AMS specifications Threshold, Gain Makeup, Ratio, 8051 5.1 Compressor, User Guide, Issue, Page

8051 5.1 Compressor User Guide

			4	8				4ms	6ms
A		0								8ms		GAIN REDUCTION
					12
		4						2ms		16ms
					16
		8										8	12
												4	16
4	0	-10			+20	3:1	4:1			.4s	.8s	0	20
8		4			2:1			6:1		.2s		1.5s	dB
			MAKE-UP						ATTACK
12		8	GAIN dB		1.5:1			max		.1s		3s
16		12
-20		+16
THRESHOLD dBu						RATIO				RECOVERY
			4	8				4ms	6ms
B		0								8ms
												GAIN REDUCTION
					12
		4						2ms		16ms
					16
		8										8	12
												4	16
4	0	-10			+20	3:1	4:1			.4s	.8s	0	20
8		4			2:1			6:1		.2s		1.5s	dB

	MAKE-UP	ATTACK
12	8 GAIN dB 1.5:1	max	.1s	3s
16	12
-20	+16
THRESHOLD dBu		RATIO		RECOVERY

Threshold

Threshold is the level above which compression begins. Each channel linked to a sidechain (using the SC Link buttons) takes that sidechain's threshold. If a channel is linked to sidechains A and B the lower value of the two controls is used. The threshold controls have a range of -20dBu to +16dBu, adjustable in 2dB steps. Each channel's threshold may be modified by up to ±15dB irrespective of its linking by using the SC Trim controls.

￿A red LED indicator is provided in each sidechain link button. This indicates that a channel is above threshold, and either is the dominant signal or within 2dB of the dominant signal on that sidechain.

Gain Makeup

Gain Makeup is used to restore the average level or loudness of a compressed signal. Linking control voltage to a channel (with the CV Link buttons) assigns either the A or B Gain Makeup control to that channel. If control voltage from both sidechains is linked the larger of the two values is used; this is because the sidechain with the greater gain reduction will be controlling the channel. The gain applied is adjustable from -10 to +20dB in 2dB steps.

Ratio

Ratio controls the amount of gain reduction applied as the input level increases.

At 2:1 for example, a change of 10dB at the input produces a change of 5dB at the output. Values available are 1.5:1, 2:1, 3:1, 4:1, 6:1, and 'max' (approximately 8:1).

The 8051 has a soft-knee characteristic, and its ratio gradually increases as the compression becomes heavier at all settings. The numbers given should therefore be considered average values.

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