Performa F30 Crossovers
P/N# CO1-W
Midrange/Tweeter and Woofer Crossover boards.
They measure about 8" X 10" and were used in Revel stereo speakers.
$40.00 for two woofer boards and two tweeter boards.
Link to speaker manual:
http://www.revelspeakers.com/products/download-details.asp?ID=7&FileID=5