Specifications

USB-80 Mixer Amplifier Owners Manual
5
Speaker Connection
It is possible to connect any number of speakers to this amplifier, from a single unit to 20 or more.
However, it is critical that proper wiring configurations are used, otherwise potentially poor performance,
and likely permanent amplifier damage will result. Generally speaking, speaker systems can be classified
in two groups. Low impedance speakers, such as 8ohm, which are typical of those used in home audio and
other high fidelity applications, and 70V high impedance type, normally found in larger scale commercial
background music and paging systems.
Low Impedance Speakers
Most commonly, these speakers are 8 ohm (Ω), but may also be 4Ω, 16Ω or some other value. When
connecting a single speaker to the amplifier, simply match the impedance of the speaker to the label
shown on the terminal strip. If the exact impedance is not available, connect to the next LOWEST tap. For
instance, if the speaker impedance is 6Ω, connect to the 4Ω tap.
The adjacent illustration shows connection of a single 8Ω speaker to the
amplifier.
If multiple speakers are connected, they may be connected in series, as
shown in the adjacent illustration. In this case, you simply add the
impedance of each speaker. Two 8Ω speakers connected in series
create a 16 load. This arrangement is normally only practical when four
or fewer speakers are used.
The adjacent illustration demonstrates a parallel connection. In this
case all speakers must be the same impedance. You divide the
impedance of one speaker by the total number of speakers connected.
Two 8Ω speakers connected in parallel creates a 4Ω load. This
arrangement is normally only practical when four or fewer speakers are
used.