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CONNECTING THE SPEAKERS
5, Connecting the High Impedance Terminal
After connecting the speaker's transformer, connect the
speaker unit to the high impedance terminal.
Speaker
70.7CV
O—
Input
Output
former
Trans
COMMON
©-
As the transformer's input impedance is high, many speak-
ers can be connected to the 70.7CV terminal.
70.7CV
©
|
COMMON
|
ihe
ima]
[Frome]
[Trane
mor]
— [stmer}
—[Tormer
er
L} Transformer input impedance: Z
70,7CV
&
1
|
COMMON ©
[
1
'ss
=z
Total Z = ar
|
oR
zrztztat tz
Since the amplifier output is 30 W or 100 W, a speaker
with a wattage exceeding this output value cannot be con-
nected.
But, how
much
impedance
is available for connected
speakers?
Let's calculate a wattage.
The wattage can be calculated by the following formula:
(Watt W) = (Current I) x (Voltage V)
=
{Voltage V)2
{impedance Total Z}
Therefore,
In the case of 30 W,
(70.7)?
=
<
Ww
Z
= 30
n
{n the case of 100 W,
{70.7)?
= ——___——__s
w
Z
= 100
n
In other words, the total impedance connected in
parallel should be as follows:
30 W: Total Z 2 166.7 Q
100 W: TotalZ Z 50Q
The following shows the relationship between the number
of speaker transformers and minimum
impedance,
Minimum
Input Impedance
of Parallel-Connected
Speaker Transformers
67
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