Mesa/Boogie pmn User Manual download pdf (Page 22)

PAGE 18

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 ﬁ guring 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 OF SERIES & PARALLEL:

This is really just two sets of Series wired speakers connected 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 ampliﬁ er. This is when you

need to ﬁ gure out the loads and how to wire them up

without applying too low of a resistance on the ampliﬁ er.

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 = a

Total Load of 8 Ohms.

POSITIVE

Speaker

8 Ohms

Speaker

8 Ohms

NEGATIVE

Total Load = 4 Ohms

SPEAKER A

SPEAKER B

SPEAKER C

SPEAKER

NEGATIVE

All 4 Spkrs. are 8 Ohms

POSITIVE

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Mesa/Boogie pmn User Manual Page 22