners to the back and front of the stators.
That  improves heavily the distortion values and result in  even more natural listening moments.

Stiffener for tweeter stators
Stiffeners for segments on DM70 tweeter panel
 

 

The royal road to approach a brand new, and even better than original,  B&W DM70 ESL Tweeter Unit

Technologically we  avoid three imminent weak points
of the B+Ws technical production solutions (other ESL brands as well).

 

1. The coating material and its resulting long time surface resistivity


2.The adhesive type (no "punctual" heat curing) and its mechanical attachment. No double sided sticky tape.


3. The physical contact area of HV voltage bias supply to the diaphragm.

 

These three reromanus modifications, or better actualizations with respect to former technological knowledge,  are true permanent assurances for an actual  longevity of the DM70 electrostatic panels.

   

The "Know-How-To"

Conclusion: Trust in our experience. You will be satisfied.

Repair of B&W Bowers & Wilkins DM70....

....we master these matters

   

!!Get a DIY DM 70 repair kit somewhere and try your luck ...


......or simply give the panels  to our jig!

 

 

Stretching Process in our Jig

 

Panel stretching with "Linear technology" devices.

 

DM70 in jig_pre-tensioned

The panel lifting device and the foil seen from below  towards the foil sky above

 

 

Stretching process.
The panel under the foil tent,  ready to be lifted.   

 

 

Coating and Masking


Masking for coating procedure with air pressure device


For getting new life to your DM 70, simply lift off the ESL tweeter panels and send them to our stretching jig

Have look at our VIDEO for how to  remove the tweeter panel from its wooden housing

removed panel from housing

 

Prices for  our refurbishment services  depend on overall status of the panels. No costs for checking. Best lasting results guaranteed. It will pay.  For details see price-list.

 

Some Version History of the B&W DM70


At least 2 different crossover Low pass versions


With two different response curves. Top >1972, bottom 1970-1972

 


3 different Panel HV short-cut protection versions

Different  PSUs


4 different EHT power units versions. other connectors and sockets, more and more fuses

 


This is serial No. mid 100 in our workshops for refurbishment . The very earliest version of the DM70 UK-version , enclosure still in mint shape, like brand new from factory, excellent B&W craftsmanship

 

No matter what age or serial number .., all refurbished DM70 will come out better  than original and at the latest electrical  and sound quality standards.

The B&W  DM 70 Continental for sale

Here you have a final view on a DM70 "Continental"  version at its best, refurbished and for sale ..... for you!!!

DM70 with leak sandwich woofer for sale

Or this fine upgraded UK-version with Leak Sandwich woofer

Technical and official Product Info

The original "1. Edition" 1970 manual with a remarkable essay of  Mr. Bowers on ESL loudspeakers can be downloaded here. (Courtesy J. Fox, U.K.)

The 1974 edition of the Bowers and Wilkins DM70 user manual can be downloaded  here.

 Shackman Catalog Site   Contact        Back to top  


You can also join the SHACKMAN  Discussion Group

Actual SHACKMAN auctions  Online


 

Shackman Catalog Site   MAIL-Contact                          Back to top

 

 

Speakers will be repaired by Reiner E. Römer

Other Corporate Links:

 

 reromanus Portal

 Shackman Info Site

 LS Literature Database

 Shackman Catalog Site

 Offers on eBay

 

     MAIL Contactt

DM70 tweeter Panel to be serviced

 

 

 

 

DM70 tweeter removed from enclosure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

broken pins

Bower&Wilkins DM70 broken pins

 

 

 

 

 

Your ESL will be repaired by Reiner E. Römer, Chief

f

Other Corporate Links:

 

 reromanus Portal

 Shackman Info Site

 LS Literature Database

 Shackman Catalog Site

 Offers on eBay

 

     Contact

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Your ESL will be repaired by  "Doc" Reiner E. Römer,

f

Other Corporate Links:

 

 reromanus Portal

 Shackman Info Site

 LS Literature Database

 Shackman Catalog Site

 Offers on eBay

 

     Contact

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Speakers will be repaired by  "Doc" Reiner E. Römer,

f

Other Corporate Links:

 

 reromanus Portal

 Shackman Info Site

 LS Literature Database

 Shackman Catalog Site

 Offers on eBay

 

     Contact

 

 

 


Reromanus Shackman