From another site:
"Well we definitely knew FROM the start that we would see better performance
coming FROM the Axis-712 as it uses Digital whereas in the Axis-711 we see
only mono, does this make the Axis-711 a bad buy or a bum deal? Absolutely
not, in fact the Axis-711 is probably much more practical in an office or in
an environment where you would need to be able to listen to something with
one ear and still be able to hear your surroundings.
I feel the Axis-712 would be a better purchase over the two besides the
price difference just as it does offer the dual headphones as well as
offering up a better quality, clarity and performance. This does not mean I
would write off the Axis-711 as it does offer some great performance for the
value and if it’s only basic functionality your looking for this set will be
more than enough performance. Overall I give both products two thumbs way up
and rate the pair at 5 bananas, I would definitely suggest the pricier
Axis-712 over the two but still feel the Axis-711 offers what you pay for. "