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The total impedance of
speakers
The total impedance when using
several speakers per channel
depends on the individual
impedances and the switching
option. The speaker switching
options are series and parallel. If
the total impedance is too low,
causes an overload of the
amplifier (high current) and
causes the protective circuit to
be permanently activated. If the
total impedance is too high, the
amplifier is prevented from
damage(low current), but on the
other hand, maximum achievable
volume is very low and the
speaker's full potential is not
used.
As the impedance is the
speaker's frequency-dependant
resistor, Revox recommends that
you carry out a test at the
threshold of the permitted
speaker impedance.
Take note of the polarity of the
individual speakers with the
various switching options. The
speakers should always be of the
same type, in order to avoid
variances in sound pressure and
radiation. If one or even more
speakers are connected with
reversed polarity, this results in a
significantly reduced bass
reproduction, together with an
imprecise and diffused sound
picture.
Parallel switching
Z
Z + Z + Z + Z
1
2
=
Z x Z x Z x
1
2
Two speakers in parallel
Three speakers in parallel
Result fig. 1
The parallel switching of 2
speakers is not a problem.
Result fig. 2
The parallel switching of 3
speakers leads to a very low
overall impedance and is
therefore not recommended!
3
n
Z
3
n
fig. 1
fig. 2
4
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