NAD S170iAV - Manual (Page 20)

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CONFIGURING THE S170i
TRIGGER SETUP
The S170i is equipped with 3 12-volt trigger outputs that may be used to turn on, activate, or otherwise
control ancillary components or systems, such as power amplifiers, projector-lifts, lighting systems, and
more. Their function could be as simple as powering up and down your NAD S250 power amplifier, or as
complex as readying an entire home-theater room for use. For more technical information on the S170i’s
12-volt trigger outputs, see Appendix 1, or consult your installing NAD audio specialist.
Simple 12-Volt Trigger Configuration Example: Powering the NAD S250 Power Amplifier
The following example employs the S170i’s 12V Trigger #1 to turn the S250 amplifier on and off in
concert with the preamplifier.
• Using the 12V Trigger cable supplied with the S170i connect the S170i’s rear panel 12V Triggers jack
marked #1 to the 12V Trigger input jack on the power amplifier. Note that this custom cable provides
an 1/8th-inch mini-plug on one end for the S170i, and a special, DC-style plug on the other to fit the
S250 amplifier’s trigger input.
• From the OSD Main menu, select the <Trigger setup> item using the remote’s [Cursor ], and
[Enter] keys. The <Trigger 1> listings should appear as follows (these are the defaults):
polarity Posit.
delay No
duration Infin.
If any other settings are in place, use the remote’s [Cursor ] and [Cursor ] keys to change them
to the above conditions.
THX AUDIO SETUP
THX Surround EX creates a sixth, “center-back” channel intended for reproduction by one or more
loudspeakers located behind the listening area. With recordings bearing the Dolby Surround EX mark, this
delivers a specifically engineered center-back channel that is encoded into the left/right surround
channels-precisely as the center channel was encoded into the left/right front channels in matrix-encoded
Dolby Surround mixes. However, the THX Surround EX processing will often produce a useful center-back
effect even from software that was not, originally, deliberately encoded for EX playback.
BASS LIMITER
The S170i incorporates a Bass Limiter that you can set to eliminate any chance of your subwoofer
producing audible distortion. You will do this by auditioning a built-in test-noise signal the S170i sends to
your subwoofer, and increasing the Bass Limiter’s “headroom” setting to the point of audible distortion.
The Bass Limiter now prevents any program-material signals exceeding this level from being sent to the
subwoofer.
CONFIGURING THE BASS LIMITER
From the <THX Audio setup> menu, use the remote’s [Cursor
] and [Enter] keys to select the <Bass
limiter setup> item. Using the same keys, set <Bass limiter> to “On” and <Limiter noise> to “On”; you
will hear a soft rumbling from your subwoofer. (If you do not hear sound from the sub, check your
subwoofer audio and power connections, check Speaker Setup, below, and/or check the subwoofer’s
own “hardware” control settings)
Now use the remote’s [Cursor ] keys to move to the <Limiter level> item, and [Cursor ] to
decrease the limiter setting by 1 dB increments. As you do, the test-noise from the subwoofer will increase
in level. Listen for the point at which audible distortions (harshening, “clacking,” “chuffing,” or other
extraneous elements) become evident, then use [Cursor
] to return (increase) the limiter level by 1
or 2 dB until the distortion ceases. This establishes the “distortion-free” limit for your current subwoofer
setup. It is advisable to return and re-check your Bass Limiter setup after you have completed the Level
Setup routines (see below).
• Even after the Bass Limiter is set you may usefully engage its test-noise to “search and destroy” the
room-rattles that are inevitably excited by high-level subwoofer output. (Window-treatments,
electrical wall-plates, and hanging artwork are three common sources.)
• Should you ever change subwoofers, or reposition your current subwoofer or listening position, you
should repeat the Bass Limiter setup routine.
• With a high-performance subwoofer, this routine can get rather loud. It is often best to await an
opportune moment when spouses/children/pets are not at home to perform Bass Limiter setup fully.
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