MACKIE SRS1500 - Manual (Page 4)

4
REAR PANEL DESCRIPTION
POWER Switch
Use this switch to turn the SRS1500 on
and off. Make sure the signal source’s level
control is turned down before you turn it on.
AC Receptacle
This is where you connect the AC line-
cord to provide AC power to the SRS1500’s
built-in power amplifiers. Plug the linecord
into an AC socket properly configured for
your particular model.
PROTECTION Indicator
The SRS1500 has a built-in limiter and
thermal protection circuit that protects the
amplifier and transducer. The
PROTECTION
indicator lights when the limiter is activated.
If the protection indicator blinks frequently
or lights continuously, turn down the signal
source’s level control until the protection in-
dicator only blinks occasionally.
If the internal temperature should exceed
a safe operating level, 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 protec-
tion circuit is an indication that you should
take steps to avoid continued thermal prob-
lems. See “Thermal Considerations” on page 7.
POWER Indicator
When the POWER switch is turned on
and the linecord is connected to an active
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.
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 SRS1500s to-
gether 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 SRS1500 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 set-
ting the balance between the subwoofer
and the main speakers.
PHASE
This switch reverses the polarity of the
signal at the HIGH PASS OUTPUT jacks.
Depending on the placement of the
SRS1500 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 signal. Experi-
ment with this switch to determine which
position sounds best.
POWER PROTECTION
THRU
(FULL RANGE OUTPUT)
HIGH PASS
(MID/HIGH FREQ)
OUTPUT
SUBWOOFER
CONTROL FULL RANGE
INPUT
PARALLEL
120Hz
ON
OFF
NORMAL
REV 180
PHASE
120 VAC 60HZ 350W
POWER
L
R
L
R
SUBWOOFER
LEVEL
(+4dBu ) NORMAL
+15 O O
IN OUT