Hi M60,
The M60s can produce bass, but they are not great at sub-bass. The response is only down to 37Hz at -3db. Your Velodyne has about 20% more surface area on the sub, and is amplified on top of that (as is the Definitive Tech Speaker). Some people like music with heavy bass, and since you had the Velodyne already, you may have become really accustomed to it.
If you had you mains on large, the sub was not doing anything. Just try setting the mains to small with an 80Hz crossover (it only takes 10 seconds to make the switch). See how you like that sound.
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