The neodymium NTR06-1705B is the top of the line 6.5" Neo magnet midrange from Celestion.  You can expect full warm and extremely dynamic midrange with a strong vocal range and very high output potential from this unit.  Best used above 150hz if used with high power.  It stays full, never "thin" or carboard sounding like many of the car audio variety of "pro" mids can.  This is the "real deal" a true "pro" very well voice top quality speaker.  From car doors or stunt wall to 3-way home and pro audio cabinets and line-arrays, you will not be disappointed. 

This premium pro driver incorporates a 1-3/4" high temperature copper clad aluminum voice coil, and an FEA optimized flux distribution magnet assembly for low harmonic distortion. The "M-roll" cloth surround delivers progressive excursion control, generating a smooth frequency response. An intelligent heat management motor assembly and chassis enables reduced thermal distortion. The space efficient chassis profile is suitable for line array applications.