Mesa/Boogie MARK 1 Speaker A 8 Ohms, Total Load = 4 Ohms, Speaker B 8 Ohms, Negative Positive

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.

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:

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

All 4 Spkrs.are 8 Ohmsneed to figure out the loads and how to wire them up without applying too low of a resistance on the amplifier.

SPEAKER A SPEAKER B

							S			Simply connect the Positive side of Speaker A to the Posi-
			S					H
	K				C		Made by		A	tive side of Speaker C.
			H D						D
C						Electro-Voice
A		Made by		O	L
		Electro-Voice			A				O
L				W	B				W
B										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
SPEAKER C					SPEAKER D					Negative side of Speaker D.
			S					S		4 Eight ( 8 ) Ohm speakers wired in Series Parallel = a Total
						K		H
			H							Load of 8 Ohms.
		Made by		D	C		Made by
		K		A	A	Electro-Voice
		Electro-Voice
					L
				O
				W	B

POSITIVE NEGATIVE

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