Need info of EFI speakers.

I haven't seen it, but the owner gave me some idea: big and heavy with marble top, tweeter and mid are in brass enclosure, woofer (or subwoofer) down firing.
EFI emblem has big "E" with crown on top.

I believe this pair was made long ago.
If they are octagons as well, probably one of the many Empire loudspeakers from the early 70's.
It seems you knew it, yes, they're octagons.
Any idea sound quality ?