ISP Technologies THETA PRE AMP User Manual

INTRODUCTION

Congratulations on your purchase of the Theta stand alone pre-amplifier. You are now the
owner of the most innovative guitar amplifier ever produced. The same innovation and killer
sound that you can find in our Theta Head and Theta Combo is now available in one smaller
package and is ready for low-end players and shredders of all kinds.

Please read this manual carefully for a through explanation of the THETA Pre-Amplifier and
its functions.

PRECAUTIONS

NOTE: IT IS VERY IMPORTANT THAT YOU READ THIS SECTION TO PROVIDE YEARS OF
TROUBLE FREE USE. THIS UNIT REQUIRES CAREFUL HANDELING.

All warnings on this equipment and in the operation instructions should be adhered to and all
operating instructions should be followed.

Do not use this equipment near water. Care should be taken so that objects do not fall onto and
liquids are not spilled into the unit through any openings.

The power cord should be unplugged from the outlet when the unit is left unused for a long
period of time.

DO NOT ATTEMPT TO SERVICE THIS EQUIPMENT. THIS EQUIPMENT SHOULD BE SERVICED BY
QUALIFIED SERVICE PERSONNELL ONLY. DO NOT MAKE ANY INTERNAL ADJUSTMENTS OR
ADDITIONS TO THIS EQUIPMENT AT ANY TIME. DO NOT TAMPER WITH INTERNAL
ELECTRONIC COMPONENTS AT ANY TIME. FAILURE TO FOLLOW THESE INSTRUCTIONS WILL
VOID THE WARRANTY OF THIS EQUIPMENT, AND MAY CAUSE A SHOCK HAZZARD.

POWER REQUIREMENTS

This unit requires connection to a 120 volt AC outlet. Do not cut or disconnect the ground pin
on the power cord. Do not attempt to connect this unit to any power source other than the
specified 120VAC. The Theta Combo will typically draw approximately 3 amps of current when
driving a 4-ohm load.

FRONT PANEL

Understanding the THETA amplifier

THETA PREAMP1

1. PREAMP1 ON LED

This led indicates when PREAMP1 is active and in the signal path. NOTE: The PREAMP1
switch on the FOOTCONTROLLER switches PREAMP1 on and off. PREAMP1 is
functional only when the CLEAN channel is selected. PREAMP1 and PREAMP2 will
automatically switch with the channel selected.

2. PREAMP1 GAIN CONTROL

This control adjusts the amount of gain in the signal path of PREAMP1.

3. BASS

This control adjusts the amount of boost or cut in the low frequency portion of the
spectrum of PREAMP1. The available BASS boost and cut range is +/-15 decibels.

4. MIDRANGE BOOST/CUT CONTROL

This control works in conjunction with the SWEEP frequency control 5. The MID and
SWEEP controls work together to provide a semi-parametric tone control. When the MID
control is set at 12:00 straight up there is no boost or cut in the MID frequency portion of
the spectrum. The graph below shows the response of the MID boost/cut and SWEEP
controls. The MID control allows +/- 12db of boost or cut to be applied at the frequency
determined by the SWEEP control.

5. 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.

THETA PREAMP2

1. PREAMP2 ON LED

This led indicates when PREAMP2 is active and in the signal path. NOTE: The PREAMP2
switch on the THETA FOOTCONTROLLER switches PREAMP2 on and off. PREAMP2 is
functional (active) only when the DISTORT channel is selected. PREAMP2 and
PREAMP1 will automatically switch with the Distort or Clean channel is selected.

NOTE: ALL OF THE REMAINING FUNCTIONS OF PREAMP2 ARE IDENTICAL TO
PREAMP1 AND WILL NOT BE REPEATED.