Mackie SRM450v2 Manuel d'utilisateur télécharger pdf (Page 10)

PLACEMENT

The SRM450v2 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

SRM450v2 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 SRM450v2 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 SRM450v2 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 SRM450v2 helps to minimize

the problems that typically arise.

Balanced XLR Connectors

CONNECTIONS

The SRM450v2 has a female XLR input that accepts a

balanced or unbalanced mic- or line-level signal. When

connecting a balanced signal, be sure it’s wired per AES

(Audio Engineering Society) standards:

XLR

Hot (+) Pin 2

Cold (–) Pin 3

Shield (Ground) Pin 1

There is also a male XLR connector labeled THRU. This

allows you to connect more than one SRM450v2 to the

output 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-chaining 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 120 ohms, then you can daisy chain up to

sixteen SRM450v2s. This is a load of 1250 ohms (SRM450v2

input impedance=20 kohms; 16 of these in parallel=1250

ohms).

Since microphones typically have a higher output

impedance, you should limit daisy-chaining from a mic

source to two SRM450v2s (see the diagram on page 7).

The THRU jack is wired straight from the INPUT

connector — there is no electronic circuitry between — so

the signal coming out of the THRU jack is exactly the same

as the signal going in.

Top

Dispersion

up to 20 kHz

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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Mackie SRM450v2 Manuel d'utilisateur Page 10

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