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The immersive science of Audio Equipment, brought to you by {name}

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

Reserve price

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Closing date

Thursday

26 December

today

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Tuesday

Sunday

tomorrow

28 December

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The Netherlands

Italy

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Dimensions

Height

Width

Depth

Brand

Bang & Olufsen

Sony

Pioneer

Marantz

Technics

Philips

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Akai

Denon

Yamaha

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Subwoofer speaker set

Audio amplifier

Audio component

Reel to reel audio

Solid state amplifier

Tuner

Headphone

18 cm reels with tape

Solid state stereo amplifier

Equalizer

Reel to reel deck 18 cm

Country of origin

Netherlands

United States

Material

Plastic

Aluminium

Wood

Rosewood

Condition

Good

Excellent

Very good

Mint

Various conditions

Mint (M)

Very Good Plus (VG+)

Excellent (EX)

Good condition - used with small signs of ageing

Good condition - used with small signs of aging & blemishes

Fair / Poor

As new - unused

Excellent condition: barely used with minimal signs of wear

Mint & Sealed (M&S)

Fair & Poor

Extras

No extra's

Power cord

+ Extra item (see description)

Remote control

Original user manual

Refurbished

Power Adapter

Power supply

No cables

Case

Brochures

Microphone Shock Mount

Flight Case

+extra item (see description)

Anti-pop Filter

Period

2010-2020

2000-2010

1980-1990

2024

1970-1980

1990-2000

Style

Scandinavian design

Danish design

Colour

Black

Brown

Record Label

Music memorabilia type

Statue

Box Set

Tested and working

Tested and working/playable

Not tested

1900-2000

After 2000

1400-1900

Before 1400

Creator

Various Artists/Bands in 1970's

Luigi Caccia Dominioni

Various Artists/Bands in Rock

Japan & Related

Various Original Soundtracks

Livio Castiglioni

Pier Giacomo Castiglioni

Achille Castiglioni

Raymond Loewy

Good - Number of items: 3 - Including: Stereo set - No extra's

Akai - AM-17 Amplifier - HX-27W Cassette Deck - CD-19 CD Player Stereo set

Good - Number of items: 4 - Including: Microphone - Box

AKG,Grundig,Telefunken en Philips. - Set of 4 vintage microphones. Microphone - Multiple models

Excellent - Number of items: 1 - Including: Case, Box

Zenith - 99 -25835 - Field Strength metter Radio - Multiple models

Good - Number of items: 12 - Including: No extra's

Sony - Vintage SONY HF10 Cassette Tapes (12 pcs, 10 min, Japan, c.1992–1996)** CD player

Good - Number of items: 1 - Including: Solid state multi-channel receiver - No extra's

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Audio Equipment

This object is no longer available, but there’s still lots to explore

Bower & Wilkins - DM4 - Matching Pair Speaker set

Popular in Audio Equipment

1153 objects

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