Wisdom S90, Руководство пользователя

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3
Introduction
Congratulations on purchasing your Wisdom Audio in-wall subwoofer. The S90’s
Regenerative Transmission Line
TM
technology delivers tremendous bass
performance in terms of depth, dynamics, and distortion resulting in articulate bass
that integrates seamlessly with high-resolution main speakers such as Wisdom
Audio’s Insight or Sage Series.
This manual focuses on the S90 subwoofer itself. In order to fully understand the
system, we recommend you also review the manual for the SC-2/3 System
Controller, or SW-1 subwoofer amplifier, or MiniDSP-1 subwoofer processor,
without one of which this subwoofer will not perform correctly.
While we expect your local Wisdom Audio dealer to take care of the setup and
calibration of the system, we still recommend that you at least briefly review this
and the other manuals to understand the system’s full capabilities.
Overview
Your Wisdom Audio S90 subwoofer uses a modern implementation of an old idea
for high quality, low distortion bass reproduction. While the roots of the
Regenerative Transmission Line
TM
go back to the 1950’s, it is the combination of
modern computer modeling and the vastly more powerful motors of contemporary
driver design that make the RTL
TM
so special.
There is a class of bass enclosures that has been around since the 1950’s, which
can be described generically as “low frequency tapped waveguides” or “tapped
pipes”. It was an idea that was a bit ahead of its time then, since fully optimizing
its use required both powerful drivers and computer modeling. But, if you are into
such things, check out US Patent 2,765,864 (filed in 1955), and an AES paper
published in 1959,
“Analysis of a Low Frequency Loudspeaker System”.
We have utilized sophisticated modeling software in order to fully optimize our
enclosures and have developed drivers that are specifically optimized for this
application. We call our unique implementation of this relatively old idea a “Re-
generative Transmission Line
TM
” subwoofer, or “RTL” sub for short.
All dynamic drivers develop energy on both sides of the diaphragm, with the rear
energy being 180° out of phase with the front energy. If you allow the driver to
operate in free space (no enclosure), the front and rear energies largely cancel each
other out — especially at low frequencies.