Mesa/Boogie TransAtlantic TA-15 Owner's Manual page 26

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 resis-
tance. 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
COMBINATION OF SERIES & PARALLEL:
how you maintain a consistent load with multiple speakers. The importance of this is more evident when you have more than one
All 4 Spkrs. are 8 Ohms
SPEAKER A
SPEAKER C
POSITIVE
Total Load = 4 Ohms
This is really just two sets of Series wired speakers connected in Parallel. This is
SPEAKER B
SPEAKER D
NEGATIVE
(Continued)
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. 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 = a
Total Load of 8 Ohms.
PAGE 22
Speaker B
8 Ohms
NEGATIVE
POSITIVE