Elias looked at the blackened badge on his workbench. He knew there were more units out there. And somewhere, someone was still listening to the ghosts they had trapped in copper wire.
It seems likely this is a typo or a string of numbers/letters from multiple sources (e.g., a York Audio speaker cabinet model, an M25SH driver code, and “IRS” possibly referring to Infinity’s IRS reference speakers or a parts inventory system). york audio kw 412 m25sh irs