I have just downloaded a decibel meter. I hope it helps me lower my voice as I have the same issue. Thank you!! !
This thread makes me wonder if there may be technology that can be adapted to help.
Like some sort of portable, or wearable, decibel meter that can provide visual feedback (like a kanban (sign; visual signal) management system of sorts) that indicates when you're talking too loudly and need to make a conscious effort to reign it in.
*Googles*
Boom! It already exists in the form of apps for smart watches:
IMO, something like this would be well worth the expense to try if it means saving your relationship!
FWIW I sometimes have this issue and people tell me to lower my voice, and then I do. Sometimes it creeps back up and they get annoyed and remind me again. I don't take offence to it because I know they're only telling me because I can't control it myself.
edit: I noticed this thread has over 5,000 views so I clicked again to see when it was posted.. 2010. Decibel meters existed back then, but not in smart watch form. I think a smart watch & app would be far less conspicuous than a decibel meter sitting on the table in front of you. Technology can be pretty useful.