NAD S170iAV owner manual Trigger Setup, Thx Audio Setup, Configuring The Bass Limiter

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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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