MartinLogan Monolith III User Manual
Page 17
Page17
Monolith III User's Manual
To prevent subsonic energy from taxing
the listener, room, and driver, a sub-
sonic high-pass filter is necessary. A
third filter is reserved for low-pass filter
operation. The characteristics of
frequency and “Q” of each filter is
affected by component value selection
within each filter section.
The woofer has another set of require-
ments based upon its inherent dis-
placement limitations. In order to
recreate strong low frequency energy
using a dynamic cone drive, a high “Q”
driver in a large tuned (usually ported)
box is required. The trade-off with this
approach is poor speed, acceleration,
and damping of the woofer driver. The
superior performance of the electro-
static element demands that the woofer
be a fast, quick-to-change, well damped
driver so that it will blend with the
electrostatic transducers characteristics
properly. This is best obtained by using
a low “Q”, low mass, small box design.
However, to maintain good low fre-
quency response with this approach,
low frequency boost is required. Here,
again, a shelving filter is used.
Figure 7
Figure 7
Figure 7
Figure 7
Figure 7:
MONOLITH IIIx CROSSOVER block diagram of circuit.