The ISP Technologies Theta X Preamp Pedal is a floor-controlled guitar system built around a fully programmable digital Theta preamp. Alongside that preamp section it carries a vintage preamp, studio-quality effects processing, and a built-in full-function precision tuner, so it is designed to cover preamp, effects and tuning duties from one unit1.
ISP is direct about what the Theta X is not. The maker's product description states: "This is not a modeling processor. The THETA X allows the player to create the best tone possible with incredible flexibility. The preamp section delivers more tone shaping and gain flexibility than any other processor available."1 In other words, the pitch is a programmable preamp platform rather than a collection of amp models, placing it among preamp pedals as much as among multi-effects pedals.
Power and practical notes
The Theta X runs on 9V DC with center-negative polarity and draws 1000mA1. That is a heavy draw for a single pedal-sized unit, so a power supply with enough current on tap is a practical requirement for any board built around it.
RockBoard PedalPedia lists the circuit type as analog, while ISP's own description calls the Theta preamp fully programmable and digital1. The two listings disagree on this point.
Where it sits in ISP's range
The Theta X shares its platform with the ISP Technologies Theta X DSP, which ISP classifies as a Multi-FX pedal2. Players looking at ISP's Theta line can also find related units such as the ISP Technologies THETA MSX DSP and the ISP Technologies Michael Sweet Theta Pro DSP.
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Sources (2)
- Theta X Preamp Pedal by ISP Technologies, RockBoard PedalPedia, 2026
- ISP Technologies, ISP Technologies
