One difference there is that the aluminum Powerbooks all used 802.11g cards, while the Titanium has an 802.11b card. The Titaniums also had some really bad reception issues, so odds are it's not getting enough bandwidth to stream to the devices solidly unless you have the airport really close to the laptop. It's taken Apple many years to finally get wireless reception working well inside a metal case. Their iBook line was always fantastic for reception.