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I'm thinking you have an open shield ground on the RCA input side. Connecting speaker inputs possibly restores the ground. Try connecting the high level inputs then disconnect the remote end of the cables (floating the grounds).
Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.
It is and it isn't. I don't know what Item or era you are comparing the Axiom 80s too, but on the information given I can tell you that in the 60s Goodmans made high quality items and they were Made In England. Up until around the late 80s early 90s, the english factories closed and Goodmans items are now made abroad in either china or japan and IMO do lack their original build quality, much like Wharfedale.
I hope this answers your question
usually, it is background noise. Scratchy background noise. Gets worse the louder I turn up the volume. I ran a test on all the channels and it seemed to be the subwoofer channel. I've unpluged the subwoofer but that didn't help. I have also noticed that my receiver doesn't turn up nearly as loud as it used. I usually watch DVDs at a volume level of about 15 on my Denon and that's quite loud. But now, 15 isn't that loud at all. I went to Best Buy where I bought all of this equipment and they immediatly told me it was suge protector issue and wanted to sell me a high-end surge protector. Perhaps they are right but not sure why it began rather suddenly. Probably not helping you much.
It works fine for a couple of minutes the starts to hum. If you turn up the volume it masks the noise but is till audible, also the video switching cuts out. after examining the components I have seen some heat discoloration in the power suply area and believe it to be power for the video board. disconecting the ribbon cable form the video board the hum goes away, and so does any video wich does'nt matter for me because my monitor does all the HD video switching. hope this may help with some noise problems.
Try to see if the reciever will make the buzzing/noise without anything connected to it except power, and speakers. Tune into a local radio station and see if the noise continues. If the noise has stopped, then you know there is an issue with the player or cable.