the home of the turntable

DM2a Manual

speakers and headphones

DM2a Manual

Postby poppers » 19 Jan 2009 14:20

Does anyone have a manual or information on the Bowers and Wilkins DM2a Transmission Line speaker. I have just picked a pair of these up.

Regards
P
poppers
senior member
 
Posts: 111
Joined: 12 Aug 2008 13:34
Location: UK

DM2a manual

Postby Big Ears » 19 Jan 2009 16:22

Yes, I do, and I have been threatening to upload it for a while (actually, there are two - each unit comes with its own manual and measured response curve) ... I'll take this as a gentle reminder.
BE
Big Ears
contributor
 
Posts: 14
Joined: 19 Apr 2008 06:12
Location: Cape Town, South Africa

Postby poppers » 19 Jan 2009 19:29

ah that would be great. Do you have these speakers?
poppers
senior member
 
Posts: 111
Joined: 12 Aug 2008 13:34
Location: UK

DM2A Speakers

Postby vinylspinner » 19 Jan 2009 22:42

Hi guys,

I have a pair of these for sale, plus spare drive units / crossovers etc, great speakers but no longer wife friendly, any offers considered, also have manuals if still required.
vinylspinner
junior member
 
Posts: 18
Joined: 28 May 2003 09:25
Location: WILTSHIRE, ENGLAND

Postby poppers » 19 Jan 2009 23:38

I'm just after a copy of the manual. And any other infomation really, like where they prefer being placed, stands or not, that kind of thing.
poppers
senior member
 
Posts: 111
Joined: 12 Aug 2008 13:34
Location: UK

DM2a manual

Postby Big Ears » 20 Jan 2009 10:37

Yes, I have a pair and they are my main speakers. Here are a couple of thoughts about placement.

Firstly, remember that the drive unit line-up is upside down compared with the conventional: the bass unit goes on top. The transmission line vent is at the bottom.

According to the manual, they are designed to be used closer to rear walls than typical speakers of their type and size. In my experience this doesn't necessarily mean they like to be close to the rear wall. Their already powerful bass can be quite overpowering in these conditions.

I've also got the B&W dedicated stands. They look nice and 70s, but I prefer my own stands made of square-section tubing. The boxes may be placed vertical or horizontal. (I've never tried horizontal.) There's an alternative floor-mount method using a sloped miniature stand that angles the sound up towards the listening position.
Because the drive units are located off-centre, if the boxes are more than a couple of metres apart, B&W suggests placing them with the drive units lined up closest to each other (that is, on the inside edge facing you). If you are using them close together, have the boxes with the drive units on the outside edges facing you.

The foam front lining on my pair has perished, by the way; little granules of the original material still keep drifting out whenever the speakers are moved. This doesn't seem to have any bearing on the sound, though.

I first heard them about 30 years ago and couldn't get over their ability to convey power and delicacy. Upstream of them was a Thorens 160/Quad 33/Quad 303 system. About 10 years ago I was lucky enough to get the entire system from the original owner.

The DM2as are big, heavy and frankly don't fit in with the average household. However, people who have heard music at my home are remarkably consistent about one thing: they really like what they've been listening to. Of course, the DM2as can't claim all the credit, but clearly they are something special. They're not for everyone - I've already mentioned the bass and I wouldn't call DM2as the last word in dynamics either - but as I mentioned they have other virtues.

Current system includes Linn Sondek/Quad 34/Quad 405-2. The DM2as have also sounded great with Quad IIs. Although I would prefer to use my Alan Hobkirk pre-amp, it doesn't have a moving coil input. The Quad 34 does have a MC input, but the soundstage seems constricted by comparison.

BE
Big Ears
contributor
 
Posts: 14
Joined: 19 Apr 2008 06:12
Location: Cape Town, South Africa

Postby poppers » 20 Jan 2009 12:24

Thanks for that info. I'm using them with a Quad 33/303 combination and wondered if it was powerful enough to drive them.

I too have the original stands but they are not currently attached. There is a dial on the back of each speaker but i'm not sure what this is for.

I still haven't got over they size of them but i do notice that i hear more in each Record/CD that i play than my old speakers could muster. I think i'll have to expreriment with their placing for a while and see what's best.

They are in great condition and the original grills are also unmaked.
poppers
senior member
 
Posts: 111
Joined: 12 Aug 2008 13:34
Location: UK

B&W DM2a

Postby Big Ears » 20 Jan 2009 20:17

The manual says between 25 and 60 watts RMS is suitable, though I have driven them comfortably with (15 Wpc) Quad IIs. The specification reads "13 W into a nominal 8 ohms... to produce an spl of 95 dB at one metre at 400 Hz".

The knob on the rear between the speaker binding posts is for tweaking the treble response. Centre position is for a flat response. Turning it in one direction cuts the upper-mid response by 2 dB; turning it the opposite way lifts upper-mid response by 2 dB.
Big Ears
contributor
 
Posts: 14
Joined: 19 Apr 2008 06:12
Location: Cape Town, South Africa

Postby poppers » 21 Jan 2009 12:50

Thanks for that. Do they have a spacing distance they prefer or a little toe in?
poppers
senior member
 
Posts: 111
Joined: 12 Aug 2008 13:34
Location: UK

Return to Loudspeakers


Design and Content © Vinyl Engine 2002-2013

faq | site policy | advertising | hifiengine