Gain Knobs; Rca Inputs [Channel 2 Only]; Thru Output - Mackie SRM450v3 Owner's Manual

SRM350v3/SRM450v3 Loudspeaker: Rear Panel Features continued...
Balanced 1/4" TRS Connector
Sleeve – Shield (ground)
Tip – Positive (+ or hot)
Ring – Negative (– or cold)
Balanced 1/4" TRS Connector
To connect unbalanced lines to these inputs, use a
1/4" mono (TS) phone plug, wired as follows according
to standards specified by the AES (Audio Engineering
Society):
Unbalanced 1/4" TS Connector
Sleeve – Shield (ground)
Tip – Positive (+ or hot)
Unbalanced 1/4" TS Connector
For more information on these connectors, see
Appendix B on page 17.

4. Gain Knobs

The gain knobs adjust the input sensitivity of the
mic, line and/or RCA inputs. This allows signals from
the outside world to be adjusted to run through each
channel at optimal internal operating levels.
There is – dB of gain with the knob fully down
(off), ramping up to 50 dB of gain fully up (max).
The accompanying LED will illuminate green when
the channel's input signal is present, indicating signal.
It will remain lit so long as there is signal above
–20 dBu present in that channel.
The accompanying LED will illuminate red when the
amplifier in the SRMv3 loudspeaker is near the clipping
point. It is okay if this LED blinks occasionally, because
this means that the transient peaks are just reaching
the maximum output of the amplifiers and you are
getting the most out of your loudspeaker.
If connecting mixer outputs to loudspeaker
inputs, set the gain knob to 10:00 ["Line"]
for optimal sound and performance.
10
SRM350v3 and SRM450v3 Powered Loudspeakers
RING SLEEVE SLEEVE RING TIP
TIP
RING
TIP
SLEEVE
SLEEVE SLEEVE TIP
TIP
TIP
SLEEVE
DJ
2
MON 3
HOLD TO
SOLO
4
SIG/OL
GAIN GAIN
U U
4
LINE MIC LINE
OFF MAX OFF MAX
3

5. RCA Inputs [Channel 2 Only]

The stereo unbalanced RCA inputs allow you to
play a CD player, iPod , or other line-level source.
®
The RCA jacks accept an unbalanced signal using
standard hi-fi [RCA] hookup cables.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Unbalanced RCA Connector
Sleeve – Shield (ground)
Tip – Positive (+ or hot)
Unbalanced RCA Connector
For more information on these connectors, see
Appendix B on page 17.

6. Thru Output

This is a male XLR-type connector that produces
exactly the same signal that is connected to the
main input jack or a mix of channels 1 and 2. Use it to
daisy-chain several SRM loudspeakers together off
the same signal source(s).
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Output Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
Balanced XLR Output Connector
LED
CLEAR
R L
SIG/OL
5
MIC
7
CH 1
MIX
6
POWER
ON
OFF
SLEEVE TIP SLEEVE TIP
SHIELD 1
3
COLD 2
HOT
SHIELD
1
3 COLD
2
HOT