Hi guys,
I was thinking if I could test my song in different speakers just by using AudioEase's SpeakerPhone software. Will that be possible? Whenever one produces a song, he/she needs to listen to different speakers so that it sounds nevertheless almost same. So can SpeakerPhone produce a true result?
kinda, not really.
speakerphone will give you an approximation of what the speakers sound like but not the environment.
for example, a car stereo system: speakerphone will give you the sound of the song through a car stereo, through your own speakers, in your room, which doesn't really add up to a realistic representation of a car stereo system.

your speakers and room will always be a major factor.