Controls; Volume; Sub Output Mode; Phase - Tannoy 5.1 Sub 15 Owner's Manual

3.3: CONTROLS

Fig. 3.2.
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1. VOLUME

There are 6 independent gain controls (-6dB to +6dB), one for each channel in the 5.1 system. Bear in mind, when running
elevated or reduced levels on any channel; you may be hearing an overall imbalance in the spectrum that does not exist in the
recording. It is likely that this could result in mixes that tend to have the inverse frequency response. The most important thing
is to maintain a flat, balanced spectrum for monitoring.

2. SUB OUTPUT MODE

For certain music and film production applications, it is mandatory to run the L.F.E. (low frequency effects) subwoofer information
through an outboard proprietary production DSP unit. In this situation, it is a requirement that the subwoofer has a linear frequency
response up to 300Hz. This can be achieved by switching the sub output mode switch to the 'All Pass' position; this will over-
ride the internal 120Hz low pass filter. When no outboard processor is being used the 'Low Pass' position should be engaged
to operate the 120Hz low pass filter.

3. PHASE

Depending on the distance that your subwoofer is placed from your other monitors, it may be necessary to invert the polarity
of your subwoofer. This is achieved simply by switching to the 180-degree position. In most cases, you will find that your system
will work best in the 0-degree position when your sub is located at the front of the room, in line with, or slightly behind your
nearfield monitor location. The phase switch is in the correct position for your set up when the perceived or measured low
frequency output is greatest.
4. HIGH PASS FILTER
With the exception of the subwoofer channel, all channels have a 2nd order high pass filter that operates at 65Hz when the
switch is set to the "On" position. This filter removes low bass frequencies from the signal being passed to your FL/FR/Centre/RR/RL
loudspeakers enabling them to be operated at higher levels without distortion or excursion damage occurring. This mode of
operation will enable you to use the Tannoy Reveal monitors to best effect in a 5.1 set-up.
When in the "Off" position, the loudspeakers will be sent the full frequency range from your console processor, encoder, receiver
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or other device. This mode of operation is suitable if you are using larger loudspeakers.