zheka Messages: 80 Registered: June 2012 Location: Chicago burbs
Viscount
Thank you very much, Wayne.
The SPL meter I use is calibrated by Herb Singleton of cross-spectrum labs. I am not at all confident about my sound card though. I know for sure that it gives erroneous results in extreme LF region.
I will try a different sound card when i get a chance. But for now I am not going to worry about it. I do want to figure out what's going on with that speaker because, as you suggested, it maybe an indication of a bigger problem.