celtic, like the 7000 series, try the Mythos ST as small and crossed at 40hz. I have thoroughly tested the STS and the STS speakers and felt set as large the bass was very muddy but set to small and crossed it had fantastic bass, since you already have the sub, you may find it best to use it this way. If you buy the ST's try it both ways (large and small) but listen very carefully for muddy bass.