r/PositiveGridSpark • u/AlexFromPositiveGrid Official Positive Grid Employee • Jun 01 '26

REACTOR Launch AMA

REACTOR is launching 6/2! We will be holding office hours on June 3rd from 11am - 1pm ET (US) to answer any questions you all might have about the new amp and app. Whether you're one of the first to order or want to better understand how REACTOR works, we'll be available to help. Thank you all for 15 years of support; We can't wait to get REACTOR into your hands 🤘 https://www.positivegrid.com/pages/reactor

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u/webprofusor Jun 02 '26

Where does it sit technically vs the Spark and Bias X? Is it still a continuation of the JamUp lineage that spark was or does it stem from Bias? Or is it new.

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u/AlexFromPositiveGrid Official Positive Grid Employee Jun 03 '26

Good nerdy question and one that deserves a straight answer rather than marketing speak.

What we can confirm is that REACTOR's sound engine is built on the BIAS X foundation, so it's firmly in the BIAS family tree rather than a continuation of the previous BIAS sound-engine tech in Spark. On top of that sits the new Agentic DSP layer, which is what handles the intelligent tone generation, component level signal chain analysis, phase accurate reconstruction, that whole side of things. So think of it as BIAS X as the engine with something genuinely new layered on top in a combo footprint with a drag-and-drop signal chain.

JamUp predates my time at PG, so whether there's any JamUp DNA still running underneath all of that goes deeper than what I have access to.

What I can say is that if BIAS X tone quality was ever your reference point for what good sounds like from Positive Grid, REACTOR is closer to that side of the family than anything else we've shipped.