HIWATT Custom 50 SA112 Combo, Owner'S Manual

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Impedance Information:
Before you decide to connect your SSH to your speaker
cabinet, you will want to know about impedance first!
Impedance is the electronic load that the speaker puts on
the power amplifier and is measured in Ohms. (Ω)
Rule of Impedance:
When two speakers are wired, “parallel” the total
impedance is cut in half and when two speakers are wired
in “Series” the total impedance is the sum of the speakers’
individual impedance. i.e. Two 8Ω speakers wired in
parallel become 4Ω. Two 8Ω speakers wired in series are
16Ω.
Make sure that the correct impedance is selected on the
back of the amplifier to match the speaker configuration
you are using. Be sure to check the manufacturer’s
recommended impedance for the cabinets you are using
to avoid any damage to your amplifier and voiding your
warranty.
PLEASE NOTE (Very Important)
You should never turn your amplifier on without having it
connected to a speaker load that matches the impedance
selected on the rear of the amplifier. If you do, you risk
damaging the output transformer and thus voiding your
warranty.
If you use more than one cabinet, the cabinets must all be
of the same impedance. i.e. if you use two cabinets, then
if one cabinet is 16 ohms (Ω), the other cabinet must also
be 16 ohms (Ω). If the cabinets are not of the same
impedance then you will damage the output transformer
and void the warranty.