14 • 550x
ACTIVATING OR DEFEATING THE LIMITER CIRCUIT
You may either activate or defeat the Limiter circuit via the Effects Blend control, which doubles as an on/off switch for the
Limiter. The "In" position activates the Limiter Circuit, and is the default setting as shipped from the factory. To defeat the
Limiter, simply pull "out" on the knob of this control until you hear and feel a "click." To re-engage the Limiter, push the control
back in to its original position.
LIMITER ACTIVE LED
When the threshold (starting point) of the Limiter circuit is reached, the Limiter Active LED will light, indicating that the Limiter
Circuit is active and helping to protect your power amplifier from clipping. The Limiter LED will not illuminate when: a) the
Limiter has been defeated by pulling out on the Effects Blend control; b) when playing at levels not high enough to engage the
circuit.
NOTE: If you have defeated the Limiter and you hear a loud, sharp distortion present in your
sound–and the Preamp Clip LED is not lighting up–re-engage the Limiter by pushing the Effects
Blend control back in. If the distortion goes away, you were probably clipping the power amp, which is
not a good thing. Remember, the Limiter circuit is there to protect your amplifier from such a state of
operation.
MASTER (VOLUME) CONTROL
The Master (meaning "Master Volume") control adjusts the level being sent to the power amplifier in your 550x–it controls the
overall volume of the unit. Turning the control counter-clockwise reduces the overall level, while turning the control clockwise
boosts the overall level.
Two notes: The Master control never affects the level present at the various audio output jacks on the rear panel–it only
affects the level being sent to the power amplifier, and subsequently, your speaker outputs only. Also, losses caused by exter-
nal effects units can be recovered by increasing the Master control.
POWER ON/OFF SWITCH
Setting the switch upwards to the "On" position turns on the unit, and the switch itself will illuminate in red. Setting the switch
downwards to the "Power" position will turn the unit off, and the red light inside the power switch will turn off as well.
550x - REAR PANEL FEATURES
BALANCED (XLR) OUTPUT
The Balanced XLR out is a true electronically balanced output, suitable for studio and "front-of-house" (live) mixing consoles.
The level present at this output can be adjusted by using the XLR PAD CONTROL (see the "XLR Pad Control" section below
for more details). The signal appearing at the Balanced Output is governed by the setting of the THREE-POSITION XLR
MODE SWITCH located directly below it (LINE/DIRECT/DIRECT + SUB).
In the DIRECT position, the Balanced Output signal comes from directly after the first stage of the specially-selected 12AX7
preamp tube, giving you the sound of your instrument and some added warmth. In other words, it becomes an active TUBE
direct box. In this position, no front panel controls are functional and the SubWave™ is not present.
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