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Electronic
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ELLA is powered by an integrated 2-way active amplifier module. Both sections, the treble- and the
midrange/low frequency range are driven by their own power amplifier which are optimised for each section.
The movement of the membrane is controlled by an adaptive output impedance system (AOI). A phase
compensation in the crossover region matches perfectly the treble and the mid-/low frequency range.
The treble frequency range can be adapted to match the left and the right loudspeaker.
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The loudspeakers are protected against overload. The regulation is dynamic. When the protection circuit
detects an overload, the sound pressure over the whole frequency range will be reduced until the
loudspeakers are protected from damage. The frequency response will be even, also when the signal is too
loud.
As usually the bass section suffers most from overload, the maximum sound pressure level can be raised by
turning down the Roll Off control.
The electronics itself is also protected from overload. Please always replace the fuse with the same type as
marked on the amplifier module.
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The power output of the amplifier can be reduced with the level-button to adapt it to the level of the
preamplifier. Usually the level must not be reduced and remain in the position CAL (calibrated).
When the loudspeakers can not be placed in the same distance to the listening position, the level of the
nearer loudspeaker can be reduced to get the same sound level for both loudspeakers. A mono signal (for
example a news speaker on the radio) must be appear to be exactly between the loudspeakers.
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If a loudspeaker is positioned near a wall, the level of the low frequency will rise unnaturally. With the
Roll-Off button the level can be reduced below 400 Hz to equalize this effect. Usually the level must be
lowered between 4.5 to 6dB to get a smooth response over the whole frequency range. The precise level can
be determined by ear, with a Test-CD or a special measuring equipment. The left and the right loudspeaker
must be adjusted separately. The level determined should be noted in the protocol.
The Roll-Off control can also be used to combine ELLA with a Subwoofer. A subwoofer is useful when high
sound pressure levels in the low frequency range down to 20Hz are requested. Please use only high-quality
Subwoofers with flat low pass filters (-6dB to -12dB/Octave). To get best results, the frequency and phase
response of both systems must be measured and adapted by a professional. Usually put the Roll-Off control
for ELLA between -6dB to -10dB and adapt the output of the subwoofer.
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1=GND
2= (+)
INPUT
ROLL OFF
3= (-)
EMI LP
ON/OFF
CPR* = Compensated Phase Response System
AOI* = Adaptive Output Impedance System
© by KLANGWERK GmbH, Zürich, Switzerland
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LIMITER
LEVEL
115V/230V
+/-45V
FUSE
TRAFO
RECT
CPR / AOI © by PSI AUDIO, Yverdon, Switzerland
HP
LP
HP
LP
+/-17V
TEMP
SENS
POWER
REG
AOI*
POWER AMP
AOI*
POWER AMP
5
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