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3.3 Connect to AC Mains
Connect the PA Series to the AC mains power source (power outlet) with the supplied AC power
cordset. First, connect the IEC end of the cordset to the IEC connector on the PA Series; then, plug
the other end of the cordset to the AC mains.
WARNING: The third prong of this connector (ground) is an important safety feature.
Do not attempt to disable this ground connection by using an adapter or other
methods.
Amplifiers don’t create energy. The AC mains voltage and current must be sufficient to deliver the
power you expect. You must operate your amplifier from an AC mains power source with not more
than a 10% variation above or a 15% variation below the amplifier’s specified line voltage and within
the specified frequency requirements (indicated on the amplifier’s back panel label). If you are unsure
of the output voltage of your AC mains, please consult your electrician.
3.4 Protecting Your Speaker
It's wise to avoid clipping the amplifier signal. Not only does clipping sound bad, but it can also damage
high frequency drivers. To prevent clipping, insert a limiter between your mixer output and amplifier
input.
That way, no matter how strong a signal your mixer produces, the amplifier will not clip. Set the limiter
threshold so that mixer signals above 0 on the mixer meters do not quite drive the amplifier into
clipping.
Also, avoid sending strong subsonic signals to the amplifier. High-level, low-frequency signals from
breath pops or dropped microphones can blow out drivers. To prevent subsonic signals, insert a high
pass filter between mixer output and amplifier input (or between mixer and limiter). Alternatively,
switch in high pass filters at your mixer. Set the filter to as high a frequency as possible that does not
affect your program. For example, try 35 Hz for music and 75 Hz for speech. On each mixer input
channel, set the filter frequency just below the lowest fundamental frequency of that channel's
instrument.
3.5 Startup Procedure
Use the following procedure when first turning on your amplifier:
1. Turn down the level of your audio source.
2. Turn down the level controls of the amplifier.
3. Turn on the “Power” switch. The Power indicator should glow.
4. Turn up the level of your audio source to an optimum level.
5. Turn up the Level controls on the amplifier until the desired loudness or power level is achieved.
6. Turn down the level of your audio source to its normal range.
If you ever need to make any wiring or installation changes, don’t forget to disconnect the power cord.
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