Altec Lansing says: Altec Lansings new XM3120 speaker system is engineered specifically for XM Radios Delphi Roady XT and Audiovox Xpress receivers. Now, XM users can listen to their favorite satellite radio stations everywhere from the dorm room to the garage. The system contains specially engineered drivers to deliver a full spectrum of pure, distinct sound, as well as bass enhancement technology that pumps out quality bass without the need for a subwoofer. Its contemporary design and compact size make it an ideal accessory for any room in the home or office. And, it includes a 20-foot home antenna for exceptional reception no matter your location.