Appendix; Series And Parallel - Sunfire Cinema Seven User Manual

Series and Parallel speaker con nec tions
The con nec tion of more than one
speaker per channel will tend to
de grade the speaker's frequency
response, and may make the ampliÞ er
run hot. For the best results use one
speaker per chan nel.
If you do want to con nect more than
one speak er per channel, there are
two main ways: Series or Parallel.
Series
For example, if you want to
series-connect two speak ers to the
front right channel of the ampliÞ er:
Amplifier
Outputs
• The positive output terminal of
the right channel con nects to
the positive input post of the
Þ rst speak er.
• The negative input post of the
Þ rst speaker connects to the
positive input post of the sec-
ond speaker.
• The negative input post of the
second speaker connects to
the negative output terminal of
the right channel.
• The total impedance of speak-
ers in series is found by adding
their im ped anc es together. For
example, two four ohm speak-
ers in series is an eight ohm
load.
• Series connections are easier
on the ampliÞ er than parallel
connections as the total imped-
ance is higher than driving a
single speaker.
User's Manual
Parallel
For example, if you want to parallel-
connect two speak ers to the front right
chan nel of the ampliÞ er:
Amplifier
Outputs
• The positive output terminal of
the right channel con nects to
the positive input post of the
Þ rst speaker and to the positive
post of the second speaker.
• The negative output terminal
of the right channel con nects
to the negative input post of
the Þ rst speaker and to the
negative post of the second
speaker.
• The total impedance of equal
speak ers in parallel is found
by dividing the impedance of
one speaker by the number of
speakers. For example, two
eight ohm speakers in parallel
is a four ohm load (eight ohms
divided by two), four eight ohm
speak ers in parallel is a two
ohm load (eight ohms divided
by four).
• Parallel connections are harder
on the ampliÞ er than series
connections, as the total im-
pedance is lower com pared to
driving a single speaker, and
the ampliÞ er must produce
more current to drive them.

APPENDIX

• Ideally, the total average
impedance should be no less
than 2 ohms per channel.
• You must make sure that the
lower impedance does not
cause the am pli Þ er to over-
heat, shut down, blow the line
fuse, or pop your circuit break-
er. If this hap pens, you should
reduce the number of speakers
wired in parallel, rewire them in
series, or use more than one
power ampliÞ er.
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