Soundqubed HDS Series 4" Coaxial 2-way SpeakersSoundqubed HDS Series Coaxial Speakers! The HDS Series has stood for, Heavy Duty Street Series, since day one. This is exactly what we expect from the HDS coaxial series speakers. These speakers provide the ability to upgrade your current stock door speakers, to something that can handle more power, look good, and do it all while maintaining a budget. This is Soundqubeds entry level coaxial speakers. We do offer a more robust, larger power handling