Wheelock MX-8 Mixer Specifications download pdf (Page 16)

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Here is a handy chart that pulls together horn selection along with distance and power settings in typical commercial

applications:

Step 3 Select the Correct Amount Of Power

Inthissectionwewillseehowtoselecttheappropriatesizepowersupply(selfamplied24voltsystem)or

amplier(centralamplied70voltsystem).

Self amplied

Central Amplier

For central amplier 70 volt systems, the sum of the selected speaker wattage taps will determine the size of the amplier

— in other words, add up the wattage taps. Forty speakers tapped at 1 watt represent a total wattage demand of 40

watts.Then,sizetheampliersothatthesumofthewattagetapsdoesnotexceed85%oftheamplier’sratedpower.

This will ensure headroom and reserve power.

Horn Loudspeaker Selection Guide

Noise

Level

Typical Area

Wheelock Self

Amplied Horn

Effective

Forward

Coverage

Wheelock

Central

Amplied

25/70/100

Volt Horn

Wattage Tap/Effective

Forward Coverage

Quietto

Moderate

50-75dB

Shipping

Warehouse

SA-H5 128 feet ST-H15B 3.8 watts/128 feet

Noisy

75-85dB

Print Shop,

Factory

SA-H5

SA-H15

64 feet

96feet

ST-H15B 7.5 watts/64 feet 15.0

watts/96feet

Very Noisy

86-96dB

Machine

Shop, Factory

SA-H15 32 feet ST-H15B

ST-H30

15.0 watts/32 feet 30.0

watts/48 feet

Selfamplied(24VDC)systemsare4-wiresystems.ApairofwiresfortheaudioandapairfortheDCvoltagenecessary

topowereachspeaker’samplier.

A very important consideration then is the maximum total current draw, in

milliamps of all speakers to be connected on the same power supply. Thus a single Wheelock RPS-2406 power

supply, which provides 600mA, may be sufcient to power multiple speakers. Actually this approach is somewhat

conservative;itisseldomnecessarytooperatethesespeakersatfullvolumeandpower.Athalfvolumeselfamplied

speakers draw considerably less current and still deliver plenty of sound for most environments. Power supplies can

be run in tandem...that is, paralleled with positive poles and negative poles connected together to yield double the

available current. Forexample,apairof600mARPS-2406powersuppliescanbetiedtogethertoyield1200mA(1.2

amps).Formorepower,Wheelockalsoprovidesthe4ampRPS-244024VDCpowersupply,andthe8-output,20.8

amp PSC-2420-B 24VDC power supply. The PSC-2420-B features a battery charging circuit with automatic switchover

tobackupbatteries.Checkthespecicationsofthepowersupplytobeusedinordertostaywithinitsoperatingrange.

Usingself-ampliedspeakersandother24VDCproductswithapowersupplywithbatterybackupwillallowacompletely

battery backed telephone paging system.

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Wheelock MX-8 Mixer Specifications Page 16

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