Sent by QuincyGriffin Twenty amplifier, an audio solution which connects Airplay features to non-powered speakers like the ones you've adopted. You'll still need to invest in an Apple Airport Express, which plugs into the amplifier unit.
Once everything is setup (Airport Express optical out to Twenty's optical in using the included cable, speaker cables to the back of the Twenty), you'll be able to use those D-1's like any other wireless audio speaker via iTunes/Airplay with 2.1 channel sound for 20 watts per channel via the Class D amplifier. Not bad for just $99 and with a much smaller footprint than a full receiver setup.
(Top Creative Commons photo: Andy List)