Well, your speakers have an interesting design, and I'm not surprised that they sound great! Most of the power demands are in the bass, where I think you have a built-in amplifier in the DT BP7000s -- do you? I assume it is sufficient. I'm curious about the crossover point to the built in sub, and the slope. Also, how big is your room, how close do you sit, and how loud do you like it?
As you may know, AVR specs are not held to as high a standard as separates, in most cases. So, your AVR amps are rated at 125 watts per channel into 8 Ohms with just two channels operating
. With all channels operating at the same time, you will get less power for each channel.
A rule of the thumb used to be approx. 80%, but I don't know if that is still true, or is true with Denon. 80% would be 100 watts, so, in reality, if rated the same way separates are, you may have 100 watts per channel. On the one hand, a reduction of 20 % almost certainly won't make an audible difference. On the other hand, if the Monolith is rated at 200 w.p.c. with all channels operating
[and the Monoprice ad says it is] that would be 3 dB more than the probable 100 watts of the Denon. Hopefully the Denon has pre-outs? While the powered sub in the DTs does the heavy lifting, some of the bass impact (the "smack" of a beater) can be as high as 100 to even 200 Hz, above the typical sub crossover. IMO, you should be able to reach the 105 dB full scale of Reference level for movies, for your "above sub" frequencies with either the Denon or the Monolith, with a 92 dB (moderately
high) sensitive speaker. The sub needs to put out 115 dB, so I hope DT has allowed for that. If you are rolling in money, I'd get the Monolith (or equivalent) for the probable extra 3 dB, just for the psychological benefit.
Before you run Audyssey, see the Audyssey FAQ "Audyssey FAQ Linked Here"
in this AVS Forum's Official Audyssey Thread, Part II, and raise any questions there. It is a great help. I love what Audyssey does, but most people turn up their sub a bit after
Audyssey calibration. This is to conform to the average preference curve that Harman and others have found.
Best of luck!