The Fountek NeoCD3.5H is a horn-loaded low priced ribbon tweeter with great frequency response and sonic performance.
I’ve used the NeoCD3.5H both in conventional 2-way monitor designs and in 2-way M-T-M designs with great success.
As many small sized ribbons the distortion profile is rather high, but if the cross-over frequency and filter topology is carefully chosen the NeoCD3.5H is a nice sounding affordable ribbon tweeter.
For detailed measurements see: Fountek NeoCD3.5H