Iinfinity Speakers
The Watkins woofer had two voice coils, with different crossover elements. The
principle was that the second coil had a relatively low impedance at the
resonance of the main coil. This allowed the driver to pull more current from
the amplifier in that region. You weren't getting something for nothing.
Rather this arrangement allowed the speaker to take better advantage of the
power the amplifier could supply.
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