background image

THETA PREAMP PEDAL CONTROLS 

 

The upper row of controls are for the clean preamplifier. The last control in that row 

adjusts the threshold of the Decimator G-String Noise reduction. 
The lower row of controls are for the Distortion Circuit.  Three footswitches are provided 
with the first footswitch allows the player to select Gain1 or Gain2 in the Distortion 
section.  The second footswitch switches ON and OFF the clean channel preamplifier.  

The third footswitch switches ON and OFF the Distortion channel of the THETA pedal.  

 

            THETA PREAMP PEDAL REAR PANEL 

 

 

 

 

 

 
 

The rear panel has 4 ¼ 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 ¼ inch jack.  The Distort section is remotely 

controlled by switching to ground the RING connection of the ¼ inch jack.  The G1 / G2 
jack allows remote control switching between the GAIN1 and GAIN2 front panel control of 
the DISTORT section of the THETA pedal.  The Power Jack is connected to the supplied 

9VAC power adaptor.  The THETA pedal internally converts the 9 volt AC signal from the 

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...

Reviews: