Instruction Sheet
IS-MA60/125/250
Issued: 5-1-14
Lowell Manufacturing Company
100 Integram Drive Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660
Fax: 636-257-6606 Click: www.lowellmfg.com
10
Result:
One speaker
receives the
total amplifier power.
Result:
Each speaker
receives ½ of the
total amplifier power.
AMPLIFIER
OUTPUT
8W
4W
70V
25V
COM
Result: Total amplifier power is reduced
due to impedance mismatch.
Each speaker receives 1/3 of
the reduced total amplifier power.
AMPLIFIER
OUTPUT
8W
4W
70V
25V
COM
Result:
Each speaker
receives ¼ of the
total amplifier power.
AMPLIFIER
OUTPUT
8W
4W
70V
25V
COM
Result:
Each speaker
receives
1
/
8
of the
total amplifier power.
8 Ohm Series/Parallel Speaker System Wiring
Lowell amplifiers include 8W and 4W outputs that can drive basic 8W speakers without the use of any line matching
transformers. The impedance of the speaker load must always be equal to or greater than the impedance of the
amplifier output. For example, it is safe for the amplifier if the 8W output is used to drive an 8W load or a 16W load,
and it is safe for the 4W output to drive a 4W load or a 6W load, but it is not safe for the 8W output to drive a 6W load
and it is not safe for the 4W output to drive a 2W load. Overloading the amplifier output can cause distortion and can
. It is also important to pay attention to the power rating
of the speakers used. If an 8W speaker is fed from the 8W output of an amplifier and the amplifier is turned all the
way up, the speaker will receive the maximum power output of the amplifier. A speaker must be chosen with
sufficient power handling capacity for the amplifier used. For example, if an 8W speaker can handle 150 watts and
it will be fed from the 8W output of the amplifier, an amplifier with a power output of 150 watts or less should be
chosen so that if the amplifier is turned all the way up,
output. All of the Series/Parallel configurations shown below will result in load impedances that will be safe for the
amplifier when connected as shown. Depending on the size of the amplifier used, verify that the maximum amplifier
power when divided between the speakers, will not exceed the power rating of the speaker chosen.
AMPLIFIER
OUTPUT
8W
4W
70V
25V
COM
One 8W Speaker
Two 8W Speakers
wired in Parallel
Four 8W Speakers
wired in
Series/Parallel
Eight 8W Speakers
wired in
Series/Parallel
Three 8W Speakers wired in Series
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
SPEAKER
+
_
8W
AMPLIFIER
OUTPUT
8W
4W
70V
25V
COM
SPEAKER
+
_
8W
SPEAKER
+
_
8W
(8 pages)
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