Lexicon DC-1 owner manual Church Parameters

DC-1 Digital Controller

DC-1Effects

The Church Effect uses a reverberation algorithm, which differs from			Church
ambience in that it does not simulate the reflections of specific halls, but
emphasizes rich, smooth reverberant decay in small and medium spaces. It
works well for simulating a space with a long reverberation time relative to
its size, such as a reverberant chamber, or a church.
			Church Parameters
Parameter	Initial Value	Range
MID RT	1.89 sec	.89-13.42 sec
BASS RT	2.36 sec	0.7, 1.0, 1.25xMID RT
HALL SIZE	30 Meters	4-30 Meters
PRE-DELAY	24ms	0-88ms
ROLLOFF	2.6kHz	453Hz-20.0kHz
SPEECH DETECT	ON	ON/OFF
CENTER LEVEL	7	0-15
SUBWOOFER LVL	+0dB	-5 to +5dB
EFFECT LEVEL	-01dB	-30 to +05dB
CUSTOM

MID RT (midrange reverberation time) is the time required for midrange sounds to decay 60dB in level.

BASS RT (low frequency reverberation time) depends on MID RT and is expressed as a multiplier. BASS RT should be set to 1.0 x MID RT for a more natural effect in smaller spaces.

HALL SIZE allows you to select hall sizes of lengths ranging from 4-30 meters (in increments of 2 meters).

PRE-DELAY increases the delay between the direct sound and the onset of reverberation. Because some pre-delay is inherent in the program material, a value of 0 is usually a good starting point. Increasing the pre-delay value will make the hall sound larger.

ROLLOFF mimics the absorption of the air in the hall and, typically, should begin with a low frequency when simulating larger spaces.

SPEECH DETECT activates a circuit that distinguishes monaural speech from other inputs. Essentially, this control turns down the effect to make speech clearer. Whenever stereo signals are present, the right and left input channels are used independently as inputs to the ambience synthesis. If there is a strong monaural speaking voice present at the same time, this component of the input to the Church effect is reduced while the stereo component is increased.

If the input signal is pure monaural speech the reverb is almost entirely attenuated. SPEECH DETECT is a real benefit to some popular music (where spoken voice, such as rap, occurs along with the music), stereo television and early stereo movies. Any stereo material which was not carefully mixed for surround is a good candidate for playing through the Church effect with Speech Detect on.

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