After packing up the Quintet III speakers, we paired the Klipsch Synergy Sub-12 with our much larger reference Dynaudio Contour speakers. Once again, the Sub-12's low-down authority--especially the superdeep, room-quaking frequencies--won us over. Compact 8- or 10-inch subs simply can't plumb the depths the way a mighty 12-inch sub can. One downside to 12-inchers is that they can sometimes soften definition compared to that of smaller subs, but the Sub-12 was surprisingly taut. Stand-up bass instruments sound quite detailed and pitch accurate. The Sub-12 provides notable oomph over its smaller 10-inch sibling, the Sub-10, while also meshing better with speaker systems. As with the Aperion Intimus S-10 and the Infinity CSW-10, the Sub-12 is a pleasure to the ears, even if it's not a treat to the eyes.