The magnets are supposed to be on the outside of the frame and wire them parallel as in instructions say. Jim.
Visit Soundtraxx's website...bottom right corner of the home page...Quick links/manuals/installation guide/pages 23-24.This will answer the connection part of your answer.
I have a silver series Atlas Dash 8 that I am adding sound and DCC to. I have both of the speakers, 1.25" QSI speakers, and when I mount them in the a frame the magnets in the speakers repel each other. I don't want to force them together and destroy the speakers but maybe that is the correct way to house them. In an atlas locomotive with a frame speakers, do both speakers face pointing inward and the contact wires are on the outside of the a frame? Also, the decoder manual i have suggest parallel wiring for the speakers, is that still right in this configuration?