Model lCi Operation Manual
72 43
31 24
We use the same method to figure how far the centers
of the speakers should be from the side walls. We take the
width of the room, (14 feet) convert it from feet to inches,
(14 x 12 = 168) and divide the result by odd numbers.
168 divided by 3 is 56 (all to the nearest inch)
168 divided by 5 is 34
168 divided by 7 is 24
168 divided by 9 is 19
168 divided by 11 is 15
The results of these odd number divisions are the distances
in inches that the center of each speaker can be placed into
the width of the room, away from the side wall, to minimize
nodes and anti-nodes.
Now we can graph these odd dimensions distances on
the room drawing and see the intersection points of the
lines. These points represent where the centers of the
speakers can be placed to minimize nodes and anti-nodes.
72
43 31 24
As#you#can#see,#we#have#many#intersections#to#choose#
from#in#our#example#room.#Some#of#the#intersections#in#
your#room#will#probably
#
be#eliminated
#
by#aesthetic#or#room#
function#considerations,#so#you#may#have#less.#
As#you#try#different#placements#for#your#speakers,#al-#
ways#place#both#speakers#on#the#same#length#line.#For#ex-#
ample,#both#speakers
#
would#be#placed#on
#
the#43-inch#line#or#
both#speakers#would#be#placed#on#the#24-inch#line.#The#
speakers#can#be#placed#on#different#width#lines,#for#example#
one#on#the#34-inch#line#and#the#other#on#the#56-inch#line.#
Placing#the#speakers#on#different#rather#than#matching#
width#lines #will#require#that#the#lis tenin g#position#be#offset#
to#center
#
it#betwe en
#
the#speakers .#Often,
#
the#bass#response#
of#the#system#will#be#slightly#more#linear
#
with#the#speakers#
placed#on#different#width#lines,#(asymmetrical#placement)#
while#the #imaging#will#often#be#better#with#the #speakers#
placed#on#matching#width#lines#(symmetrical#placement).#
After#listening#to#the#speakers#centered#on#the#charted #
intersections,#you#should#listen#with#the#speakers#a#couple#
of#inches#away#from#the#inter section#points#in#each#direc-#
tion.#In#some#cases,#the#speakers#will#sound#better#slightly#
off#the#intersections#due#to#the#particular#characteristics#of#
your#room#or#a#slight#error#in#your#original#room#measure-#
ments.#Both#speakers#should#be#moved#the#same#amount#
forward#or#backward#when#fine-tuning#placement.#
Several#factors #influence#how#speakers#interface#with#a#
room#other# than#the#room's#basic#dimensions#so#it#is#pos-#
sible#that#none#of#the#placement#options#on#the#wall#you#ini-#
tially#place#the#speakers#on#will#sound#quite#right.#The#
sound#may#have#too#much#or#too#little#bass#or#be#too#for-#
ward#or#too#withdrawn.#If
#
you#are#unable
#
to#achieve#satisfac-#
tory#sound#with#the#speakers#placed#on#one#wall,#try#placing#
the#speakers#on#another#wall#of#the#room.#Even#in#a#rectan-#
gular#ro om ,#the#speakers#will#interface#differently#with#the#
room#depending#upon#which#of#the#four#walls#they#are#
placed.#In#some#rooms#the#speakers#will#sound#best#on#a#
short#wall#while#in#other#rooms#the#speakers#will#work#bet-#
ter#on#a#long#wall.#
THIRD DIMENSIONS PLACEMENT
A placement method that provides some unique effects
is to place each speaker on the thirds of the room measure-
ments and the listening position on the third of the length.
The speakers are placed one third the length of the room
from the wall behind them and one third the width of the
room from the walls alongside them. The listening position
is then placed one third the length of the room from the
wall behind it.
72
72
In our 14 by 18 foot example room, the thirds are 72 in-
ches in the long dimension and 56 inches in the short dimen-
sion. The intersections of these measurements are used for
third dimensions placement. In addition, the listening posi-
tion is placcd 72 inches from the rear wall of the room.
Both speakers should be tried up to two inches ahead
and behind the intersections to determine if this improves
the sound. Both speakers should be moved the same
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