[dentifyindel]

Is the speaker out on the field kit not working a known thing? Or am I just unlucky?
Got my field kit a couple of weeks ago and it all seemed fine google doodle baseball. I got the expansion kit today, plugged the speaker in and nothing. The speaker itself is working, I've tested it with other things.
Now looking at having to return the field kit, but if this is going to be a recurring thing then I would be as well getting my money back.

The fact that the speaker works with other devices is a good sign, as it helps narrow down the problem to the Field Kit itself. Since you just purchased the extender and it is a new device, the most likely cause is a faulty connection at the speaker output of the Field Kit or a wiring problem within the speaker itself.