@Krishroy2004 I could not find any info on the above speakers. So i am guessing a bit. If the system has an amp built into the subwoofer and powers the 2 speakers, i would be careful about going and plugging the same speakers in the Yamaha. These speakers usually have very low impedences and also have very low power handling capacity like 10 watts or so. The amp might just fry the speakers or the speakers might in return damage the avr.
I could be completely wrong about this.
If you can provide some specs of the 2.1 model, we can dig a bit deeper.