Parasound Comprehensive Setup and Adjustment Guide for Halo C1 Speaker Systems

ADJUSTMENTS, MENUS, AND SETUP continued 35

Trigger Setup

Many home theater components (including amplifiers, retractable screens, and some lighting equipment) can be controlled by DC trigger signals. The C 1 has three trigger outputs, two of which, P1 and P2, are programmable through this setup screen:

Trigger setup
Trigger 1	sense	PowerOn
-polarity		Posit.
-delay		No
-duration		Infin.
Trigger 2	sense	Vidsign
-polarity		Negat.
-delay		15s
-duration		45s
Exit

Trigger sense defines the event or condition that you wish the C 1 to sense in order to generate a trigger voltage. A few examples are: the moment when the C 1 is turned on; activation of its display dimmer; the presence of a compos- ite video signal, an S-video signal, or whichever comes first; a change of video source (except component video) or any audio source, or selection of any specific source (including the 7.1-channel input and whichever source is assigned to the balanced input).

Polarity does not change the trigger jack’s + output to – and vice versa, as its name implies. Rather, it selects whether the individual trigger output is normally off or normally on. When Polarity is set to “Posit.” the triggering event you selected will switch the trigger output from 0 to +12 volts; when set to “Negat.,” the triggering event switches the trigger output from +12 to 0 volts. Each trigger output can deliver up to 200 milliamperes (200 mA) of current.

Delay adjusts the delay between a triggering event and the actual trigger signal output. It can be set for “No” delay or for any of 14 delays, of 1 second to 3 minutes.

Duration controls the trigger signal’s duration. The trigger signal can be set to remain active as long as the triggering condition applies (“Infin.”) or to any of 16 periods from 10 milliseconds to 3 minutes. If duration is set to 10 ms or 100 ms, additional pulses of 10 ms and 100 ms are generated when the triggering event ends. This enables the C 1 to control devices that require separate turn-on and turn-off pulses.

The third trigger, marked “On-Off” on the rear panel, only operates when the C 1 is turned on and off. It is set for positive polarity, no delay, and “infinite” (continuous) duration.

Thanks to the flexibility of its three triggers, the C 1 can initiate and end a number of operations. For example: the “On-Off” trigger could be used to turn power amplifiers on and off with the C 1; video-based settings could be used to lower a projection screen, turn on a video projector, dim room lights, and draw window curtains.

THX Audio Setup

THX Audio		setup
THX	EX	Enable	Automatic
Boundary		gain	comp.
THX	Ultra2 Sub			Yes
Boundary		gain	comp.	On
ASA
Back	speakers		Together

Exit

THX EX enable can be set to Auto or Manual. With Auto, the C 1 will automatically switch into THX Surround EX mode if the following conditions are met:

1.THX processing is switched on;

2.You are playing a Dolby Digital soundtrack that carries the digital “flag” that identifies it as carrying information for surround back speakers;

3.You selected Back speakers in “Speaker Setup/Size.”

If there is no EX flag, THX processing will default to THX

Cinema for 5.1- and 6.1-channel speaker setups and THX Ultra2 Cinema for 7.1-channel setups. If “THX EX enable” is set to “Manual,” EX processing can be activated, when applicable, by press- ing the THX key on the Master remote once or twice when the C 1 is in Direct mode.

Boundary gain comp. (compensation) tames the excessive, boomy bass that can occur when listeners are near the back wall of home theaters whose subwoofers meet THX Ultra2 stan- dards or have flat anechoic response down to 20 Hz. If you have such a subwoofer, setting THX Ultra2 Sub to “Yes” gives you the option of turning this feature on or off (try listening to it both