Review : B&W 700 Series Home -Theater Loudspeaker
System
One advantage larger companies almost invariably have over smaller ones is
their ability to bring top-end technology down into lower price ranges. B&W has
been doing this for years, first with its woven Kevlar drivers, more recently with its
Nautilus tweeters, and now, in the 700 Series, with refinements to the drive units and
cabinetry that had previously only been available in the company's flagship Nautilus line.The
result (based on the models I've heard) is the best value package ever from this stalwart
British firm. The sound from the 700 Series system we assembled for review is both
musical and dynamically explosive. It has many of the qualitites audiophiles expect
from high-end two-channel systems - balanced frequency response, open midrange, high
low-level resolution, wide dynamic range, tight focus, and dimensional soundstaging - plus
the ability in multi-channel mode to conjure a very impressive surround soundfield, from
the confines of an intimate drawing room to the vast terrain of a sprawling battlefield.
At the heart of each B&W 700 lies a freshly conceived 6.5"
bass/midrange driver that is fine-tuned from model to model. Made of B&W's
familiar yellow woven Kevlar - a material so strong it can literally deflect bullets -
this new transducer uses B&W's "Balanced Driver" motor technology, featuring
a copper sheath and aluminimum cap at the magnet's pole piece, as well as a newly designed
bullet dust-cap, for what are said to be quite long and linear excursions. In the
three-way 703, this driver, slightly reduced to 6", is devoted solely to the midband,
and is further enhanced by B&W's fixed suspension - an extremely lightweight yet
rigid open-basket design.
The most obvious of B&W's newly shared technologies starts with the
"Nautilus-inspired" tweeter, a 1" alloy dome that feeds its rear energy
wave back into an absorbent tapered tube-shaped housing. B&W's years of experience
with the Nautilus line show that this "tube-loading" results in a
high-frequency driver that's able to retain its inherent clarity, detail and
low distortion at even the loudests playback levels. These qualities are
important for music playback, allowing triangles, cymbals, brass, electric guitar, and the
high registers of a violin to be played back at realistic levels convincingly and
without strain, and are absolutely critical for high-energy surround movies.The tweeter,
too, incorporates "Balanced Drive" technology, resulting in extra
stiffness, lower mass, and a smooth response that B&W specs out (albeit 6dB down) to
50kHz.
The enclosures' sloped tops aren't just cosmetic pleasantries, though they
do give the speakers a friendly high-tech sort of look; they are part of the sonic
blueprint. The sloping top and front baffle are in fact a single-piece, multiple-ply
design borrowed directly from the Nautilus series. In combination with tapered side
panels, this cabinet construction yields low vibration and freedom from internal
resonance. All models are vented via B&W's patented "Flowport,"
bi-wireable, and available in five wood veneers (black ash, rosenut, walnut, cherry and
maple).
With Dolby Digital and DTS-encoded DVDs, as well 5.1-channel SACDs the
entire sytem comes together with impressive cohesiveness. In a film soundtrack such
as that of the submarine drama U-571, the B&Ws give you all the little details - the
scraping of metal curtain rings and rod, a pen nib on paper - as well as the huge moments
- waves tossing to and fro, and actually breaking back and forth from front to surround
channels - quite seamlessly, with a fine sense of connectedness from speaker to speaker,
and the ability to seemingly suspend sounds between the speakers.
Like B&W's earlier subwoofers, the ASW 750 is fast and tuneful,
integrating very well with the main system. Unlike earlier models, which were a bit
too buttoned-down, this baby can get rough. I couldn't resist plugging it in with
the Nine Inch Nails disc, which definitely gained weight, power, dynamics, and visceral
excitement with the added bass extension and the one-thousand watts of amplification.
Overall, I'd describe each of these 700 speakers as very naturally balanced
from top-to-bottom within its respective frequency range, which means that, no matter how
you may mix and match within the series, you're going to get consistent tonality and
cohesiveness. All of these models are quite fast, with essentially no slop or
over-hang in the bass ...... a clean, uncolored midrange, and a treble that, in addition
to being very extended, is crystalline and detailed. On the other hand, don't expect
any forgiveness with aggressive recordings or sound-tracks with this rig, which leans
slightly toward the dry-and-lean camp.
B&W has a reputatiion for refining its models with top-down technology
and providing owners with a lot of sound for the money. By incorporating so much of its
high-end technology into the 700 Series, B&W has insured that its reputation will grow
stronger than ever. |