Bowers & Wilkins PV1 manual

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Table of contents for the manual

  • Page 1

    Development of the PV1[...]

  • Page 2

    The Problem The holy grail of subwoofer design is deep and clean bass from a near -invisible box. The immediate problem that arises is that reduced box size both curtails bass extension and increases pressur e on the enclosure wall and driver diaphragm. Many small subwoofers are unable to repr oduce sufficiently extended bass and suffer fr om cons[...]

  • Page 3

    T o illustrate this, there are two analogies that we can apply . The first is the soap bubble. An undisturbed bubble assumes a spherical shape because the pressure difference inside and out is perfectly balanced by the only force the bubble can sustain - surface tension that is entirely in the curved plane of the skin. The second important analogy[...]

  • Page 4

    These effects are r elated to the ratio of the sound wavelength to the dimensions of the enclosure. The resulting pressur e and force gradients allowed the reintroduction of bending for ces on the walls of the sphere, which raised the level of radiated sound and coloration. Going back to our soap bubble analogy it could be likened to the way a bubb[...]

  • Page 5

    A secondary consequence of the use of twin opposing drivers is the inherently balanced kinetic natur e of the device. It is well known that the repr oduction of bass with correct dynamics r equires a firm, solid foundation – sometimes referr ed to as a mechanical ground. It is the reason that speakers stand on spikes. A practical downside is tha[...]

  • Page 6

    The vibration levels of the PV1 (red) are compared with those of a conventional subwoofer (blue) of similar bandwidth, output capability and drive unit radiating area, but using a single 250mm driver in a heavily braced wooden cabinet. Measurements were made by scanning the enclosure surfaces with a laser beam and summing over the total area in eac[...]

  • Page 7

    T echnical featur es Description Drive unit Frequency range Frequency r esponse Amplifier Low-pass filter Dimensions Net weight Cabinet finish Pressur e vessel enclosure 500W I CEp ower® amplifier Switch mode power supply Active closed-box subwoofer system 2x 200mm (8 in) dia mica / aluminium diaphragm long-th r ow -6dB at 18Hz and 40/140Hz ad[...]

  • Page 8

    B&W Group Ltd Dale Road Worthing West Sussex BN11 2BH England T +44 (0) 1903 221800 F +44 (0) 1903 221801 E inf o@bwgroup.com ww w .bwgroup.com B&W Group (Asia) Ltd T +852 2 869 9916 E showr oom@bwgroup.hk B&W Loudspeakers of America T +1 978 664 2870 E marketing@bwgroupusa.com UK Sales Enquiries and Service T +44 1903 221 500 E uksales[...]