ISP Technologies THETA Head - Manual (Page 8)

6. SWEEP FREQUENCY CONTROL
This control works in conjunction with the MID boost/cut control and adjusts the
center frequency of the MID boost or cut signal. At the full counter clockwise setting
the midrange frequency will be at 300Hz, at the full clockwise setting the center
frequency of the midrange will be at 6KHz. NOTE: when the MID control is set at
12:00 straight up the SWEEP will not have any affect on the signal since there is not
boost or cut being applied.
7. TREBLE CONTROL
The TREBLE control adjusts the boost or cut that is applied in the high frequency
portion of the spectrum of DISTORTION CHANNEL. The maximum TREBLE boost and
cut range is +/-15 decibels.
8. REVERB LEVEL CONTROL
The REVERB control adjusts the amount of digital reverb that is added when using the
DISTORTION channel. The digital REVERB in the THETA amplifier has a bandwidth of
18KHz and also includes a digital implementation of the Decimator noise reduction to
ensure that the digital reverb has a dynamic range greater than 110db.
9. DECIMATOR NOISE REDUCTION
The DISTORTION channel DECIMATOR control adjusts the threshold of the CLEAN
channel noise reduction. The DECIMATOR noise reduction is a down low-level
downward expander incorporating ISP‟s patent pending TIME VECTOR PROCESSING.
Setting the Decimator Noise Reduction System:
Setting the Decimator Threshold for proper use with the Distortion channel is easy if
you follow these instructions. Set the Decimator Threshold full counterclockwise.
Adjust the Distortion gain and Preamp2 gain as desired for your playing. Slowly
increase the Decimator Threshold until the background noise just disappears. This
will be the best possible setting for the Decimator. Increasing the Threshold beyond
this point will cause expansion to be more aggressive than desirable. Some
experimentation may be required to get the best possible Threshold setting.
10. LEVEL CONTROL
The LEVEL control adjusts the output level of the DISTORTION channel. NOTE: The
final output level is determined by the setting of the DISTORTION LEVEL and the
MASTER LEVEL CONTROL.
THETA MASTER CONTROLS
1. DECIMATOR IN/OUT SWITCH
This master DECIMATOR IN / OUT switch activates both the CLEAN channel and
DISTORTION channel DECIMATOR noise reduction systems.