AMS 8051 specifications Key Input, Key Filter, Bias Control, Output Level, Power

8051 5.1 Compressor User Guide

Key Input

A Key Input is provided to allow adjustable control from an external source. Like the sidechains the key input has a threshold level control ranging from -20 to +16 to set the intended level at which compression control is required.

It can be used in several ways:

￿Injecting tone to provide a remotely variable base-level of compression on one or both sidechains.

￿'Ducking' from an audio source such as dialogue.

		4	0
KEY I/P		8	4
SIDE	A
CHAIN	12		8
SEL	B
	16		12
IN/OUT		-20	+16
	100Hz	THRESHOLD dBu

A		8051
0	A / B	DISCRETE
	BIAS	MULTI-CHANNEL
B
		COMPRESSOR
		OUTPUT LEVEL dB
POWER

-5.50

￿When connected in parallel with one of the inputs, it allows that input to be routed onto both sidechains with different compression thresholds.

Key Filter

The key input is provided with a selectable 12dB/octave high-pass LFE filter, fixed at 100Hz.

Bias Control

The bias control is used to balance the control voltages from the two sidechains by applying up to 6dB of cut and boost, effectively modifying their ratios.

If only a single sidechain is in use, for example when used as a stereo compressor, the bias control allows ratio values between the standard settings to be selected with continuously variable control.

Output Level

This control provides a variable active pad across all six outputs, from 0dB to -5.5dB in 0.25dB steps. The pad is outside of the relay bypass loop and so always controls all six channels together in order to maximise the unit's output level without clipping.

Power

The power switch is illuminated dim red when the mains is present to indicate that the unit is in standby mode. While in standby all switches are disabled, switch settings are retained and the unit consumes minimal power.

Pressing the power switch brings the unit out of standby (power switch illuminates green). Pressing and holding returns it to standby mode.

￿The unit can be brought out of standby remotely by connecting pins 1 and 12 on the rear panel D-Type connector.

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