Mac,

Thank you again most sincerely for your advice.
I love the Y input idea together with running in conventional mode and will definitely take that approach.
I will also follow up on auto amplifier capacitors. I have seen various bits of car audio electronical, power amps, cabling and wiring and such at the auto parts stores but never paid much attention to the componetry on display as well (other than to shrink in horror at the prices some people are willing to pay for car audio bits that will win volume bake-offs of greater than 130dB,) but will seek out a capacitor.

Any suggestions of a size/rating capacitor given my existing bits?

Cheers from a very bushfire blackened Victoria, Australia.

John