I have a 12-inch Powerbook G4 (the 1.5 GHz model, IIRC it is Rev. D) with built-in bluetooth and a Plantronics 510 bluetooth headset. The headset, although a bit outdated, is considered one of the very good BT headsets on the market and it works just fine with my phone. However, using the BT headset with the Powerbook results in a very low voice quality (both input and output).
I tried several VoIP programs, also recorded sound using Audacity -- the same low voice quality. Using USB headset with the same programs results in much better voice quality. I understand that a wired headset would produce better results, but the difference is quite significant. Also, the difference between the sound quality when using the BT headset with a cellphone and when using it with the Powerbook is huge. My hypothesis is that the Plantronics 510 headset for some reason doesn't work very well with the Powerbook, so I am looking to get another bluetooth headset.
Does anyone have any experience using other BT headsets with G4 powerbooks?