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Infinity Modulus Subwoofer Manual

Hi, I'm new to the forum and I have a big problem. I have a pair of Infinity Modulus speakers from the first 1990 series and I managed to buy their subwoofer used. Would anyone have a user manual and possibly a subwoofer service manual? Unfortunately the one who sold it to me had lost it and seems to be difficult to find.
Excuse my English but I am Italian and I corrected it with the translator
Thank you