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INTRODUCTION 

Congratulations on your purchase of the THETA Preamp Pedal.   The THETA Preamp Pedal was 
designed  to  provide  the  maximum  possible  over  the  top  performance.    With  a  front  end 

preamplifier,  a  full  complement  of  pre  and  post  gain  tone,  over  the  top  screaming  gain,  more 

than any preamplifier or pedal available plus a full Decimator II G-String noise reduction system. 

The THETA Preamp Pedal can be used as a dual channel preamplifier with both a clean preamp 

and distortion channel or with the front end preamp overdriving the distortion for massive high 

gain.  Both  Clean  and  Distort  sections  provide  noise  reduction  with  a  full  implementation  of 

Decimator II G-String noise reduction allowing the use of extremely high gain with absolutely no 

noise.     The THETA Preamp  Pedal  also incorporates ISP proprietary  “dynamic  gain  modulation” 

providing  a  dynamic  feel  similar  to  a  tube  amplifier  with  a  tube  rectifier.          Please  read  this 

manual carefully for a through explanation of the THETA Preamp Pedal and its functions.   

  

                                  

IMPORTANT SAFTEY INSTRUCTIONS 

 

Please read the following very carefully before operating this unit  

 

Read ALL instructions carefully before using this unit. Keep these instructions for future reference. 
Heed all warnings and follow 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 spilled into the unit, the unit has been exposed to rain or 
moisture, does not operate normally, or has been dropped. 

 

Care should be taken to avoid to spill any foreign objects or liquid into this unit. Avoid exposure of 
this equipment to dripping or splashing and ensure that no objects filled with liquid, such as vases, 
are placed on the equipment. 

 

Only use accessories or attachments that are specified by the manufacturer. 

 

Failure to follow these instructions may void the warranty. 

 

 

 
 

 

 NO UER SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED ISP 

TECHNOLOGIES SERVICE PERSONNELL. 

                                       

The lightning bolt triangle is used to alert the user to the risk of electric shock. 

 

The exclamation point triangle is used to alert the user to important operating or 

maintenance instructions. 

 

 

POWER REQUIREMENTS 

This unit requires the connection of the external AC Power Adaptor to a 120 volt AC outlet.  

Do not attempt to connect this unit to any power source other than the specified 120VAC.   
The THETA Preamp Pedal will typically draw approximately .5 amps of current.  

 

 

 
 
 

Содержание THETA

Страница 1: ......

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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