HHB comm CIRCLE STUDIO MONITORS - Manual (Page 13)

full-range loudspeakers can be utilized more
efficiently. This method of signal connection makes
the most of the Circle 1’s high quality filters.
Using the HHB Circle 1 in ‘B mode’, the bass
frequencies are extracted from the left, centre and
right inputs and not from the SUB input. The left
and right monitor signals (or left, centre and right)
are connected to the XLR inputs and the bass
(below 120 Hz) is filtered from these signals,
equally mixed together and fed to the sub-woofer.
The rest of the frequency spectrum from these
inputs is output from the left and right (or left,
centre and right) XLRs as normal for connection to
Circle 3 or Circle 5 speakers. This mode allows
optimum flexibility with both stereo and LCR source
formats.
With the HHB Circle 1 in ‘C mode’, the bass
frequencies are filtered from the left, centre and
right inputs and summed together with the signal
from the SUB input (either XLR or RCA phono).
This method of connection ensures that any
dedicated sub bass mix is always reproduced by
the Circle 1.
The three controls on the HHB Circle 1 allow
simple configuration for each particular surround
setup. An input sensitivity level adjusts the volume
of the sub woofer, without affecting any of the
other signals that may be passing through the
filter stages of the unit. The bass boost control
provides approximately 10dB of boost in a half
octave centred at 33Hz. The function of this is to
compensate for the frequency response of the
human ear when listening at low levels. The boost
control should be normally be set near minimum
when listening at mid to high levels, but the boost
level may be increased as the listening level is
reduced. Please note that the HHB Circle 1 is not
designed to be used at full boost and very high
level. Some user adjustment is required to obtain
the optimum balance between the preferred sound
and power handling / power capacity of the
system. The phase control is provided to enable
smooth integration of the Circle 1 with other
loudspeakers in the surround system; this control
alters the phase of the sub-woofer signal through
180°, enabling the sub-woofer to blend with the
other loudspeakers in the system, whatever your
monitoring requirements. The phase control should
be adjusted to obtain the best, smoothest balance
between the deep, mid and upper bass along with
the mid and high frequencies in the Circle surround
system, with the entire system installed and in the
correct positions.
13
B mode
8
Figure
5.1 mode - method 2
7
Figure
C mode
9
Figure
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