Macro-Tech 3600VZ Power Amplifier
Page 19
Reference Manual
3.3.6 Additional Load Protection
Because the amplifier generates enormous power, it
may be desirable to protect loudspeakers (or other sen-
sitive loads) from damage due to excessive power. A
common way to do this is to put a fuse in series with the
load. This may be accomplished by using a single fuse
to protect the entire system, or by fusing each driver.
Fuses help prevent damage due to prolonged overload,
but provide essentially no protection against damage
from large transients. To minimize this latter problem,
use high-speed instrument fuses such as the Littlefuse
361000 series. If the loudspeaker is only susceptible to
damage caused by prolonged overload (such as over-
heating), use a fuse or circuit breaker having the same
slow thermal response as the loudspeaker itself (such
as a slow-blow fuse).
The nomograph in Figure 3.15 shows fuse size versus
loudspeaker peak power rating. It can be used to deter-
mine the size of the required fuse.
3.3.7 AC Power Requirements
Use an isolated power receptacle whenever possible
with adequate current. North American units are
shipped with a 30 amp (10 AWG) line cord, a NEMA
TT30P plug and a mating receptacle. International units
may or may not be shipped with a plug connected to
the appropriate line cord. Line voltages of 10% or more
above the specified voltage may damage the amplifier.
Fig. 3.15 Loudspeaker Fuse Nomograph
