Unfortunately, we do not have a sample network which demonstrates SemiBlindICA at hand, but we suspect that the TAP_LOWFREQ value may be causing the problem.
This value needs to be set larger when the environment contains a long reverberation as described in the document: https://www.hark.jp/document/hark-document-en/subsec-SemiBlindICA.html
A spacious environment like concert halls/churches or setting a microphone array and a speaker apart from each other cause “a long reverberation.”
If these are not applicable, please give us more details of your working environment and parameter vaules you set on SemiBlindICA.
HARK Support Team