Large speaker for O gauge DCC sound, It's a great sounding full range speaker with lots of bass. They measure 10x4.5x2cm. The driver measures 35mm.
I offer an alternative speaker which is exactly the same dimensions which you might also want to try. This can be seen in the second photo. There are more speakers available in my eBay shop.
*price is per speaker, the photo of two speakers together is for illustration only.