E85 Information/Communication
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Increased power requirement
Due to the greater diaphragm displacement Carver woofers
(low-range speakers) require a higher voltage supply than
conventional speakers.
A special DSP amplifier with high voltage output stages (30 V
rms)
is required for the Top-HiFi audio system.
It is necessary to greatly increase the magnetic force in order to
achieve greater diaphragm displacement. The solenoid was
adapted accordingly.
A high magnetic force also means that a high back emf is
produced in the solenoid (back emf U
emf
=B
.
l
.
v).
Fig. 39: Effect of U
emf
on the amplifier
The back emf counteracts the output voltage of the amplifier
thus reducing the effective voltage at the solenoid.
It is not possible to operate Carver speakers with the amplifiers
(radio output stages 6 V
rms) previously used.
KT-10019
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