Speaker connections: Spade vs. Banana Plus

I use two different amplifiers, one of which only accepts a banana plug speaker connection, the other amplifier accepts only a spade connection. Unfortunately my speaker cables are terminated with a spade connection. Am I losing performance when I use adapters on the speaker cables to convert from the spade connection to a banana plug connection to the amp? I use a Rat-Shack adapter to convert from spade to banana.

Would it be advisable i.e. worth the $ to get a second set of speaker cables with banana terminations in order to maximize the sound quality?