I have the Acoustic Energy M 2.1 speaker package connected to a ROKU soundbridge using the 3.5 mm jack and am very pleased with them. I would like to connect them to an amp to use with other components. The speakers come supplied with a speaker-level to line level cable but I cannot find any info about using this cable. There is nothing in the 1 page user guide. Tried sending an email to Super-Fi support but got no answer. The cable has a pair of phono plugs on one end for plugging into the subwoofer. On the other end are a red and a white wire with stripped ends plus a black wire with a single phono plug - I assume this is ground for both channels. Any help is connecting these to the speaker terminals on a stereo amp would be appreciated. Thanks.