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Ariel Cabello

The DM4 is a three unit monitor loudspeaker comprising a highly developed Bextrene coned midbass unit (DW200/4, designed and produced by B&W), a Celestion HF1300 MkII lower high frequency unit (used also on the BBC LS3/6 and on the Spendor BC1) and a Coles 4001 19mm plastic domed supertweeter (also found on the Spendor BC1/SP1, IMF, Cambridge R50, B&W DM2 and DM2a).

To be more precise, two types of bass units were made, early ones had a white surround (tend to age badly, shrink and cones go off centre) and a later black surround. The crossover network was a third order 18 dB/oct Butterworth filter (3,5kHz-14kHz), and claimed frequency response extended from 30 Hz to above 25 kHz (±2dB). Actually, when measured in axis in an anechoic chamber, the frequency response was just 80Hz-20kHz ±5dB and 140Hz-14kHz ±3dB. Nominal impedance was 8 Ohm, with a minimum at 6 ohm (200 Hz) and a maximum at 25 ohm (∼2000 Hz). The DM4 monitor was individually tested in B&W's anechoic chamber and supplied with automatic pen plot showing frequency response.

Acoustic loading was by a very dense, critically damped enclosure with a small controlling vent to optimise the response between 60 and 120Hz. Not exactly a bass reflex, indeed. The cabinet was constructed of 19mm 750 density chip-board throughout, with inside balancing veneers. Inner surfaces of cabinet were absorbent lined, with the addition of long fibre natural wool, in order to reduce standing waves, reflections and colouration from the enclosure to a minimum. Binding posts accept only bananas, bare wire or forks are not allowed.

Available finishes were: teak, walnut or rosewood, plus a rare and unusual satin white finish or black ash. Claimed sensitivity was 95 dB with 4.8 watts on 8 ohm, at one metre, at 400Hz. This is not the usual modern standard measurement (dB/w/m) so it can be said the DM4 were sub-90 dB/w/m speakers. Hence, the claim - often found on the Web - the DM4 were “high sensitivity” speakers is based on a wrong assumption. They were not 95 dB/w/m!

Power handling might seem ridiculously low by today's standards, but it was considered quite an achievement at the time: indeed, amplifiers from 10 to 30 watts RMS were suggested.

Dimensions: height 531mm (21"), width 254mm (10"), depth 255mm (10"); weight: 11.1kg (24 lbs 6oz)

Beautiful speakers, see pictures for the optical state.

To deliver this product properly, it is packed in very strong boxes, thereby encased in bubble wrap. In addition to the strong packaging, the box is labeled as fragile, using orange "fragile" tape. In case of further packing requirements please message after purchase.

Good - Number of items: 2 - Including: Speaker set - No extra's

Bower & Wilkins - DM4 - Matching Pair Speaker set

Audio Equipment

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Country of origin

Netherlands

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Extras

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Power cord

Remote control

+ Extra item (see description)

Power supply

Original user manual

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No cables

Case

Brochures

+extra item (see description)

Gatefold

Microphone Shock Mount

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unboxed

Period

1980-1990

2010-2020

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1990-2000

Style

Contemporary

Colour

Turquoise

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Unknown label

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Box Set

1900-2000

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1400-1900

Creator

Japan & Related

Luigi Caccia Dominioni

Marco Zanuso

Franco Albini

Mario Bellini

Rodolfo Bonetto

Livio Castiglioni

Pier Giacomo Castiglioni

Achille Castiglioni

Dieter Rams

Richard Sapper

Excellent - Number of items: 1 - Including: DAC - digital analogue converter - No extra's

Bluesound - Node 2 - High End Streamer DAC - digital analogue converter

Excellent - Number of items: 2 - Including: Speaker set - No extra's

Bose - 301 Speaker set

Good - Number of items: 1 - Including: Solid state amplifier - No extra's

Marantz - 1072 Solid state amplifier

Very good - Number of items: 7 - Including: Stereo set - Remote control, Power cord

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Bower & Wilkins - DM4 - Matching Pair Speaker set

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