Is it still possible to get the sound unit for the On30 Climax?
I'm guessing you are asking about the Soundtraxx Plug-n-Play module? That was discontinued a while ago. But a micro-Tsunami (or maybe even the full sized one, I'm not sure) will fit just fine.
I solder the appropriate wires from the Tsunami onto an 8-pin plug to make it easy. And I think it's the 1.1" speaker that fits; someone will correct me if I'm wrong.
Hope that helps!
Scott
Thanks Scott. That helps.