Try looking on eBay. There are a lot of ads for subwoofer amp repairs.
Rel "legacy" subs and fixing the amplifiers.
I have a REL Stadium 3 sub and it hums (60hz) when powered on with NOTHING attached to it. I took out the amp and could see nothing obviously wrong and went on line for some information. Called about a local tech who I trust taking a look. It is a pretty simple amp, Was told that REL does not provide schematics so he wasn't sure about fixing it. So I called REL in CA and was told that REL no longer supports "legacy" models. REL was at one time a high end company that made good/very good stuff and provided excellent service. WTF? I have been all over the web and have yet to find a way to get my amp fixed. I like the Stadium 3 and especially the wood cabinet and want to keep it going. REL offers sum small $ towards a new REL but why would I want another REL? The amp is a single board and probably needs the filter capacitors changed out (several sources on the web). Can anyone help? Has REL gone the way of Bose which I am told doesn't service earlier models? Let this also serve as a warning about buying an older REL that no one seems able to fix. I now look at my REL G-1 and see it as a disaster in the making.