I'm wondering if the SCREW-ON BANANA SPEAKER CONNECTORs are worth the effort (time, money) vs. using bare wire on the speaker and receiver sides. I've read a bunch of posts on the topic...some say it makes little/no difference .... other stating that the plugs are critically important. I've also read a few stating that if you go bare, solder the ends. Is this standard solder as in the type used for copper pipe fittings or some special type? Thks for any advise!