Bedienungsanleitung Samson ZM75 (Seite 10 von 20) (Englisch)

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Using Passive Speakers

If you are using passive (un-powered) speakers, you

need to first decide where you will place your ZM

series mixer/amplifier. If the speakers in a particular

sound zone are less than 100 feet away, connect the

wires from the amplifier to your passive speakers

directly.

NOTE: This type of wiring is known as "home-run wiring"

since you are making a direct connection from the

amplifiers in the equipment rack to the speakers located

in the sound zone room.

Be sure to check the impedance of the speakers you

are using. The ZM Series amplifiers can run at 4 ohms,

so connect one 4 ohm or two 8 ohm speakers on the

ZM Series 4-Ohm output. If the speakers in a particular

sound zone are further than 100 feet, you should

consider placing the amplifier in the same room as the

sound zone or use a constant voltage speaker system.

Using A Constant Voltage Speaker System

If your installation requires multiple speakers and

long cable runs you should consider running a 70 volt,

constant voltage system. Constant voltage systems

became the installation standard in the mid-1900’s

offering a cost effective solution for installations using

multiple speakers and long cable runs. The idea was

borrowed from the cross-country power grid where

voltage is stepped up and therefore the current is

reduced allowing huge amounts of power to run over

long distances on relatively small, lower cost cable.

Ultimately the voltage is stepped down and delivered

to the customer over a short, heavy gauge cable.

Designing an Installation Plan

Now, take some time to consider where you need to

have sound in your particular installation. After you have

decided where you need to create sound zones, you can

consider your speaker selection, but first decide where

you are going to locate your equipment rack.

Locating Your Equipment Rack

Since the ZM Series amplifiers and ZM series are

standard 19-inch rack mount devices, you should

consider using an equipment rack, such as one of the

Samson SRK series. To select a good location for your

equipment rack, you should consider several points

including the proximity to each of the sound zones,

if the users need to access the gear to change CD’s or

to adjust a volume level and if you have a convenient

location to the electrical service, to name a few. You will

need to consider the length of wire runs and routing

necessary to make the connections from the equipment

rack to the various sound zones. Depending on the

speakers you choose, and the length of cable runs you

need to make, you may choose to run speaker level or

line level to the sound zones. If you are using passive

(non-powered) speakers, you will need to connect the

output channels of the ZM series to an input channel of

the ZM Series amplifier and run speaker wire. However,

you need to be careful to pay attention to the wire

gauge and total length of the wire run. If you are using

powered (active) speakers you can run long distances

using the balanced outputs directly from the ZM series.

Since the ZM series's output connections are terminated

using Euroblock connectors, the wiring can easily be run

in advance of the equipment installation.

Another type of installation is one that uses speakers

and amplifiers (like the ZM Series) with 70-volt

transformers, which are commonly referred to as

Constant Voltage systems. The benefit of a constant

voltage system is you can run long lengths of wire and

have many speakers connected to a single amplifier.

You can also balance the level of each speaker by using

one of the available transformer settings. The ZM series

mixer/amplifiers are ideal for this thanks to their built-in

25/70/100 volt output transformers.

Selecting Speakers for Each Zone

To select the speakers, you need to consider a few

important issues like where you are going to place

your power amplifiers, using powered or un-powered

speakers, or if you need to run a 70-volt distributed

sound system. The following sections provide a brief

overview on how to connect active and passive

speakers or a constant voltage system in a typical

installation.

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