Yup, its an hsdc. Over the years I've put around 6k hours split between a b2920, lx3310, l3200, l3400, l3540, and 2 l6060's and I'd say even with the cab that the hst whine is the worst in the LX and nearly nonexistent in the l3540 and l6060. The grand L is superior in every way to all the...