As per this question, we whisper the statement Baruch Shem Kvod Malchuto L'olam Va'ed duirng shma (except on Yom Kippur). But what about when we say the phrase not as part of shma? Do we whisper it then?
When I put on my shel rosh, I say the phrase. Should I intentionally be lowering my voice at that moment or does the phrase only require special whispering when it is part of the shma?