jloloOh yes. The XBL^2 design throws very hard, I'd say they dig nicely down to 50-60hz or so. I'm unsure where the rolloff is, but if you are using movie sources that go down to < 10hz (BSG or Tron soundtrack) you will benefit from a sub. Same with music like Skrillex. If you are just listening to Jazz or Classic rock, these sing and I run them in pure stereo direct mode.