Hi,
Not a good idea to wire speakers in series except for non-critical applications, because when you do, the impedance curves of the two speakers interact with each other causing potential changes in frequency response, none of which are desirable.
It's true that it will be an easy load for your amplifier, but it comes at the expense of good performance. Keep in mind that all impedance ratings of speakers are "nominal"--a kind of average. Few loudspeaker impedance curves are a nice straight line. In most cases, impedance varies with frequency across the audible spectrum, and it's those variations that will interact when you connect speakers in series.
Regards,
