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5
Room Dimensions: use inches instead of feet and inches
Listener Position: Standing =64.4 inches (164mm); Sitting = 48.5 inches (124mm)
Speaker F Values
Speaker Good Better Best
PRI665CV 3.128 2.606 2.086
PRI685CV 2.619 2.183 1.746
Note: Good coverage = ± 6dB; Better coverage = ± 3dB and Best coverage = ± 1.5 dB. Typically we recom-
mend Better coverage but if cost constraints make this impossible for the customer, then use the Good cover
-
age. Best coverage is where you want very even coverage and typically either low or high SPL.
H
diff
= Ceiling Height – Listener Position
Spacing
max
= H
diff
x Speaker F value
Columns = Roundup ( room length / Spacing
max
)
Rows = Roundup ( room width / Spacing
max
)
Spacing
L
= room length / columns
Spacing
W
= room width / rows
First speaker is placed at (Spacing
L
/2, Spacing
W
/2)
Next column is placed at (Spacing
L
/2+ Spacing
L
) … and so on until all columns are placed
Next Row is placed at (Spacing
W
/2+ Spacing
W
) … and so on until all columns are placed
To determine how many subwoofer you require for a room, the calculations are much easier. You determine the
cubic feet of the room (L x W x H all in feet), divide this number by 15,000 and round up.
To determine the max SPL in the room, you need to know H
diff
in feet and the Max SPL of the speaker. Use the
following Max SPL at 3 feet for each speaker is:
Speaker Type Max SPL
PRi665CV 101 dB
PRi685CV 103 dB
PRi85SubCV 101 dB
/Ê®
-«>V}
7/Ê7®
-«>V
}
7
ÊÉÊÓ
-«>V}
7
-«>V}
Ê
ÉÊÓ
W
2
3
W
4
6
W
6
1
W
8
W
4
X
r
i
D
W
2
3
W
4
6
W
6
1
W
8
W
4
X
r
i
D
Note: These are not the absolute max SPL for the speaker. These are
guidelines to use for designing systems.
142-002698-D OWNERS MANUAL PRICV5 5 10/4/07 3:24:06 PM