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I would second what Chuck has to say. I have both Magnapans and Dynaudio Audience 40s in my house. both are rated at 4 ohms, but they really represent different loads to the amp. The Magnapans are a true 4 ohm load and if I tried to drive them with a Denon, something would break, either the Denon or my beloved Maggies. NOT GOOD!
The Dynaudios, on the other had, are rather conservatively rated at 4 ohms, but over the audio spectrum, they only really dip down to 4 ohms at a couple of frequencies. Other manufacturers would probably rate them as a 6 ohm nominal load, so the Denon could do it, although with quite a bit of heat should I play them loud. Heat is the enemy of electronics.
I would check with the manufacturer of your speakers, or with your local dealer to find out what the load really is. Chances are pretty good that this will work, but you really need to check. Also check out the product reviews on ecoustics.com. They have thousands of reviews of products like speakers from all over the world. If someone reviewed your speakers, you may find that they will show measurements including the impedence curve. If it turns out that your 4 ohm speakers only dip to 4 ohms, you would probably be safe. It is also likely that the review itself would comment on the impedence curve (this is how I learned that my Dynaudios 4 ohm rating was a conservative rating and that they will work with most amps).
What are your 4 ohm speakers? If we knew, it would help us give better advice.
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