Mesa/Boogie Mini Rectifier Twenty-Five - Page 25

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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 OF SERIES & PARALLEL:

ThisisreallyjusttwosetsofSerieswiredspeakerscon-
nected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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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=
POSITIVE
Speaker A
8 Ohms
Speaker B
8 Ohms
NEGATIVE
Total Load = 4 Ohms
B
L
A
C
K
S
H
A
D
O
W
B
L
A
C
K
S
H
A
D
O
W
SPEAKER A
SPEAKER B
SPEAKER C
SPEAKER D
NEGATIVE
All 4 Spkrs. are 8 Ohms
POSITIVE
B
L
A
C
K
S
H
A
D
O
W
B
L
A
C
K
S
H
A
D
O
W
B
L
A
C
K
S
H
A
D
O
W
B
L
A
C
K
S
H
A
D
O
W
SPEAKER IMPEDANCE MATCHING & HOOK-UP GUIDE: (Continued)