I have the 6006, since 2017 and it is a good amp in its category. The 6007 will be better. It has better S/N figures, which is a weakness in the 6006 and support for a sub-woofer, if that is important to you. They also replaced the loudness button with a filter button, not that I think the filters make much difference.
So the answer, is yes, it is a better amp. How much you'd notice, I am not sure and whether it is 350 Euros better, only you can decide. You will get warranty with the new 6007.
I don't know anything about the Denon but it did get good reviews, back in the day. Denon and Marantz come from the same stable but generally a similarly priced amp will perform better than an AVR, because the AVR has many extra components to include in the price. It depends really one whether music or TV is more important to you.
Rather than a Bluetooth device, I'd look at one of the Wiim devices, particularly the Pro or Pro Plus. They have Bluetooth, transmitter and receiver and Chromecast, Airplay and support for most streaming services. I'm running a Wiim Pro through the 6006 Co-axial and recommend it. You'd still have 2 optical ports to connect TV etc to.
I have a Wiim Mini connected to another system and it is OK, as long as you don't need Chromecast.
Music will be more important than TV for me. I will only have a 2 x 2 speakers system, plus, eventually, a sub-woofer at some point. I chose the Polk ES20 also because thy seem to have very good bass, hoping that a sub will not be necessary.
Even if the music will be more important than TV, I still need to drive a dvd reader, a google chromecast end a console. That would be 3 hdmi's. Also I would need t a bluetooth. So, practically an AVR would be better.
The alternative to an AVR would be :
- buy a 3-way hdmi switch ;
- buy an hdmi audio extractor with optical/coaxial output ;
- buy a bluetooth device (receiver only is enough).
What I can't understand is if the audio quality gain with, say, a marantz pm6007 instead of a similar price AVR is worth adding all this stuff to the system.
Otherwise, does it exist some kind audio/video commutator capable of doing all this ?
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