18 • 550x
NOTE: Inserting a plug into the Effects Receive jack activates the Effects Blend control. The control
receives this command through the ground created by the phone plug making contact with the jack.
The plug must be a mono plug (tip and ground). If you have a stereo plug only, it will be necessary to
tie the ring and the ground together.
SubWave™ ACTIVATOR FOOTSWITCH
Your 550x comes equipped with the capability for hands-free control of the SubWave™ effect. To achieve this function, locate
the footswitch and 25-foot 1/4"-to-1/4" instrument cable included in your 550x packaging. Connect one end of the cable to
the output jack on the footswitch, and connect the other end to the SubWave™ Footswitch jack on the rear of your 550x. Turn
the effect on and off by stepping on the switch; the illuminated switch above the SubWave™ Level control on the front panel
should alternate on (blue) and off, and the effect should engage and disengage accordingly.
A few notes: The type of switch contained inside the footswitch chassis is momentary, normally open. Also, if you connect the
footswitch to the unit while the unit is on, the SubWave effect may engage. This is normal.
SPEAKER OUTPUTS MODE SWITCH
Setting the Speaker Outputs Mode Switch up to the "On" position allows the signal from the amplifier to be heard through any
speaker enclosure(s) connected to the Speaker Output section of the 550x. Setting this switch down to the "Off" position dis-
ables the speaker output section. This feature allows you to:
1. Use the Balanced (XLR) Output without using the internal speakers. This is especially useful in
recording when you are "miking" the speakers and only a direct signal is required for the moment.
2. Tune up without making sound onstage (and interfering with other band members) while using the
Tuner Out feature.
3. Defeat the "pop" you sometimes get when changing and/or unplugging instruments from the unit
(especially if you sometimes forget to disconnect your instrument cable from the amplifier before
disconnecting it from your bass, something that's always a good idea).
4. Defeat the "pop" present upon powering up the unit (though it causes no harm to the unit and/or
your speakers).
550x - SPEAKER OUTPUT SECTION
This section of the manual will deal with the proper connection of speaker cabinets to the power amplifier in the 550x. Some
of this ground has already been covered in the Getting Started–Connecting Your Speaker Cabinets section in the begin-
ning of the manual. This is meant to supplement that section and provide information in greater detail, as power amplifiers,
impedance and speaker cabinets are all crucial in determining how best to operate your new 550x.
HOW IMPEDANCE AFFECTS POWER RATINGS
People often have questions about impedance. What is it? The root of the word "impedance" is the verb "impede," which
means to block or resist. That's what impedance is–resistance to power.
Power amps do not have a pre-determined impedance. They deliver power at whatever impedance the speaker cabinet tells it
to. That's why you hear the term "slave amp"–amplifiers only do what they're told. So if someone tells you that they have a "4
ohm power amp," their terminology and understanding of the concept is way off the mark.
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