Typically in almost all cases when it comes to receivers, what separates more expensive receivers from the lesser one (relative pricing), is usually and mostly is The power section and hence the current delivery will be higher along with the charge storage capacity (capacitance), for dynamic demands, with the added bonus of a feature or two or more.
The high end receivers will have a really good power section, however they will be no match to the power section of a good dedicated amplifier of the likes of Emotiva or Rotel or ....
Most if not all low end receivers, give wonderful features but usually compromise on power sections, hence they usually struggle to drive demanding speakers.