Israel4664

Like an above poster stated, it depends on how it's implemented. Some have a basic opamp circuit(that really isn't much better if at all than a basic portable amp), some have headphone outs that's driven off the speaker outs, and some flagship receivers or high end integrateds even have a discrete headphone amps, that maybe on par with midfi headphone amps. So it really just depends and you never really know unless you contact the manufacturer and they are willing the share the specifics. If all things are equal, then the only real advantage would be space. Even the larger dedicated headphone amps are small in comparison to small integrateds.