Thiel ss2 Guia De Referência

Página de 12
The most noteworthy features and benefits of the THIEL
SmartSubs can be listed in four categories. These topics are
the subject of this paper.
• The ability to achieve a near-perfect, seamless
transition with any main speakers when used to reproduce
the bass range of channels other than LFE, in video or music
systems. (Patents pending)
• The quality of bass reproduction; low distortion and
very high output.
• The ability to accurately correct the problems of
reinforcement and cancellations caused by nearby walls and
corners. (Patent pending)
• The ability to correct lowered sensitivity and response
changes that are otherwise caused by heating of the drivers’
voice coils so that the response remains correct and
uncompressed during high demand. (Patent pending)
The first of the above mentioned benefits is
implemented with the separate companion crossover unit, the
SmartSub Integrator, that can be used to process 2 channels
of information and deliver a signal to multiple subwoofer
units. The other three of these benefits of the SmartSub
system are implemented in the subwoofer unit.
The ability to play deep bass loudly is a function
of how much air the drivers can move without
excessive distortion, which in turn is dependent on
both the size of the diaphragms and their linear
excursion. It is important to realize that simply
possessing a large mechanical excursion is not
beneficial if the magnetic excursion is not also large. If
the cone can move 1" but the coil comes out of the
magnetic gap, the distortion will be very high.
The SmartSubs include two very high
excursion drivers with a linear excursion
capability so large (1-
" pk-pk) that each driver
can move considerably more air than most
drivers their size.
The specially designed suspension allows
a linear mechanical excursion of more than 2"
pk-pk so that it does not contribute to non-
linearity and distortion.
The SS2, SS3 and SS4 are internally
powered with a 1000 watt rms switching mode
amplifier to realize the full output ability of the
drivers. This type of amplifier provides the
benefit of high efficiency, about 92% in this case,
which allows smaller heat sinks and power
supplies. The sonic quality of this type of amplifier
has improved greatly in recent years, to the point
where they can provide high sound quality even in
full range applications. They are very good for
The 1000 watt switching amplifier used in the SS2, SS3 and SS4. This amp includes
electronic compensation for room boundary and thermal driver effects.
The Integrator is used if the subwoofer is required to
reproduce the bass energy in channels other than the LFE
channel, for example, in the left/right channels. Such a
configuration is desirable if the main speakers either cannot
reproduce the full range of bass or if they cannot play at
sufficient sound levels without bass distortion.
The Integrator does not have traditional controls for
directly controlling crossover characteristics such as slope or
phase for either the subwoofer or the main speaker high pass
filters. Instead, a different approach is taken. There are
settings for telling the Integrator the characteristics of the
main speakers being matched, if a main speaker high-pass is
desired (crossover mode) or not (augment mode), and what
crossover frequency is desired. With this information the
Integrator calculates what filter characteristics will provide
seamless integration of the sub with the main speakers.
The Integrator has speaker level inputs for use in
augment mode and both balanced and unbalanced line level
inputs and outputs for use in crossover mode. Signal is
supplied to the subwoofer via balanced line level
All signal processing is done with analog circuitry.
Digital circuitry is used for user interface, calculation and
circuit control functions.
powered subwoofer applications because they can develop a
large amount of power with very little heat and because any
residual "digital" distortions occur at high frequencies which
are unused in subwoofer applications.