Samson MPL 1640 manual Guided Tour Main Section, Mpl

Guided Tour - Main Section

2

3

5

			MPL 1640
	16 CHANNEL AUDIO MIXER
		STERE0							PFL
-20				-10	-6	-3	0	+3		+6
	LEFT
	RIGHT
-20				-10	-6	-3	0	+3		+6
	PFL				PHANTOM					POWER

STEREO AUXILIARY RETURNS

		0
	−∞	+20	L	R
	RETURN 1 LEVEL			BALANCE
		0
	−∞	+20	L	R
	RETURN 2 LEVEL			BALANCE
		0
	−∞	+20	L	R
	RETURN 3 LEVEL			BALANCE
	0
−∞	+15	0		10

3 - 4

HEADPHONES

LEVEL

L	MAIN	R
	+15

0

-∞

dB

1

4

6

7

8

1:Meter - This seven-segment bar meter shows the continuous output level of the Main L/R stereo output. For optimum signal-to-noise ratio, try to adjust all levels so that program material is usually at or around 0 VU, with occasional but not steady excursions to the red +3 or +6 segments. See the “Setting the Correct Gain Structure” section on page 12 for more information.

2:Meter LEDs - These show the status of various conditions within the MPL 1640. The bottom left LED (labeled “PFL”) lights steadily red whenever one or more channels is soloed. The bottom center LED (labeled “Phantom”) lights steadily red when Phantom power is being supplied to all mic connectors (see #1 on page 8 of this manual for more information). The bottom right LED (labeled “Power”) lights steadily red whenever the MPL 1640 is powered on.

3:Stereo Auxiliary Return Level (green) - These knobs determine the input level of signal arriving via the MPL 1640’s three stereo Auxiliary returns. Each return is at unity gain (no boost or attenuation) when set to the 0 position. The input signal is boosted when the knob is turned to the right of 0 and attenuated when turned to the left of 0. When turned fully clockwise (to the “+20” position),

the return signal is boosted by 20 dB; when turned fully counterclockwise (to the “-∞” position), the return signal is infinitely attenuated—that is, there is no sound. For information on how to properly set these, see the sections on pages 12 and 20 entitled “Setting the Correct Gain Structure” and “Using the Auxiliary Sends and Returns.”

4:Stereo Auxiliary Return Balance (dark gray) - These knobs determine the relative levels of the left and right input signals connected to the MPL 1640’s three stereo Auxiliary returns. When the knob is placed at its center (detented) position, both left and right input signals for that Aux return are at equal strength. When moved left of center, the left input signal remains at the same strength but the right input signal is attenuated; when the knob is moved right of center, the right input signal remains at the same strength but the left input signal is attenu- ated. When placed fully counter-clockwise, only the left input signal is heard (panned hard left); when placed fully clockwise, only the right input signal is heard (panned hard right). These “radical” positions are useful when you are using a stereo Aux return as two mono returns—see the “Using the Auxiliary Sends and Returns” section on page 20 for more information.

When only the left input of an Aux return is connected, its Balance knob func- tions as a constant level Pan control, allowing you to continuously place the incoming signal anywhere in the left-right stereo field.

5:3/4 Level (green) - This knob determines the final output level of the Bus 3/4 signal. We made this knob extra big so you won’t miss it even under low-light performance conditions. Signals from all channels that have their Bus

switch (see page 5) set to the “3/4” position are routed here prior to being sent to the rear panel 3/4 output jacks (as described on on page 8). The center detent-

ed “0” position of the knob indicates unity gain (no level attenuation or boost). Moving the knob counterclockwise from the “0” position (towards “-∞”) causes the signal to be attenuated (at the fully counterclockwise position, it is attenuated infinitely—in other words, there is no sound). Moving the knob clockwise from the “0” position (towards “+15”) causes the signal to be boosted by as much as 15 dB. For more information, see the “Using Bus 3/4” section on page 17 of this manual.

6