Hello. When listening to my KT-9900 (euro version of 8300) I cannot hear the difference between wide and narrow. I can tell that the circuit is working to some degree because pushing the button to narrow mode cleans up the signal a bit. That much I hear. But going wide does not translate into a more spacious sound. I own a few tuners that have wide/narrow and the sound difference is very obvious. Not so with this tuner. I wish that I had a 2nd KT-9900 to compare with. So I throw this out to any owners that might help by giving a listen and letting me know what you hear. Thanks for your comments.