Thiel ss2 Verweisanleitung
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Another example illustrates this “custom” slope ability
of the crossover unit. If the sub is augmenting a sealed 60 Hz
speaker, the crossover again provides the output that will
produce exactly the desired combined output (Fig. 9). Again,
the dotted line shows what a generic filter would provide
and, in this case, the difference is large. The proper curve
provides more output below 25 Hz and less above, with a
slightly more gentle slope.
speaker, the crossover again provides the output that will
produce exactly the desired combined output (Fig. 9). Again,
the dotted line shows what a generic filter would provide
and, in this case, the difference is large. The proper curve
provides more output below 25 Hz and less above, with a
slightly more gentle slope.
The following example illustrates the second technique
of providing a special HP response that will combine with
the speaker’s response so that the total response is correct. If
an 80 Hz crossover is desired with a 60 Hz sealed main
speaker, the HP supplied by the SmartSub crossover is an
unusual shape that resembles an 80 Hz 4th order above 60
Hz and a 2nd order below (Fig. 10).
the speaker’s response so that the total response is correct. If
an 80 Hz crossover is desired with a 60 Hz sealed main
speaker, the HP supplied by the SmartSub crossover is an
unusual shape that resembles an 80 Hz 4th order above 60
Hz and a 2nd order below (Fig. 10).
If the same crossover is desired with a 60 Hz reflex
speaker, you can see in Fig. 1
1 that the supplied HP shelves
below 60 Hz so that, again, the response of the filter
combined with that of the speaker will have the desired 80
Hz, 4th order characteristics.
combined with that of the speaker will have the desired 80
Hz, 4th order characteristics.
A solution
Our desire was to take the guesswork out of subwoofer
crossover adjustments and to be able to easily achieve
accurate results with any main speaker. The approach we
have taken to achieve this goal is different from all others.
Rather than telling the subwoofer how to perform by using
controls for crossover frequency, level and phase, the THIEL
subwoofer crossover unit has settings for the characteristics
of the main speakers you are matching, the configuration of
your system and the performance you desire. This
information is then used to calculate and provide the ideal
subwoofer response and hi-pass filter response that will give
very accurate results with your main speaker.
accurate results with any main speaker. The approach we
have taken to achieve this goal is different from all others.
Rather than telling the subwoofer how to perform by using
controls for crossover frequency, level and phase, the THIEL
subwoofer crossover unit has settings for the characteristics
of the main speakers you are matching, the configuration of
your system and the performance you desire. This
information is then used to calculate and provide the ideal
subwoofer response and hi-pass filter response that will give
very accurate results with your main speaker.
There are two component techniques that are used to
achieve these results.
1) Determining what LP filter characteristic for the
subwoofer will perfectly match the HP characteristic of the
main speaker, either HP filtered in crossover mode, or not
filtered in augment mode.
main speaker, either HP filtered in crossover mode, or not
filtered in augment mode.
2) If a HP filter is supplied for the main speaker signal,
determining what filter will, when combined with the
response of the main speaker, provide a total response that
perfectly matches the desired 4th order, Q=.5 response.
response of the main speaker, provide a total response that
perfectly matches the desired 4th order, Q=.5 response.
Once the crossover unit knows the characteristics of the
main speakers, it calculates and implements crossover rolloff
shape, slope, phase and HP as needed to achieve perfect
results. Not only does the crossover calculate and implement
the optimum setting for the subwoofer cut point, slope and
phase, but these characteristics are not limited to those of
standard filter shapes and instead can be whatever filter
shapes will give the desired results.
shape, slope, phase and HP as needed to achieve perfect
results. Not only does the crossover calculate and implement
the optimum setting for the subwoofer cut point, slope and
phase, but these characteristics are not limited to those of
standard filter shapes and instead can be whatever filter
shapes will give the desired results.
As an example of the first technique of generating
subwoofer response that will blend correctly, Fig. 8
illustrates the subwoofer augmenting a 50 Hz reflex speaker,
extending the bass response to 30 Hz. As is true in every
case, the results in this case are essentially perfect. These
excellent results are achieved because, in addition to the
crossover automatically calculating the optimum phase
response, the response shape of the subwoofer is exactly that
shape needed to perfectly integrate. For comparison, the
dotted graph shows the response that a generic filter would
provide. You can notice the somewhat lower output level
around 30 Hz and a somewhat higher and more gentle rolloff
slope. This “custom” slope is automatically generated and is
exactly what is needed to match this main speaker.
illustrates the subwoofer augmenting a 50 Hz reflex speaker,
extending the bass response to 30 Hz. As is true in every
case, the results in this case are essentially perfect. These
excellent results are achieved because, in addition to the
crossover automatically calculating the optimum phase
response, the response shape of the subwoofer is exactly that
shape needed to perfectly integrate. For comparison, the
dotted graph shows the response that a generic filter would
provide. You can notice the somewhat lower output level
around 30 Hz and a somewhat higher and more gentle rolloff
slope. This “custom” slope is automatically generated and is
exactly what is needed to match this main speaker.
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Fig. 8 50 Hz reflex main speaker response; SmartSub woofer response; net combined
system response. Dotted is generic filter response.
system response. Dotted is generic filter response.
Fig. 9 60 Hz sealed main speaker response; SmartSub woofer response; net combined
system response. Dotted is generic woofer filter response.
system response. Dotted is generic woofer filter response.
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Fig. 11 60 Hz reflex main speaker response; SmartSub crossover response supplied; net
80 Hz 4th order Q .5 response.
80 Hz 4th order Q .5 response.
Fig. 10 60 Hz sealed main speaker response; SmartSub crossover response supplied; net
80 Hz 4th order Q .5 response.
80 Hz 4th order Q .5 response.