12V Trigger Connections; Series And Parallel Speaker Connections; Series Connections - Sherbourn PA7-150 User Manual

or interference heard in the speakers.
• Many RCA type patch cords can be a very tight fit
and there is usually a preferred method of removing
them. Some have to be removed with a twisting ac-
tion. Be gentle or you may damage the jacks of your
amplifier, the cables themselves, or other compon-
ents.
• Many audiophile signal cables are intended to be
hooked up in one direction. If this is the case, the
cables will be marked with arrows the direction of
signal flow.
• It is usual for the right channel RCA patch cord plugs
to be red and the left channel connections to be white,
grey, or black (depending on the cable brand). RCA
connectors that are gold will be designated with a
colored band to designate the channel.

12V Trigger Connections

The 12 VDC trigger connection shown can be used to turn
the amplifier on when the preamplifier turns on.
This trigger will actually work with any switched DC
Voltage from 5-12 VDC, however, the majority of home
theater components use a standard 12 VDC trigger con-
nection for this function. This is the preferred connection
as it has the greatest degree of reliability.
Never switch anything that plugs directly into the wall
with this trigger connection. This action will damage the
unit and VOID THE WARRANTY.
The speaker output terminals for each amplifier channel
are located across the bottom. The top post of each bind-
ing post pair is the positive output, and connects to the
positive (red) post of your speaker. The bottom post of
each pair is the negative, and connects to the negative
(black) post of your speaker.
Regardless of the configuration used for your Sherbourn
amplifier channels, proper connection of each speaker is
essential. The 5-way binding posts can accept bare wire,
spade terminals, and dual or single banana connectors.
Spade connections or banana plugs ensure a simple, solid
fit in the terminal, whereas bare wire may be awkward
when the terminal is screwed down to compress the wire
into place.
Keep in mind that if you use "dual banana" plugs and
"stack" them, you will be creating a parallel connection
and this amplifier is not rated to play below 4 ohms per
channel.
Series and Parallel Speaker
Connections
Whenever connecting more than one speaker per channel
to an amplifier (regardless of the brand), you must con-
sider the way in which the amplifier will be impacted by
adding the additional speaker(s). Additionally, speakers
with dual voice coils also apply to this consideration. Two
voice coils in a single speaker also cause different reac-
tions from an amplifier depending on the way in which
they connect to the amplifier.
Note: Before turning on your amplifier for the first
time, be sure to check:
1.The Balanced / Unbalanced selectors for each ampli-
fier channel (located on the rear panel). If the selection
does not match the connection, the channel will not work.
Make sure you are selecting the proper type of connection
for the cables you are using.
2. The status and meter LED selectors on the rear pan-
el. If these are in the 'off' position, the status and meter
LEDs will not light.
The following information will help you deal with oth-
er common setup problems you may experience during
normal use of your unit. If problems persist, contact
Sherbourn technical support.
The connection of more than one speaker per channel will
tend to degrade the speaker's frequency response and may
make the amplifier run hot. For the best sonic results, use
one speaker per amplifier channel. If you must connect
more than one speaker per channel, there are two methods
in which to do so: Series or Parallel.

Series Connections

A series connection is established when voice coils are
connected in a string – end to end – so there's only one
way for audio signals to flow "in" and only one way for
audio signals to flow "out". For example, if you were to
series-connect two speakers to the front right channel of
the amplifier:
• The positive output terminal of the right channel con-
nects to the positive input post of the first speaker.
• The negative input post of the first speaker connects
to the positive input post of the second speaker.
• The negative input post of the second speaker con-
nects to the speaker's negative output terminal of the
right channel.
The total impedance of speakers in series is found by
adding their impedances together. For example; two, four-
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