Connections; Placement; Room Acoustics - Mackie SRM450 V2 User Manual

CONNECTIONS

The SRM450 v has a female XLR input that accepts a
balanced or unbalanced mic- or line-level signal. When con-
necting a balanced signal, be sure it's wired per AES (Audio
Engineering Society) standards:
XLR
Hot (+) Pin 
Cold (–) Pin 
Shield (Ground) Pin 1
There is also a male XLR connector labeled THRU. This
allows you to connect more than one SRM450 v to the out-
put of your mixing console. Simply plug the signal source
output into the first INPUT jack, and patch that speaker's
THRU jack to the next INPUT jack, and so on, daisy-chain-
ing multiple speakers (see diagram on page 6).
There is a limit to how many you can
daisy-chain together. A general rule is
to maintain a load impedance ten times
or more than the source impedance to
prevent excessive loading on the source.
For example, if your mixer has an output impedance of
10 ohms, then you can daisy chain up to sixteen SRM450s.
This is a load of 150 ohms (SRM450 input impedance=0
kohms; 16 of these in parallel=150 ohms).
Since microphones typically have a higher output im-
pedance, you should limit daisy-chaining from a mic source
to two SRM450s (see the diagram on page 7).
The THRU jack is wired straight from the INPUT con-
nector — there is no electronic circuitry between — so the
signal coming out of the THRU jack is exactly the same as
the signal going in.
Balanced XLR Connectors
10

PLACEMENT

The SRM450 v active speakers are designed to sit on
the floor, a tabletop, or to fit on a standard tripod speaker
stand. They can also be suspended by the rigging points,
shown opposite.
You can lay the cabinet down on its side and use the
SRM450 v as a floor monitor. The asymmetrical trapezoidal
shape of the cabinet provides a perfect angle for aiming up
toward performers from the front of the stage. When used
for monitor applications, we recommend engaging the
LOW CUT filter.
As with any powered components,
protect them from moisture. If you are
setting them up outdoors, make sure
they are under cover if you expect rain.
The SRM450 v generates magnetic
fields. Do not place it closer than two
feet (0.6 meters) from any TV set or
computer monitor. Check the screen
for any change in color or distortion. Do
not place any magnetic audio or video tapes or computer
discs near the SRM450s.

Room Acoustics

The SRM450 v active speakers are designed to sound as
neutral as possible; that is, to reproduce the input signal as
accurately as possible, monitoring the sound rather than
changing it.
Room acoustics play a crucial role in the overall
performance of a sound system. However, the wide high-
frequency dispersion of the SRM450 v helps to minimize
the problems that typically arise.
Top
90 Dispersion
0
up to 20 kHz
90
0