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Bowers & Wilkins - 705 S2


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The 705 S2 adopteds Solid Body Tweeter technology for a tweeter-on-top design offering the same performance benefits found in comparable 800 series models.
Instead of using a hollow zinc housing, the 705 S2 uses an inert shape milled from a solid mass of aluminum weighing more than 1kg to provide a stiffer and less resonant structure.

This design enables B&W to use the mass of the tweeter body as a heatsink. It also means they can use the same decoupling mechanism, grille design and tweeter removal tool as the 800 Series Diamond. The first breakup mode of their new carbon tweeter is 47kHz, which is quite an improvement from 38kHz of the Aluminium Double Dome of the CM series.

The Continuum cone (borrowed from the 800 series) design is based on the concept of optimized and controlled flexibility with a highly controlled break-up mode beyond its usable bandwidth. B&W claims it helps it avoid the abrupt transition from pistonic to break-up mode behavior that drastically impairs the openness and neutrality of a conventional drive unit. Continuum is a triumph for experimental work, with more than 70 iterations and eight years of development prior to launch.

These midrange drive units use a new FEA-optimized aluminum chassis that is stiffer than the zinc chassis of the outgoing CM Series. For the bass drivers, B&W developed a more affordable implementation of the Aerofoil cone used in the 800 Series by using paper rather than costly fiber skins.

Solid Body tweeter

Milled from a solid block of aluminium, the solid body tweeter housing design creates an acoustically optimised housing for the tweeter – one that’s exceptionally inert and resistant to resonances.

Carbon Dome™ tweeter
Carbon Dome™ tweeters are a brand new technology purpose-built for the 700 Series. Delivering a dramatic improvement on the aluminium double-dome tweeter, they raise the breakup threshold to 47kHz, for pinpoint imaging accuracy and detail.

Continuum™ cone
First introduced with the 800 Series Diamond, the Continuum™ cone represents the biggest step-change in midrange performance since Kevlar®. Its woven, coated material provides highly controlled break-up, resulting in a more open, neutral midrange.

Technical features > Decoupled Carbon Dome tweeter, Solid Body, Tweeter on top, Continuum cone bass / midrange Flowport™
Description 2-way vented-box system
Drive units 1x ø25mm (1 in) Decoupled Carbon Dome high-frequency
1x ø165mm (6.5 in) Continuum cone bass / midrange
Frequency range -6dB at 45Hz and 33kHz
Frequency response 50Hz - 28kHz ±3dB
Sensitivity 88dB spl (2.83Vrms, 1m)
Harmonic distortion 2nd and 3rd harmonics (90dB, 1m)
<1% 100Hz - 22kHz
<0.5% 150Hz - 20kHz
Nominal impedance 8Ω (minimum 3.7Ω)
Recommended amplifier power 30W - 120W into 8Ω on unclipped programme
Dimensions Height: 340mm (13.4 in) cabinet only
407mm (16 in) including tweeter
Width: 200mm (7.8 in)
Depth: 285mm (11.2 in) cabinet only
301mm (11.9 in) including grille and terminals
Net weight 9.3kg (20.5 lb)
Finishes Cabinet: Rosenut, Gloss Black, Satin White
Grille: Black - Grey (Satin White only). 


Contact Len Wallis Audio

Address: 64 Burns Bay Road,
Lane Cove NSW 2066,
Telephone: (02) 9427 6755