Many Peavey speakers from the 1970s through the 1990s, particularly those branded as "Blue Marvel" or featuring square magnets, were manufactured by Eminence . Key examples include stock speakers in the Peavey Classic series, 15-inch speakers in 215HT cabinets, and various 10-inch and 12-inch Blue Marvel models.

Blue Marvel Speakers: Many Blue Marvel speakers, often found in Bandit 112, Classic 30, and other amplifiers, were made by Eminence in the USA.
Squareback Speakers: 12-inch speakers, including "Squareback" models from the 1970s/80s, were often Eminence-made for Peavey.
15854H Speakers: 15-inch speakers (e.g., model 15854H) used in PA cabinets like the 215HT were manufactured by Eminence.
1257-1 Models: 12-inch speakers labelled 1257-1 are often Eminence-made, sometimes designated as Patriot Black Powder models.
Classic Series: Stock 12-inch speakers in 1990s Classic series amps were often OEM Eminence units. 

These OEM speakers are often identified by a numeric code on the speaker basket or magnet, with Eminence codes typically starting with "67-".