I am not impressed, the PDX series amps are indeed cool looking, stackable, and produce very low heat.

But they run class D circutry which reduces sound quality and they dont have any of the computer controlled features of hte MRD series =(

The voltage sensitivity is 4.0 as compared with 8.0 and 6.0 on the MRDs.

They do have a built in ground isolators that automaticly link and isolate the amp grounds with other stacked PDX series amps.

Bottom line, they are entry level cool looking(not as cool as the MRD series) and nothing special in the performance category.