SPEAKER SETTINGS
Every surround-sound system requires “bass-management” to direct
low-frequency content from any or all channels to the speakers best able
to reproduce it. For this function to operate correctly, it is important that
you correctly identify your speakers’ capabilities. We use the terms “Large”,
“Small”, “Mini” and “Off”, but note that physical size may be irrelevant.
• A “Small” speaker is any model, regardless of physical size, that lacks
significant deep-bass response. Set to SMALL if your speaker cannot
handle lower than 100 Hz.
• A “Large” speaker is any full-range model, that is, one with deep-bass
response. Set to LARGE if your speaker can handle 20 Hz - 20 kHz full
frequency range.
• Select “Mini” if your speaker cannot handle lower than 150Hz.
• Set “Subwoofer” to “On” or “Off”, selecting “On” only if you have a
subwooder connected to VISO FIVE’s SUBW output jack.
• An “Off” speaker is one that may be present such as a subwoofer but set
to “Off” in the “Speaker Settings” setup menu.
The “Speaker Settings” is “global”; that is, it remains in force with all inputs
and in all LISTENING MODES.
ENHANCED BASS
When the subwoofer is set to ON and all speakers are set to “Large”,
Enhanced Bass is also available. Normally, with speakers set to “Large”
the subwoofer is not active. The Enhanced Bass option allows full range
operation of the speakers with the additional bass contribution of the
subwoofer. This feature is particularly useful when one wants to experience
maximum bass output. Please note that due to acoustic cancellation
effects, the bass response may be uneven when using this setting.
You can set Subwoofer to “On” even with “Large” front speakers. In such cases,
both subwoofer and front speaker will receive the LFE-channel signal. In the
case where the front speakers are set to “Small” the LFE-channel signal will be
routed to subwoofer but not to the front speakers; LFE-channel signal will pass
only to the subwoofer. In most subwoofer-equipped systems, setting front
speakers to “SMALL” is usually the better option.
SPEAKER DISTANCE
Setting the Distance lets the speakers know how far the sound has to travel
to reach your set listening point. This allows the sound from each speaker to
reach the listener at the same time.
Distance can be adjusted within 1FT (0.30M) up to 30FT (9M).
Distance setting is not applicable for Subwoofer.
CHANNEL LEVELS
Adjusting the relative balance of your system’s loudspeakers ensures that
surround-sound recordings, whether music or film, will present the balance
of effects, music, and dialog that the artists intended. Additionally, if your
system incorporates a subwoofer it establishes a correct relationship
between the volume of the subwoofer and the other speakers, and thus of
low-frequencies (bass) to other sonic elements.
USING AN SPL METER
It is quite practical to perform the VISO FIVE level setup routines “by ear”, and
careful work will produce acceptably accurate results. However, the use of an
inexpensive sound-pressure level (SPL) meter, such as Radio Shack part number
33-2050, makes this task easier, more accurate and more repeatable. Ownership
of such a meter could prove a valuable audio tool. Your NAD audio specialist
may be able to help you with temporary use of a meter.
The SPL meter should be placed at the primary listening position, at
approximately the height of the seated listener’s head. A tripod is helpful
but with a little duct tape almost anything — a pole lamp, music-stand,
or ladder-backed chair, for example — can do as well. Just be sure that no
large acoustically reflective surfaces obstruct or are near the microphone
element.
Orient the meter with its microphone (usually at one end) pointing straight
up toward the ceiling (not toward the speakers) and ensure that “C”
weighting scale is selected. Set the meter to display 75 dB SPL. On Radio
Shack meters, this necessitates either setting the meter to its 80 dB range
and taking your readings at the -5 point or selecting the 70 dB range and
reading at the +5 point.
OPERATION
USING THE VISO FIVE – AUDIO SETUP MENU
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