The 3500s are some of our most sonically accurate sub-drivers. This accuracy comes from a low moving mass, ultra high energy design that uses a crazy strong motor with a highly focused voice coil gap. 3500 Series subs come with EROM or V-ROM surrounds, multi-layer spiders, 800-degree thermoset voice coils, and cast aluminum frames. All of these features combine to make the 3500 Series a brutally musical addition to our USA built lineup.