I'm generally loving my new speakers, but the auto power off feature of the sub is proving deeply irritating. The sub switches itself off after 90 seconds of lack of bass soundtrack, giving an audible click. Does anyone know of a fix for this?
no I don't think so - the sub lead you bought connects your sub to your receiver/amp/processor but they usually have only one "connector".
You sub will usually have two high level inputs, marked L&R (not sure why they do this), the splitter cable will plug into the end of your sub cable but will have two "Connectors" which you plug into both inputs.
As I said this will make your sub auto on/off slightly more sensitive - it does work but your sub will still go into sleep mode after a few "quiet" minutes - I couldn't live with it even in it's slightly more sensitive incarnation.
I am not at all familiar with your setup but,
One possible solution if you are using the phono connection is to turn the sub output on your amp all the way up, to get the highest possible signal.
And then turn the volume control on the sub down to the correct listening level.
Just a thought.