Mesa/Boogie F-30 - Manual (Page 24)

SPEAKER IMPEDANCE MATCHING & HOOK-UP GUIDE: (Continued)
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.
COMBINATION SERIES & PARALLEL:
This is really just two sets of Parallel wired speakers connected in series. 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 Posi-
tive side of Speaker C.
Connect the Negative side of Speaker A to the Positive side
of Speaker B, then on to the Positive side of Speaker D and
finally on to the Negative side of Speaker C.
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 = a Total
Load of 8 Ohms.
PAGE 20
POSITIVE
Speaker A
8 Ohms
Speaker B
8 Ohms
NEGATIVE
Total Load = 4 Ohms
Made by
Electro-Voice
B
L
AC
K SHAD
OW
Made by
Electro-Voice
B
L
AC
K SHAD
OW
Made by
Electro-Voice
B
L
AC
K SHAD
OW
Made by
Electro-Voice
B
L
AC
K SHAD
OW
Made by
Electro-Voice
B
L
AC
K SHAD
OW
Made by
Electro-Voice
B
L
AC
K SHAD
OW
SPEAKER A SPEAKER B
SPEAKER C SPEAKER D
NEGATIVE
All 4 Spkrs.are 8 Ohms
POSITIVE