Re: σκέψη αλλαγής ATC 19
Αυτό ισχυει και για τα αυτοενισχυομενα. Με τα ενεργά παιζει και κάτι ακόμα.
Πλεονεκτήματα των ενεργών:
Direct control of each driver by each amp channel
Simple and easier impedance loading on amp
No parasitic power losses
No loss of damping (driver control)
Less likelihood of clipping with clipping limited to single driver
Consistent crossover behavior regardless of power level or signal content
Less loading on each amp with load divided among multiple amps
Less distortion
Στα SCM40A υπάρχει και limiter. Και να θέλεις, δεν θα τα υπεροδηγήσεις.
Μειονεκτήματα των παθητικών:
Generally, the high signal streams require massive components of the frequencyseparating
filters. These massive components inevitably cause distortions and
phase shifts. To put it differently: Exactly because the original signal is being
amplified before it reaches the crossover network, its components (resistors,
spoolings, condensers, etc.) have to be quite voluminous to be capable to
withstand the amperage. So, a strong signal hits strong resistances.
Inescapably, this signal will be impaired and distorted.
The most important specific deprivation caused by passive filters is the so-called
‛damping factor’. This factor indicates the precision with which an amplifier is able
to control the movements of the membranes (of the drivers). A bad damping factor
means that the amplifier is not capable of controlling (the vibrations of) the
membrane(s) in an exact way. Distortions concerning the sound are inevitable. Up
to date high-class amplifier achieve excellent damping factors, but the passive
crossover network impairs this factor drastically. To put it simple: In passive
loudspeakers, the frequency-separating filters are located in
between the amplification and the driver units and necessarily cause
a loss of precision with which the amp can control the drivers.
The best (and therefore quite expensive) crossover networks available today can reduce this
impairment but never avoid it. Even the best ones diminish the damping factor drastically,
on average down to five (yes, 5!) percent of the original value!
