Bedienungsanleitung NAD T 747 (Seite 25 von 42) (Englisch)

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SPEAKER CONFIGURATION

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 “S” (Small),

“Large” and “O”, but note that physical size may be irrelevant.

• A “S” (Small) speaker is any model, regardless of physical size, that lacks

signicant deep-bass response, that is, below about 150 Hz.

• A “Large” speaker is any full-range model, that is, one with deep-bass

response

• An “O” speaker is one that is not present in your system. For example,

you might not have any surround-back speakers installed; in that case,

you would set the “Back” setup item to “O”.

The Speaker Conguration is “global”; that is, it remains in force with all

inputs and in all listening modes. However, speaker settings are part of

the T 747’s Preset system. Consequently, multiple speaker settings can be

stored for easy recall as dierent types of recordings or listening modes

require.

Speaker Conguration can be managed and adjusted by pressing a

combination of [ ] and then [ ] keys. Set “Front”, “Center”, “Surround”

and “Back” to “Large”, “S” (“S 60Hz” up to “S 150Hz”) or “O” as your

subsystem’s speakers require.

Set “Subwoofer” to “On” or “O”, selecting “On” only if you have a subwoofer

connected to the SUBW output jack. If the “Subwoofer” is set to “O”, “Front”

speaker will automatically be set to “Large”.

NOTE

Normally, with speakers set to “Large”, the subwoofer is not active. You

can set Subwoofer to “On” even with “Large” front speakers, in which

case bass content from any channels set to “Small” will be routed to

both the subwoofer and to the front speakers; LFE-channel signal will

pass only to the subwoofer. In most subwoofer-equipped systems,

setting the front speakers to “Small” is usually the better option.

SPEAKER LEVELS

Adjusting the relative balance of your system’s loudspeakers ensures that

surround-sound recordings, whether music or lm, will present the balance

of eects, 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 T 747 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.

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 reective 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 T 747  SETUP MENU

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