The 990 has the full upgrade treatment including:
- k47 Style Large Diaphragm Capsule
- jsSb Circuit Board with optional internal pattern switch
- Matte Red paint finish
The 991 is stock and unmodified. It can drastically improved by swapping the capsule with a SDC capsule from mic-parts.
- Mic-Parts improved headbasket for the 990 (looks better, sounds better)
- Internal pattern switch is accessed by unscrewing the body cylinder. In omni mode the signal level of the mic decreases about 6dB.
- The Mic Parts Headbasket does not have a Cardioid Emblem on the front as seen in some photos
Contact me if you have any questions about the mic.