Several groups are using an AV123 upgrade tweeter marked 842001 and need some info. The dc resistance (Re) is 4.8 ohms, and below are the impedence curve and frequency response curve.
Notice the peak around 700Hz. This means that this tweeter can be crossed quite low- perhaps even 1500Hz. 2100-2200 Hz would be very safe.
The FR curve shows an effeciency of around 92 dB's measured at 1W/1m. It should work well in a wide variety of projects.
