The tech spec for the woofer says it is an active unit, meaning it has an in-built amplifier. This normally means it would take a line-level input. However, you mention that you are using your own AMP (14 years old) which is designed to power speakers which are passive. So, I am curious how you wired this woofer up to your existing setup. Can you elaborate on this?
The sub-woofer is connected via the sub-woofer Pre-out connection on the amp to the Line In connection on the sub-woofer.
The amp has individual level control for each surround sound speaker (centre deselected).
Thank you for all your input and comments, all useful to the aged brain box.
We have more and more laws, and less and less enforcement