Choosing The Correct Cables; Impedance - Samson auro D15 Owner's Manual

Choosing the Correct Cables

Auro series speaker connections are made via the rear panel ¼" and/or Speakon®
connectors. It is recommeneded that you use standard unshielded speaker wires
(12-14 gauge), available at your local pro audio or music store, with either ¼" phone or
Speakon connectors.
If your amplifier uses binding posts, you can use speaker cables with banana plugs, but
be sure to pay attention to the plus and minus polarity when making the connections.
Make sure that the "+" terminal of the speaker, or banana connector, is connected to
the "+" terminal of the power amplifier, and that the "-" terminal of the speaker, or ba-
nana connector, is connected to the "-" terminal of the power amplifier. For a detailed
wiring diagram, please see page 9 of this manual.
Here's a tip: It's fairly easy to identify a monitor that is out of phase just by listening,
especially on a pop record. Listen for the parts of the music that you would expect to
be in the center of the mix, like kick drum and vocals. If you do not hear them directly
in the center (for instance they sound like they are two signals panned hard right and
left) then you are more than likely listening to an out-of-phase monitor system. It is
important that your PA system is connected in phase, otherwise you will not have the
proper low-end response and stereo image.

Impedance

Before you hook up your speaker cabinet, it is useful to learn a little about impedance.
Impedance is the electronic load that the speaker puts on the power amplifier, and is
measured in Ohms.
Here is the tricky, yet simple rule of impedance: When two speakers, of equal imped-
ance, are wired in "Parallel", the total impedance is cut in half. When two speakers are
wired in "Series, " the total impedance is the sum of the speakers' individual impedance.
The Auro D12 and D15 are each 8 Ohms. So, when two Auro cabinets are connected
in parallel, the total impedance is 4 Ohms. The impedance of your speaker also has
an effect on the amplifier. In general, the lower the impedance, the more power your
amplifier will deliver.
IMPORTANT NOTE: There is minimum safe impedance for running power amplifiers. Be
sure to check the manufacturer's recommended impedance for your amplifier to avoid
any damage, which may void your warranty.
Owner's Manual Auro D12/D15 5