Mesa/Boogie Rectifier Stereo owner manual Speaker A 8 Ohms, Total Load = 4 Ohms, Speaker B 8 Ohms

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. ItÕs 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 O hm 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

			S
	K		H
C		Made by
A				D
		Electro-Voice			O
L					W
B

Total Load = 4 Ohms

Speaker B

8 Ohms

			S
	K		H
C		Made by
A				D
		Electro-Voice			O
L					W
B

NEGATIVE

POSITIVE

COMBINATION OF SERIES & PARALLEL:

All 4 Spkrs.are 8 Ohms

SPEAKER A SPEAKER B

			S
	K		H	D	C
C		Made by
A				O	L
L		Electro-Voice			A
				W	B
B

SPEAKER C SPEAKER D

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.

S
H
A
Made by
D
Electro-Voice	Simply connect the Positive side of Speaker A to the Posi-
O
W	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.

	S
K	H
	A
Made by		D
Electro-Voice
		O
		W

		S
	K	H
C
A	Made by		D
L	Electro-Voice
B

4 Eight (8) Ohm speakers wired in Series Parallel + a Total Load of 8 Ohms.

POSITIVE NEGATIVE

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