Using Fierwire with External HDD and External Sundcard ??? One Port?

Hello! I have Extenral Hdd WD My Book Studio with 2 conections FireWire 800 and one USB 2 ... also I have external Soundcard with FireWire 400, both of them have POWER ADAPTER .......

My qustion its, Can I use my FireWire 800 Port in My MacBook Pro 13 inch Early 2011 with FireWire 800 HUB and connect in the same time my Ext. HDD and my Ext. Soundcard ( because they are have different protocols for using ) ...and did I have to find FIREWIRE HUB with power supply or I can use without power supply.