Yes, that's exactly what I mean. The metal tongues should be firmly tightened, not with too much force of course, you do it with your hands and without pliers. If the metal tongues are nice and tight, there will be no micro-vibrations and the sound will be stable. You can try it out by ear whether you plug plus and minus into the connections for the tweeter or for the bass. I have found that it sounds "rounder" if you use the bass terminals. But some manufacturers, such as Tannoy, recommend the tweeter terminals. It's up to your ears. The difference is only very subtle.