Miles Technology Multisonic M44, Руководство по эксплуатации

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2 The Multisonic Imager
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front soundstaging. Furthermore, this switch can be
left on all of the time (used for all 5.1 sources); in
virtually all cases the sound will be improved.
If a full 5.1 source is not used, the left and right
connections of the 5.1 input can be used as an
additional stereo input. In this case, the 5.1-to-
Multisonic switch should be pressed, and the 5.1
level control will act as a separate level control for
this stereo input.
Discrete Center and Subwoofer Inputs
Discrete balanced input connections are provided
for center and subwoofer signals. These buffered
inputs feed straight through to the corresponding
outputs and are intended for live production work
where discrete source signals can be created at the
mix console and routed directly to the appropriate
loudspeakers. This is very effective for center vocal
or solo feeds, and low-frequency subwoofer effects
which may receive special attention during mixing.
The source for the discrete inputs may typically be a
subgroup output from the mixing console. However,
any line-level signal source can be used. Since it
will be mixed into the output channels at unity gain,
the signal source should have its own level control
(such as the channel or subgroup fader on a
console) for mixing.
The discrete subwoofer input features a selectable
low-pass filter which corresponds to the crossover
filters used for the other outputs. This can be turned
on to prevent subwoofer effects from extending
above the normal subwoofer range, which would
not only sound different but also could cause the
subwoofer to be localizable due to the extended
frequency range of its output. Or if dramatic impact
is more of an issue than seamless imaging, the filter
may be left off and the subwoofer input signal will
be passed through, with full-range response, to the
subwoofer output.
The discrete input signals are mixed with the
corresponding Multisonic output channels which are
derived from the stereo input signals. This creates
seamless soundstaging with combined individual
and stereo signal sources. The result is a great-
sounding stereo mix for everyone in the audience.
Multisonic™ Control
The M44 and M86 both include the C/S Image
Balance control which sets the parameters for the
Multisonic Imaging conversion process. This control
can be set and left in the center position for general
applications, or used for fine-tuning the imaging
performance with different sources.
High-Pass and Low-Pass Filters
The Multisonic Imagers include subwoofer
crossover filters as well as a subwoofer input and
output. Switches are provided to select whether the
main left/center/right outputs are high-passed (for
95 Hz to 20 kHz response) or maintained as full-
band signals (20 Hz to 20 kHz response).
Left/Center/Right Outputs
The Left, Center, and Right outputs are a mix of the
Multisonic Imaging signals derived from the stereo
sources, the discrete center input, and the 5.1 left,
center, and right inputs. This allows optimum front
soundstaging for all types of signal sources, either
individually or in combination.
Spreadsound™ Surround (M86 Only)
The M86 includes a Spreadsound™ circuit in the
derived-surround signal path. The derived surround
signal consists of the left stereo input minus the
right stereo input. In almost all stereo recordings,
this signal consists of reverberation and other
spatial components of the mix. Sounds placed at
the center of the sound stage are cancelled out.
Spreadsound is a method of preventing a focused
phantom-center sound location by spreading the
sound from one loudspeaker to the other
loudspeaker, filling in the entire space between
them rather than creating a phantom center. When
listening to derived surround, a smooth, spread-out,
rear-to-sides effect can be achieved.
Spreadsound uses a special phase-shift circuit to
create two outputs in relative quadrature phase at
all frequencies withing the audio range. This
process is applied to the derived surround signal
from the stereo inputs, and results in two different
outputs which are routed to left and right surround.
Surround Outputs (M86 Only)
The surround outputs on the M86 are a mix of the
derived Spreadsound surround signals from the
stereo inputs, and the left and right discrete
surround signals from the 5.1 input.
The portion of the surround mix from the 5.1 source
is controlled by the 5.1 input level control (which
also affects the entire 5.1 signal level). The portion
of the surround output mix which is the derived
Spreadsound signal from the stereo inputs is
controlled by the Surround level control on the
stereo input side.
The overall level of the surround outputs is
controlled with the Surround Output Level control.