SCHOEPS KFM 360 - Manual (Page 15)

15
Settings / Monitor
Additional processing for the rear chan-
nels:
F/REAR BALANCE, REAR DELAY/ms
REAR SLOPE/Hz
To avoid hearing the rear loudspeakers--or
more precisely, to avoid localizing sound
sources in them in a distracting manner--
there are three independent settings which
can be used in any desired combination:
1. Lowering the rear channel level relative
to the front channels (F/REAR BALANCE);
2. Delaying the rear channels relative to
the front channels by up to 55 ms (REAR
DELAY/ms)--in the bottom-center setting,
the delay is 0.
3. Rolling off the high-frequency response
of the rear channels (REAR SLOPE/Hz) at a
12 dB/octave slope--in the bottom center
setting, no high-frequency rolloff is applied
Please note: Although adjustable delay
is a feature normally included only in more
ambitious digital mixing desks, the DSP-4
KFM 360 processor offers such a function.
However, the amount of the delay should
not be changed while the unit is recording
in Surround mode, because such a
change may produce audible side effects.
Additional Low-Frequency Channel
The LFE ("low frequency enhancement")
channel contains the blended, low-pass-fil-
tered information from the two pressure
transducers of the KFM 360 ((L + R)/2). It
does not correspond in function to the LFE
channel of a cinema surround sound system
[i.e. special effects such as earthquakes].
The -3 dB point of the low-pass filter is
80 Hz. It is critically damped with a fourth-
order rolloff (24 dB/octave).
Monitor function REC MONITOR
In recording mode "MODE: A: REC" the
input signals are passed through and are
presented unchanged (apart from the possi-
ble A/D and D/A conversions) at outputs I
and II. Output III in this mode is used for
The Center Channel
The center channel is formed by matrixing
the front-channel signals. It can be turned
off by setting the "FRONT PANORAMA"
selector switch to its lowest position.
However, it will then no longer be possible
to adjust the stereo soundstage width.
Additional processing for the front
channels:
The center channel and the "FRONT
PANORAMA" setting
The center channel is formed by matrixing
the front-channel signals and thus contains
their correlated signal components (those
common to the two channels). The use of
this channel makes it necessary to decorre-
late the front left and right loudspeaker sig-
nals in order to keep the stereo image from
becoming weighted too heavily toward the
center. The degree of decorrelation is con-
trolled by the "FRONT PANORAMA" knob. If
this knob is set to the bottom position, the
center channel signal is not produced, the
matrix is turned off and the decorrelation cir-
cuitry will have no further effect on the L and
R signals.
The "L/R BALANCE" control has the same
function as in a conventional stereo system,
except that its bottom-center setting has the
same effect as the top-center setting: the
balance of the two channels is not altered.