@roddyboy
You might be able to answer your own question. Someone made the investment in these particular Lawrence Audio speakers (orig retail of $28.5k, some used under 8k now days), and made the investment in Golden Reference speaker cables so far (not cheap), right?
Those are fairly sophisticated speakers. Not just something you throw some wire on. Unless you are simply testing to try something out for fun, why would you not eventually use comparable speaker cabling to what you have now for bi-amping. Using some "spare 18-gauge wires" isn't adding up. Is it spool wire from a hardware store, or speaker cabling. Share more of the story here to get better advice.
You might be able to answer your own question. Someone made the investment in these particular Lawrence Audio speakers (orig retail of $28.5k, some used under 8k now days), and made the investment in Golden Reference speaker cables so far (not cheap), right?
Those are fairly sophisticated speakers. Not just something you throw some wire on. Unless you are simply testing to try something out for fun, why would you not eventually use comparable speaker cabling to what you have now for bi-amping. Using some "spare 18-gauge wires" isn't adding up. Is it spool wire from a hardware store, or speaker cabling. Share more of the story here to get better advice.