bi-wire cables on single binding post, sonic loss?

I am considering the purchase of a set of bi-wire cables although my speakers all have single wire binding posts (the cables on offer are just irresistibly priced). Since they are finished with spades, technically there should be no problem connecting them. Does anyone have experience whether I am likely to suffer sonic degradation or electric inconsistencies when recombining wires and piggy-backing spades, though? Thanks.