Foobar2000 has a tone generator which would be ideal for this task.

On Sat, 04 Jun 2005 12:06:20 +0100, maarten de boer <mdeboer@iua.upf.es>
wrote:

>> 3. Or maybe there's an easier way to find out the phase of a set of
>> speakers?
>
> Play a mono sound, and put the speakers facing eachother. The sound
> will cancel out (become lower volume) if the speakers are out-of-phase,
> and louder when the speakers are in phase.
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