Pyramid PA105 User Manual page 6

NOTE: ADDITIONAL SPEAKERS MAY BE INCLUDED IN
SERIES, BUT IT IS NECESSARY TO CALCULATE TOTAL
IMPEDANCE, AND CONNECT THE SPEAKER CIRCUIT
TO A TERMINAL OF APPROPRIATE IMPEDANCE. FOR
EXAMPLE, IF THREE SPEAKERS OF 4-OHM ARE USED,
TOAL IMPEDANCE IS 12 OHMS, YOU SHOULD
CONNECT TO THE 16-OHM TERMINAL.
System 3:Two (or more) speakers in parallel
1.Connect the LEFT SPEAKER (-) to the RIGHT SPEAKER
(-).
2.Connect BOTH the LEFT SPEAKER (-) and the RIGHT
SPEAKER (-) to the amplifier COMMON terminal.
3.Connect the LEFT SPEAKER (+) to the RIGHT
SPEAKER (+).
4.Connect BOTH the LEFT SPEAKER (+) and RIGHT
SPEAKER (+) to the amplifier 4-Ohm, 8-Ohm or 16-
Ohm terminal, depending on the TOTAL IMPEDANCE
of the two speakers. If each speaker has an
impedance of 8-Ohm, the total speaker impedance
in this parellel configuration is 4 Ohms.
Left
Speaker
+
_
+
_
Right
Speaker
System 4:Four speakers in series/parallel
combination
1.Group the four speakers into two pairs.
2.Connect each pair of speakers in SERIES (see system
2 above).
If you connect 8-ohm speakers, the total impedance
of each pair is 16 ohms.
3.Connect the two pairs of speakers in PARALLEL, If
you connect 8-ohm speakers, the total impedance
of both pairs is 8 ohms.
Note:If each of the four speakers is 8 ohms, the total
speaker impedance of the combined series/parallel
connection described above is also 8 ohms. Likewise,
the total speaker impedance is 4 or 16 ohms, if the
speakers are 4 or 16 ohms respectively.
This example shows a
two 8 Ohm Speakers , the
total impedance is 4
Ohms.
4.Connect the speakers' (-) terminals to the amplifier's
COMMON terminal.
5.Connect the speakers' (+) terminals to the amplifier's
4-Ohm, 8-Ohm, or 16-Ohm terminal, depending on
the TOTAL IMPEDANCE of the FOUR SPEAKERS.
See the chart below for some samples system
suggestions:
COMBINATION OF TWO SERIES PAIRS IN PARALLEL
SERIES PARALLEL
TO EACH PAIR TO TWO PAIRS
(net impedance) (net impedance)
4-OHM + 4-OHM 8-OHM + 8-OHM
(8 OHMS) (4 OHMS)
8-OHM + 8-OHM 16-OHM + 16-OHM
(16 OHMS) (8 OHMS)
16-OHM +16-OHM 32-OHM + 32-OHM
(32 OHMS) (16 OHMS)
+
_
+
_
SERIES/PARALLEL VARIATIONS
Although the description above is for combining TWO
SERIES PAIRS in a PARALLEL hook up, you may also
select to combine a SERIES PAIR and a PARALLEL PAIR
in a PARALLEL hook up. Simply be sure you have
properly calculated the total impedance, and connect
the (+) speaker circuit wire to the proper amp terminal.
For example, if you use a SERIES PAIR of 8-Ohms
speakers (the total impedance is 16 ohms) and a
PARALLEL PAIR of 8-Ohms speakers (the total
impedance is 4 ohms) in a PARALLEL hook up, the
TOTAL IMPEDANCE of this system is 3.2 OHMS, so you
should connect the (+) speaker circuit wire to the 4-
OHM terminal.
5
TOTAL
IMPEDANCE
IN THIS TYPE
4-OHM
8-OHM
16-OHM
+
_
This example shows a
four 8 Ohm Speakers ,
the total impedance is 8
+
Ohms.
_
Use this
amp
terminal
4-OHM
8-OHM
16-OHM