JBL Commercial JBL CSMA 240 사용자 매뉴얼

2.7 Connecting to AC Mains

Connect your ampliﬁer to the AC mains power source (power outlet) with the
supplied AC power cord. First, connect the IEC end of the cord set to the IEC
connector on the ampliﬁer; then, plug the other end of the cord set to the AC mains.
When properly connected to a live power source, the power ring should illuminate
with a green color.

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 below the speciﬁed line
voltage and within the speciﬁed frequency range indicated on the back panel of the
ampliﬁer. If you are unsure of the output voltage of your AC mains, please consult
your electrician.

2.8 Protecting Your Speakers

It’s wise to avoid clipping the ampliﬁer signal. Not only does clipping sound bad, but
it can damage high-frequency drivers. The built-in clip limiter prevents 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.
You can switch to the HI-Z mode which, in addition to switching in the output
transformers for 70V and 100V speakers, activates the high-pass ﬁlter. The ﬁlter
prevents potentially damaging subsonic signals from going to the ampliﬁer by
eliminating signals below 70Hz.

2.9 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. Power up the ampliﬁer. The Power ring should change from green to blue.

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.

If you ever need to make any wiring or installation changes, don’t forget to
disconnect the power cord.