........go where???

Installing a QSI Titan in an O Scale V & T 4-6-0. The group in the center are from the decoder and the groups to either side by the class lights are from the locomotive for:  R + L rail pickup (tender and locomotive); backup light LED; speaker in tender; cab light; firebox flicker(2 bulbs); class lights (2 bulbs); headlight LED and lastly a speaker firing up the stack in the smokebox. 

I have posted this in another forum with no response so thought I would try here.  Below is a rough track plan already install a few years ago.  I will be starting the reversing loop at the first turnout near the top left corner by the aisle and finishing it at the turnout just above it and slightly to the left.  Yes I know there are other ways I can do this.  My question is this, when I installed the track, each piece was its own block, both ends isolated by styrene, ditto with the turnouts.

Hey Guys,

King of cheap again...

I Found some brand new but "very" old Soundtraxx sound decoders. How old are they? They are so old that they have yellow shrinkwrap around them. The best I can tell, they were made in the late 1990s and are part of the DSD line which got mediocre reviews. For what I paid for them, I am not going to be too picky... If they work at all, I will consider the purchase successful.

Now, here is the real question... If the speaker is the wrong Ohm rating, am I going to blow out the decoder?