This ambiguity is the first red flag. When a product’s very identity is up for debate, downloading firmware for it is like trying to buy a key for a lock you can’t describe. Assuming you’ve identified your device, the hunt for the firmware becomes a digital archeology project. Official channels are sparse. PSI Audio, known for their analog, no-DSP philosophy (their monitors famously contain no digital conversion), rarely pushes public firmware. If a PSI product does require an update, it is typically done via a proprietary USB dongle or a dealer-only tool.
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The other, more plausible theory? The "S2" refers to a specific for a broader PSI product line—perhaps the firmware version 2.0 for their AVAA active bass trap or a legacy controller. psi s2 firmware download