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Recommended Connections
The 205 is a nominal 8-ohm impedance loudspeaker with a
10-watt input capability. The 205-4T utilizes a 4-watt, 25/70.7/
100-volt universal line matching transformer with power taps
ranging from 0.50 to 4 watts.The 205-8T utilizes an 8-watt,
70.7/100-volt universal line matching transformer with power
taps ranging from 1 to 8 watts. The transformer is mounted to
the frame and the primary winding is accessible for the user
to select any of the power taps indicated in the following table
for 205-4T. For use with 100-V lines, connect to the 70.7 V
primary winding, and use the table below to determine the
wattage ratings of various secondary winding taps. Do not
use the tap marked 4 W.
All wattages marked for the various taps refer to the load on
the amplifier, with the insertion loss of the transformer being
less than 1.0 dB.
2
5
V
4
0 .
W
B
o r
w
2
0 .
W
R
e
1
0 .
W
O
a r
n
0 .
5
W
Y
e
o l l
C
o
m
m
o
n
B
a l
k c
8
O
h
m
s
W
h
e t i
C
o
m
m
o
n
B
a l
k c
8
0 .
W
4
0 .
W
2
0 .
W
1
0 .
W
C
o
m
m
o
n
8
O
h
m
s
C
o
m
m
o
n
2
0
5
4 -
T
7
0
V
n
Y
e
o l l
w
d
G
e r
e
n
g
e
B
u l
e
w
V
o i
t e l
B
a l
k c
W
h
e t i
B
a l
k c
2
0
5
8 -
T
7
0
V
B
o r
w
n
R
e
d
O
O
a r
n
g
e
Y
e
o l l
w
B
a l
k c
W
h
e t i
G
r
y e
Recommended Enclosures and Baffles
The 205-8A, 205-4T, and 205-8T are designed to fit on
standard 4-inch ceiling speaker baffles. Additionally, these
loudspeakers will accommodate the use of any standard back
enclosure with a diameter of 5.5 inches or greater and a depth
of at least 4.5 inches. Larger back volumes will increase the
low-frequency output. The frequency response of a 205 in a
typical 1.0-cubic-foot and 1.8-cubic-foot back enclosure are
shown on the last page.
Mounting
The 205 may be front- or rear-mounted against either surface
of its mounting flange and requires a 110 mm (4.35 in.)
diameter cutout and a 120 mm (4.72 in.) bolt circle. Normal
fasteners up to 5 mm (0.20 in.) will fit through the eight holes
in the frame. The 205 is designed for mounting on standard
ceiling speaker baffles.
1
0
0
V
G
e r
e
n
B
u l
e
V
o i
t e l
N
A /
B
a l
k c
W
h
e t i
B
a l
k c
1
0
0
V
R
e
d
a r
n
g
e
Y
e
o l l
w
N
A /
B
a l
k c
W
h
e t i
G
r
y e
Wiring Diagram
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