A customer has reported that they used this speaker from Amazon to replace the one on Teracube 2e (bottom speaker). Posting it here for folks looking for the speaker component.
This speaker worked for me, helped me get my phone back going after I accidentally damaged my speaker while replacing my screen. I had no audio other than via the headphone jack. This solution was offered to me by Support as an alternative to waiting for them to have the parts available for repair.