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output of the Distortion circuit is followed by a Level contol circuit. The level circuit 
provides the output level control for both the PREAMP circuit and the DISTORT circuit.  

This allow you to balance the level of both the PREAMP and the DISTORT circuit in 
relation to each other.  The second advantage of this design is that when using the 
PREAMP circuit to overdrive the DISTORT circuit the PREAMP output level will not reduce 
the impact of the full gain available to overdrive the DISTORT circuit.  In this confiuration 

you can use the gain of the PREAMP to full advantage to overdrive the DISTORT circuit 
and still have the ability to balance the output levels between the individual PREAMP and 
DISTORT circuits when used individually.  The output of the Level block feeds the input 

of the DECIMATOR G-String II noise reduction circuit.  As can be seen, the level 
dectection and control circuit of the Decimator is connected directly to the input buffer 
allowing direct instrument tracking and also allowing the Threshold setting to be based 

on the noise of the instrument before any EQ, gain or distortion is applied.  The actual 
noise reduction circuit is the last circuit in the signal path allowing a single threshold 
setting for all functions of the THETA pedal.  This means you can switch from the clean 
PREAMP to low gain and even high gain plus ultimate gain with both the PREAMP and 

DISTORT circuit in use and still eliminate all of the noise at the output and all with one 
threshold setting.   
 

PREAMP CIRCUIT 

 
   
 

 
 
 
 

 
 
 

 
 
 

 
 
 
 

 
 
 

 
 
The PREAMP is a clean preamp that can be used as your clean channel and or a front end 

Preamp with Gain to overdrive the DISTORT circuit for incredible sustain and gain.   
 

PREAMP 

ON LED

 

This led located above the PREAMP FOOTSWITCH indicates when the clean PREAMP 

is active and in the signal path.  

 
 

 

Summary of Contents for THETA

Page 1: ......

Page 2: ...ollow all instructions Do not use this unit near water in the rain or where there is moisture If this warning is ignored a serious electrical shock or death may occur Do not attempt to service this unit No user serviceable parts inside Refer servicing to qualified ISP approved personnel Servicing is required when the unit is damaged in any way such as power adaptor is damaged liquid has been spill...

Page 3: ...ear panel has 4 inch phone jacks with one for the guitar input one for the final output signal and two remote jacks which allow the THETA preamp pedal to be switched remotely by switch closure pull to ground or with relay functions under MIDI control The PRE DIST jack allows remote control switching ON and OFF the Clean Preamp by swithing to ground the TIP connection of the inch jack The Distort s...

Page 4: ...equency semi parameteric equalizer which includes a boost cut control plus frequency sweep which will be described in more detail in the PREAMP section The output of the EQ section feeds a gain circuit allowing adjustment of the gain of the clean preamp by up to 50dB The output of the clean preamp is fed to the input of the DISTORT circuit The first section of the Distort circuit is a multi stage ...

Page 5: ...G String II noise reduction circuit As can be seen the level dectection and control circuit of the Decimator is connected directly to the input buffer allowing direct instrument tracking and also allowing the Threshold setting to be based on the noise of the instrument before any EQ gain or distortion is applied The actual noise reduction circuit is the last circuit in the signal path allowing a s...

Page 6: ...2db of boost or cut to be applied at the frequency determined by the SWEEP control 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 NOT...

Page 7: ...YSTEM Low Level Downward Expansion is performed by use of a high quality voltage controlled amplifier controlled by an RMS based audio level detection circuit A Time Vector Processing circuit is used which varies the release response over a 1000 to 1 ratio and controls the release response of the Downward Expander The release response will be extremely fast on the order of 2 milliseconds if the in...

Page 8: ... amount of GAIN Most players will use GAIN 1 for a low level GAIN setting and GAIN 2 for high GAIN BASS This control adjusts the amount of boost or cut in the low frequency portion of the spectrum of PREAMP The available BASS boost and cut range is 15 decibels Note the Bass control is flat when the control is centered at 12 00 MIDRANGE BOOST CUT CONTROL This control works in conjunction with the S...

Page 9: ...ill not have any effect on the signal since there is no boost or cut being applied TREBLE CONTROL The TREBLE control adjusts the boost or cut that is applied in the high frequency portion of the spectrum of PREAMP The available TREBLE boost and cut range is 15 decibels SETTING THE THETA CONTROLS GETTING STARTED It s best to start with a flat response and adjust from that starting point The THETA c...

Page 10: ... and 3 00 This will provide a more classic rock tone By pulling the midrange control back between 8 00 and 12 00 you will get a more scooped midrange response Sweep the midrange frequency with the MID control in cut between 8 00 and 11 00 to find the desired mid scoop and then add BASS and TREBLE to suit PREAMP OVERDRIVING THE DISTORT FOR MASSIVE GAIN For incredible GAIN and that over the top meta...

Page 11: ...THETA SPECIFICATIONS Input Impedance Maximum Gain PREAMP DISTORT Treble Control PREAMP Treble Control DISTORT Bass Control PREAMP Bass Control DISTORT Mid Sweep Frequency PREAMP Mid Sweep Frequency DISTORT Mid Boost Cut Range PREAMP Mid Boost Cut Range DISTORT Decimator Effective Noise Reduction Dimensions Weight Power 500k ohms Greater than 150db 15db at 10Khz 15db at 10Khz 15db at 80Hz 15db at 8...

Page 12: ...y repack the unit send a copy of the original receipt a note stating the problem and send it to ISP Technologies LLC 5479 Perry Drive Unit B Waterford MI 48329 Attn Repair Dept All shipping charges must be fully prepaid ISP will not be responsible for any damages incurred in shipping of any unit Any claim will need to be settled with the shipping company The warranty will be voided if the serial n...

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