[mulmen]

The next sentence explains why this is a problem.

> This means that sound can be muffled, because its drowned out by the incidental noise that comes from the left/right channel.

[chrisseaton]

Yeah I read the same comment you did, but if you're taking a signal with 6 channels, and only have two channels out, you don't really have any option but send the middle channel to both outputs, else it'll sound far too intense in a single ear.