I have used it on non McIntosh speakers and I cannot think of a time I didn't like it. The manual will warn you that using with other brand of speakers can lead to over driving the woofers. The only way I really see that happening is if you have the bass control on your preamp set pretty high, maybe the loudness feature on, and trying to play at loud level. If you add the eq, start with your preamp set to flat, engage the EQ and then adjust the preamp as you see fit. Long story short, unless you buy a unit that is a lemon, it's hard not to appreciate owning one, especially if you already own other McIntosh Equipment. It's a beautiful piece. If the person you are buying it from is shipping it to you, make sure they know how to pack them or it'll arrive with the glass broken and that really sucks. 🍻 BIGAZSPEAKERS.COM