Mesa/Boogie Mini Rectifier Twenty-Five Owner's Manual page 25

SPEAKER IMPEDANCE MATCHING & HOOK-UP GUIDE:
PARALLEL:
When wiring in parallel, the resistance of the speakers decreases. Two 8 ohm speakers wired in (hooked-
up) Parallel results in a 4 ohm load. It's easy to calculate the effect of a resistive load when all the speakers are all the same
resistance. It is really not suggested to wire different resistive load values in Parallel (8 and 4, 16 and 8 etc.) The formula for
figuring the total impedance in Parallel is the multiplication of the two loads divided by the sum of the two loads - i.e. putting
two 8 ohm speakers in Parallel results in a 4 ohm load. Connect the Positive side of Speaker A to the Positive side of Speaker
B - Connect the Negative side of Speaker A to the Negative side of Speaker B.
Speaker A
8 Ohms
All 4 Spkrs. are 8 Ohms
SPEAKER A
SPEAKER C
POSITIVE
Total Load = 4 Ohms
SPEAKER B
SPEAKER D
NEGATIVE
COMBINATION OF SERIES & PARALLEL:
This is really just two sets of Series wired speakers con-
nected in Parallel. This is how you maintain a consistent
load with multiple speakers. The importance of this is
more evident when you have more than one cabinet to
connect to your amplifier. This is when you need to figure
out the loads and how to wire them up without applying
too low of a resistance on the amplifier.
Simply connect the Positive side of Speaker A to the Positive
side of Speaker C.
Connect the Negative side of Speaker A to the Positive side
of Speaker B. Next, connect the Negative side of Speaker
C to the Positive side of Speaker D.
And lastly, connect the Negative side of Speaker B to the
Negative side of Speaker D.
4 Eight ( 8 ) Ohm speakers wired in Series Parallel =
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(Continued)
Speaker B
8 Ohms
NEGATIVE
POSITIVE