I know those speakers, a friend has them. He paid around $900 for the system from a local HiFi shop, it was a good price so he says.
I set him up with everything else. A Denon AVR 380x and a DVD-2900, for a Panasonic Tau 36” HDTV CRT over a year ago.
The speakers are disappointing, not particularly musical but good for Movies and TV and are tiny and easy to place and hang. Sub sucks!
I’ve had a few Denon AV receivers and I know a number with them too, they are sort of sterile and lack luster. Nothing particularly good about them, but noting particularly bad either. They definitely lack body and that nice robust mids and bass. Something the Definitive speakers desperately need so I’d say the Denon would be a poor match.
I got rid of my last Denon AVR 280x something that I really didn’t’ like. I had a few speakers to choose from for HT. I used it with a nice pair of early 80’s Energy Pro 22’s. I also had an NHT sub/sat system and some KRK RoKits. I replaced with a Pioneer VSX-D811S receiver. It has more body, more bass and a softer sound that is more musical. I also have a Kyocera 2-channel receiver from the early 80’s that puts them to shame. I also have an early 70’s Sansui 2-channel Integrated that also puts them to shame but anyhow.
I’d say the Arcam Receivers are of the best for the money and buying one a couple of years old is wise. You can get the units for a lot cheaper then new. Audio gear are likes cars, as soon as you open the box or pull out of the lot the value depreciates tremendously.
Either way, I’d look for a richer, bass heavier amp to make those speakers sound half way decent for music.
Just my 2 cents.