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(Having just denoted myself as Goofy re: electronics in another post this morning, I do feel qualified to ans. here.) What you want to do is very common.  Here is a picture from the Soundtraxx Tsunami installation page for reference.  More examples are avail. from their manuals online or elsewhere. <IMG src="http://i168.photobucket.com/albums/u172/dcrane_2007/multiplespeakers.jpg" mce_src="http://i168.photobucket.com/albums/u172/dcrane_2007/multiplespeakers.jpg"> I have wired many many multiple speaker setups...including some in various locations/different cars. You can wire your speakers in series as you say.  This is best, because, as the illustration notes, you will produce 16 ohms for the pair and halve the load on the decoder.  If you wire in parallel (still possible) you will run the chance of perhaps damaging the decoder as you will have doubled the load. When I have 2 or 4 wired in series I will turn down the volume as needed since the load has been reduced. When I wire speakers in differenct cars (or with the decoder in a loco and speakers in a dedicated "sound" car that is coupled do it, I have to connect the leads between cars with mini connectors avail. at most train shops or online somewhere like Litchfield station.com.  This can be a bit of a nuisance as the wires are visible leading from car to car (exiting and entering through tiny holes I drill in the floor of the trainling car and of the loco.  And they are tiny little devices to get ahold of and connect and disconnect.  In an F unit you may get away with permanent wired setup if you plan to always have the units coupled or drawbarred together.  But that would be a nuisance if you ever need to do repair or maintenance on the units.....which you probably will.  So go with some connectors. Sometimes there are convenient holes avail. already down low on the loco.....near the MU hoses or something.  But just as often in is a chore to route the leads around the loco weight and down to where they should exit unobtrusively.  The weights inside a narrow body loco can be so tight to the shell that I need to cut a channel down the side of the weight to near the bottom/back of the shell. F units like yours can give better results with routing wires as you have more room in there. Short answer: it can be done.  I have three F units with the speakers or extra speakers in the trailing B.  unit. Oh, don't forget.  the Tsunami in the illustration has a built-in speaker capacitor.  You will need to add your own cap. if necess...and you must pay attention to the polarity of the speaker leads when mulitple wiring.  If you don't see polarity on the speaker you can figure it out <IMG src="http://i168.photobucket.com/albums/u172/dcrane_2007/polarity.jpg" mce_src="http://i168.photobucket.com/albums/u172/dcrane_2007/polarity.jpg">
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