Pull Turbo; Midrange Controls; Midrange Level Control; Midrange Frequency Control - SWR 750x Bass Amplifier 750x Owner's Manual

Pull Turbo

Pulling the Bass Control knob to the "out" position widens the bandwidth of the bass control, and changes
the center-point frequency from 80 Hz to 40 Hz. It has the effect of more clearly enunciating frequencies
down to 30 cycles (low "B" on a five string bass). Often these notes can be felt more than heard, so you
may want to re-check the Preamp Clip LED, and listen for power amp clipping or speaker distor tion as well.
Constant clipping of these frequencies can diminish the life of the speakers or cause them to fail much
sooner than expected.
Note: Setting both the Bass (with or without Pull Turbo engaged) and SubWave™ Level controls
near or at maximum boost will increase the overall amount of bass in your signal VERY SIGNIFI-
CANTLY! We're all in favor of that, just so long as your speaker cabinet can handle the peak levels.
Remember, adjust the controls slowly, and use common sense.

Midrange Controls

Your 750x comes equipped with two different controls for setting the amount of midrange present: one for
boosting and cutting the level of midrange, and another for setting the specific midrange frequency that will
be adjusted in level. Both controls exist on one dual concentric knob. The Level control is located on the
inner portion of the knob, while the Frequency control is located on the outer portion of the knob.

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 con-
trol 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 affect.
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 subse-
quent octaves) +/–15dB from about 2 kHz to 14 kHz. Starting at mid-position, turning the control counter-
clockwise cuts the treble response, while turning the control clockwise boosts the treble response.
Pull Transparency
Pulling the Treble Control knob to the "out" position raises the lowest frequency affected by this control
from 2 kHz to 4 kHz. This may be useful if you're looking to only boost the "high" highs, or "cr ystal" highs,
as opposed to a broader range of treble frequencies that some players feel add too much of the more
aggressive, high-midrange kind of treble to their tone. It can also help a set of dead strings make it through
one more gig.
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 Overdrive and SubWave™ effects
onboard your 750x.) 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.
8 • 750x OWNER'S MANUAL