Mackie SWA1501 REAR PANEL DESCRIPTION, POWER Switch, AC Receptacle, LIMIT Indicator, SIGNAL Present Indicator, THERMAL Indicator, FULL RANGE INPUT, THRU (FULL RANGE OUTPUT)

REAR PANEL DESCRIPTION

POWER Switch

Use this switch to turn the SWA1501 on and off. Make sure the signal source’s level control is turned down before you turn it on.

AC power supply, this indicator lights green to let you know that you’re ready to rock and roll. The cool blue LED on the front of the cabinet works in the same way.

AC Receptacle

This is where you connect the AC line- cord to provide AC power to the SWA1501’s built-in power amplifiers. Plug the linecord into an AC socket properly configured for your particular model.

LIMIT Indicator

The SWA1501 has a built-in limiter that prevents the amplifier outputs from overdriving the transducers. The LIMIT indicator lights when the limiter is activated. It’s okay for the LIMIT indicator to blink oc- casionally, but if it blinks frequently or lights continuously, turn down the level control until the LIMIT indicator only blinks occasionally.

SIGNAL Present Indicator

This LED illuminates whenever there is a signal present at the FULL RANGE INPUT connector on the rear panel.

THERMAL Indicator

The SWA1501 has a thermal protection circuit that monitors the internal temperature of the amplifiers and heatsink. If the internal temperature should exceed a safe operating level, this indicator lights and the signal is muted to allow the amplifier to cool. When the temperature cools to a safe level once again, the thermal protection circuit deactivates and normal operation continues.

Note: Activation of the thermal protection circuit is an indication that you should take steps to avoid continued thermal problems. See “Thermal Considerations” on page 7.

FULL RANGE INPUT

These are female XLR-type connectors that accept a balanced line-level signal from a mixing console or other signal source.

THRU (FULL RANGE OUTPUT)

These are male XLR-type connectors that produce exactly the same signal that is connected to the FULL RANGE INPUT jack. Use it to daisy-chain several SWA1501s together off the same signal source.

HIGH PASS (MID/HIGH FREQ) OUTPUT

These are male XLR-type connectors that produce the frequencies above 120Hz. Connect these to a pair of full-range active speakers or to an amplifer/passive speaker combination. The SWA1501 reproduces the frequencies below 120Hz.

SUBWOOFER LEVEL Control

This adjusts the subwoofer level. The center detent position provides 15 dB of headroom with a nominal +4 dBu input signal. Use this as a starting point for setting the balance between the subwoofer and the main speakers.

PHASE

This switch reverses the polarity of the system. Depending on the placement of the SWA1501 subwoofer relative to the full- range speakers, you may get a better low-frequency response in the room if you reverse the polarity of the subwoofer’s signal. Experiment with this switch to determine which position sounds best.

POWER Indicator

When the POWER switch is turned on and the linecord is connected to an active

	LIMIT	SIGNAL		THERMAL	POWER
	PARALLEL			SUBWOOFER	HIGH PASS
	THRU	FULL RANGE
				CONTROL	(MID/HIGH FREQ)
	(FULL RANGE OUTPUT)	INPUT			OUTPUT
				NORMAL	120Hz
			L		L
POWER	ON			SUBWOOFER
		IN		LEVEL	OUT
SWA1501			R	NORMAL	R
ACTIVE SUBWOOFER
115V-AC FUSE AC125V-T6.3A				REV 180
				PHASE
CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC, WOODINVILLE, WA, USA AND MACKIE EUROPE
• MADE IN ITALY • COPYRIGHT ©2000 • THE FOLLOWING ARE TRADEMARKS OR REGISTERED
TRADEMARKS OF MACKIE DESIGNS INC.: "MACKIE", AND THE "RUNNING MAN" FIGURE • PATENT PENDING

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