Alto A400.4 Dragonfly Manual del usuario - Página 9
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4.2 IMPEDANCE
If you connect more than one loudspeaker to the A400.4, please check that
the actual load impedance does not drop below the A400.4's rated output load
that is 4 Ohm. Your A400.4 will not be damaged by excessively low output load
impedances, but will not be able to provide full output power and its protection
circuit will automatically cut off the output signal until the low load condition
is removed.
4.3 HOW TO CHOOSE THE CORRECT SPEAKER
As a consequence, the acoustic is not so critical. Near-field monitors offer
more advantages when compared to large studio monitor, such as smaller size
and lower cost.
Because of its optimal power rating, HI-FI performance, and a no-fan design,
your A400.4 is ideal in driving reference near-field monitor speakers in smaller
studios.
Your A400.4 is also at home driving high frequency compression drivers or full
range PA cabinets or Stage Monitors when enormous SPL is not required.
4.4 POWER CONSIDERATION
this reason, all major Manufacturers of these kinds of amplifiers do not specify
their amps in terms of RMS but most measurements are made with EIA (or
EIAJ) specifications. An EIAJ signal (you can download the signal string from
the site of Electronic Industry Association) simulates a musical signal and it is
applied to the input of
time. Under EIA specification, your A400.4 will deliver 60 watt
continuously with 240 Volt as AC power and with one channel at a time driven.
But switch mode power supply like the one used in your A400.4 are capable of
enormous dynamics and therefore we also measure your A400.4 as "dynamic
power". This is the amplifier capability to deliver a very high "dynamic power" for
short periods of time securing unprecedent SPL with transient sounds. In this
case the total dynamic power of your A400.4 is 120 watt
Your A400.4 will easily drive 4 Ohm loads in Stereo mode.
However, the impedance of any loudspeaker changes with
frequency, and its rated impedance is not always its minimum
impedance.
Today it has become very popular to monitor and mix music
through near-field monitors "reference" speakers. With near
field monitoring, small speakers are positioned a few feet
from the engineer's ears.
Digital amplifiers and switch mode power supply (which are
parts of your A400.4) are designed to reproduce musical
signals with high dynamics, high SPL and low distortion. For
LTO amplifier continuously, that is for a long period of
channel
channel on 4 ohm.
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