Sorry I am having a hard time finding data for the speaker.
The speaker is NOS, from SWR factory close out I bought from a local builder. The speaker its self is 10" 8 ohm, 250 watt Eminence Megoliath. That's all I could find out for now. I went to the Eminence website but no info is available. I emailed their tech for a spec sheet but they are closed for a holiday today here in the US.