AVS Forum Special Member
Join Date: Jul 2009
Location: northern virginia
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Subwoofer repairs often run $200-300+ and are guaranteed 30-90 days.
If you do a large number of Google searches on 'Acoustic Research S115PS Service Manual' you may find a site that has the service manual that you can download for a fee of $15-25.
After my S115PS died, I gave it to a high school kid to see if he could repair it.