DIY Speaker Jumpers Question

I'm creating some jumpers right now. If I crimp the spades, should I also flow solder into the front end of the spade to prohibit oxidation? The rear of the spade is where the wire is crimped in. Or is oxidation not an issue and/or adding solder makes it sound worse?
 
If you are using the manufacturer's proper crimping tool for the lugs (usually quite expensive),
no solder is needed because the connection will be gas tight. Otherwise it's probably best to solder,
but keep the solder clear from the flat surface of the lug.