Specifications
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Important information
Zone 2 - 6 level controls are used to preset levels in different zones relative to each other and to switch
off certain zones temporarily. Zone 5 and 6 outputs are 70 volts speaker line level outputs, these are
fully compatible with 100 volt speakers but will produce a maximum output level about 3 dB lower than
normal 100 volt lines. Use these outputs in the most silent zones. When using an external paging amp,
all speaker outputs from the selected zones are switched to maximum volume (100 volt) during paging, in
other words, the zone volume controls from zone 2-6 are bypassed.
A maximum of 180 watts speaker load is allowed per zone, with a total maximum of 240 watts for all
zones when using the internal MA246 power amplier only. Do not overload the amplier. If the amplier is
overloaded, it will result in overheating the amplier. Check your total speaker load with an impedance or
wattmeter before operating the amplier. Minimum total speaker impedance (all zones combined) is calcu-
lated like this (100 V x 100 V) / 240 W = 41.66 ohms. Please note that impedance can NOT be measured
with a normal multimeter, you need a special impedance meter or 100 volt line wattmeter for this purpose.
In case you need more speakers and/or more power, use an external power amplier for this purpose.
The MA246 has a separate preamplier circuit for zone 1, and a combined pre-out/amp-in connector
for all other zones, allowing you to increase the total output power without the need of a supplementary
preamplier.
Please note that in some cases the music level in non-pageable zones can slightly vary during paging.
When you use an external paging amp, the internal power amp will ‘see’ less speakers at its output,
because these speakers are switched to the external amp’s output during paging. This can result in music
levels varying, depending on the speaker load variation. This is not a malfunction. This effect will increase
depending on the speaker load variation. You can avoid such situations by powering the sensitive zones
with an external amplier connected to zone 1 line level output.