Guided Tour - HA4000 Front Panel
1. Audio Mute switch - When pressed in (down), all of the HA4000 outputs except the
rear-panel Tuner Out (see #8 on page 8) are temporarily silenced, muting the audio signal
and allowing you to easily tune your bass between songs. To restore audio signal to all
outputs (including the Tuner Out, which is always active), simply press the Audio Mute
switch again so it it in its “out” (up) position. A similar function can be provided by a
footswitch (see #3 on page 7).
2. Inputs - Connect your bass guitar to one of these standard 1/4" unbalanced jacks.
If your bass has passive electronics (that is, if it has no battery), connect it to Input 1, which
is designed to handle low-level signals. If your bass has active electronics (that is, if it has
a battery), connect it to Input 2, which employs a 10 dB pad and is designed to handle
hotter bass pickup signals.
3. Volume control - This is the overall volume control. For best signal-to-noise ratio, keep
the output of your bass at or near maximum and set the HA4000 Volume to the desired
level.
4. Shape control - In conjunction with the Intensity control (see #5 below), this control
applies a specialized 20 dB notch filter to the specified frequency area so that you can
customize the effect of the Shape curve to best complement your particular bass
instrument. Moving the Shape control clockwise causes the notch filter to be applied to
higher frequencies, while moving it counterclockwise causes it to be applied to lower
frequencies. At the fully clockwise position, the filter is applied to the 1 kHz frequency
area; this will act to attenuate mid-range frequencies and give your bass a deep, low tone.
At the fully counterclockwise position, the filter is applied to the 90 Hz frequency area; this
will act to attenuate low frequencies and give your bass a biting, trebly sound. For more
information, see the “Using Equalization and Shape” section on page 11 in this manual.
5. Intensity control - Determines the degree to which the Shape curve (set with the
Shape control; see #4 above) affects the signal; the higher the Intensity, the greater the
effect of the notch filter. When set to 0, the Shape curve has no effect.
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