Is there a 'noise canceling' device that can effectively cancel bar room karaoke in the 120-130 decibel range?
There's no specific 'noise canceling' device that you can use to effectively cancel bar room karaoke. The only workable option would be getting a noise reduction karaoke microphone. Check out some of these karaoke microphone brands at http://en-us.sennheiser.com/microphones/vocal-presentation/karaoke.
Not sure what you're asking for ... but if you're looking for a device that would "silence" the noise of somebody singing karaoke ... I wish there was, but the only way is to turn off the mic and hope everybody talks over themLOL
They sell noise-cancelling headphones, but those would cancel everything.
Have you tried earplugs? They have all kinds. I don't know much about them, though, except they help me sleep a lot.