550x • 13
MIDRANGE LEVEL CONTROL
The Midrange Level control cuts or boosts the frequency set by the Midrange Frequency control.
Starting at mid-position, turning the Level control counter-clockwise cuts the desired tone. Turning
the Level control clockwise boosts the desired tone (set by the Midrange Frequency control). When
the level control is set at mid-position ("center-click"), turning the frequency control will have no effect
on the sound.
To find the midrange area you are looking for:
1. Adjust the Midrange Level control to the full boost or cut position.
2. Rotate the Midrange Frequency control until the desired area you wish to cut or boost is found.
3. Adjust the Midrange Level control to the desired amount of cut or boost.
MIDRANGE FREQUENCY CONTROL
The Midrange Frequency control sets the area that is to be cut or boosted by the Midrange Level
control. If the Midrange Level control is set at mid-position, turning the Frequency knob will have NO
effect.
Some hints: If you need to "cut through" the band a little more, try boosting 200 to 400 Hz. If you
like a more transparent or "scooped" sound, try cutting at 800 Hz. The midrange controls are
especially useful in controlling fretless basses and their inherent qualities.
TREBLE CONTROL
The Treble control employs a shelving-type circuit and boosts or cuts the high frequencies (and their subsequent octaves) +/-
15dB from about 2kHz to 14kHz. Starting at mid-position, turning the control counter-clockwise cuts the treble response, while
turning the control clockwise boosts the treble response.
EFFECTS BLEND CONTROL
The Effects Blend Control "blends" the signal sent from your instrument with the signal coming from your EXTERNAL effects
unit. (In other words, it has nothing to do with the SubWave™ effect onboard your 550x.) With the Effects Blend fully counter-
clockwise ("DRY"), no signal from your external effects unit will be heard. As you turn this control clockwise, more of the effect
can be heard in the overall sound. When the Effects Blend control is set fully clockwise ("WET"), no true or unaffected signal is
heard other than what your external effects unit provides. If your external effects unit has a similar control, adjust it to the fully
clockwise ("WET") position. This will avoid any possible phasing problems.
The Effects Blend circuit is similar to that used on recording consoles with the effects loop on a "side chain" to the normal cir-
cuit. Unless the control is set to the full "wet" position, you will always get the full sound of your instrument AND get the diversi-
ty an effects unit offers. This circuit is also effective in reducing noise generated by effects units because it is located after the
gain stages in the preamp.
The Effects Blend control functions only when the Effects Loop is being used. It is activated when a 1/4" phone plug is insert-
ed into the Effects Receive jack (for more information, please see the heading titled "Effects Loop" in the "Rear Panel
Features" section later in this manual).
LIMITER/COMPRESSOR CIRCUIT
The Limiter found in the 550x is a soft knee type limiter. The Limiter circuit is located after (post) the Master Volume and
before (pre) the power amplifier. Therefore, the Limiter is driven by the Master Volume control. Its threshold (starting point) is
preset by the factory so that the user can get maximum overall apparent volume without unduly overdriving (or "clipping") the
power amplifier, which can eventually damage the unit's internal circuitry. This can also be helpful in preventing speaker dam-
age when running your system at high volumes.
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