Eminence is legally prohibited from giving full specs for OEM third party speakers, as that is tied to a contract. Not just Eminence, that is a business requirement in general. For speakers like these Tony would give a ballpark power handling based on V/C diameter.
Being a 'Legend' supplied to Peavey and looking at the dust cover and magnet diameter I would put this speaker at 75w - 100w rms, given that it is theoretically a bass speaker. If it was a 10" it would be 75w, replacing the Sheffield 10's Peavey used. I have the Peavey speaker item code sheet covering these and will update on what it actually is. I'm not familiar with any Peavey bass guitar 12" cabs so it might be a pa woofer or full range.
Tony gave me a bit more than just that. I had three 10” Eminence speakers and need one more to go in a MM 4x10 HD130. I had a little Crate cab that had housed a low output solid state amp. I had kept the cab because it is a dove-tail joined pine cab. The speaker was a large magnet…for a little SS amp, but it was an OEM speaker for the amp that came from Eminence. I asked Tony if it would be a good match for efficiency and tones. He told me that yes, it would work well with the three speakers I had…similar efficiency, similar freq range, similar resonant peak. He gave no specifics…just general info About two different OEM 10s. That the speaker out of that little 10 watt Crate SS amp was a a 100 watt speaker!! Lol
Eminence did not make any money directly off of that service that Tony provided that day, but a long time customer was happy.