HHB comm CIRCLE SERIES Manuel D’Utilisation

Figure 6 5.1 mode - method 1 (switch in 5.1 position)

In the second connection, method 2, all the monitor signal

outputs (normally left, centre, right, left surround and right

surround) are connected to the inputs on the HHB Circle 1,

and the outputs are fed to the loudspeakers. This method

filters the low frequencies (below 120Hz) from the

loudspeaker feeds. The sub-woofer is always driven from the

SUB input - it receives no low frequency information from

the other five inputs. This connection method is widely used,

since by removing the extreme low frequencies, the five

full-range loudspeakers can be utilized more efficiently. This

method of signal connection makes the most of the

Circle 1’s high quality filters.

Figure 7 5.1 mode - method 2 (switch in 5.1 position)

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.

Figure 8 B mode (switch in B position)

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.