Simon,
You don't mention the speaker cables you're presently using. Do you have a extra 5" of slack? Consider snipping off a piece and making jumpers that are sonically consistent with what you already have. Terminate with spades, banannas, bare... however you choose. If you like your present speaker cables, you avoid any potential lack of sonic difference. Though that could be a good or a bad thing.
As an aside, I've found that where you terminate the speaker cables, which terminal you jumper to, will change your subjective ascessment. I generally prefer to wire the speaker cables to the 'tweeter' terminals, and jumper from the tweeter terminals to the woofer terminals. YMMV.