It really depends what kind of a load the speakers present to the amp section of the reciever. Try listening at the levels you like. If your sound starts getting "harsh", where the highs start to get painful (but the other frequencies are still okay sounding), that's the sign that your amp is starting to clip. This is a bad thing as it is possible to cook your drivers, especially that pretty titanium dome. If you find that you want this much volume or more, then it's time for external amplification. The good news is, the RX-V2500 is known to have excellent preamp outputs so you shouldn't have any issues as long as you use some high-quality external stuff.