If you are having a driver with nothing written on it, not even a manufacturer name, then above replies should work.
So called full rangers (wide band drivers)are best to be identified as suitable or not for your purpose is by trying a pilot run with temporary build or pseudo enclosures.
I do a dry test by tapping the cone lightly to understand its resonance frequency, damping of the driver. A dual cone (whizzer) is also a proof of it being a wide band driver.