Originally Posted by RaceCarDriver
While the AV8805 has more channels, the benefit is not the more channels but other quality features it has over the 7705. I get price is a factor.
Even if you don’t utilize all 13.2 channels the 8805 being made in Sound United’s reference Shirakawa factory in Japan is the beginning of the story. This factory is reserved for the AV8805, Reference 2 channel gear (PM10, SA10 etc) Denon 8500 and the new Classé gear.
The 7705 is built in Vietnam.
The 8805 starts with a Toroidal power supply, this feeds 4 large capacitors. 2 of those are dedicated to the 15 HDAM modules, 1 per channel. The other 2 caps are for the rest of the unit.
The 7705 has a single PCB for all the channels instead of an individual PCBs per channel like on the 8805.
The 8805 also has 8 stereo DACs, 1 DAC for every 2 channels, instead of a single multi channel DAC like on the 7705.
The 8805 DAC is optimized for the front L&R channel, and then copied for all other channels in pairs with the additional DACs.
The 8805 has a dual core processor.
Among other features such as the copper plated 3 piece chassis, there are several reasons the 30 pound 8805 is 2x the price of the 23 pound 7704/7705.
8805. See the 15 circuit boards behind the display. Those are the 15 HDAM modules. 1 per channel.
7705. Notice the empty space? The extra 8 lbs in the 8805 didn’t come from no where.
And in addition to all
of this, the 8805 has a multi-level “Dialogue Enhancement” feature where the lower models utilize a (similarly named) feature that is just a simple center channel boost. They’re not the same thing.
If HDMI 2.1 is brought into consideration (which for some, it will, and others, it won’t), then you’d have to replace the 7705 to gain the HDMI 2.1 features. With the 8805, this upgrade will cost a couple hundred dollars and, yes, have to go back to a service center to complete.
I don’t know if I’ll ever need HDMI 2.1, but I never rule anything out. I debated this idea myself, then this thought came to mind... I could buy two 770x processors for the same price as the 8805, but they still
won’t be the equal of the “flagship” model.
In the end, I’m happy that I made the decision to go for the 8805. To my ears, and in my system, the 8805 does sound fuller, more detailed, and all around better than the 7703 it replaced.
If price is a consideration, the 8805 can be purchased well below MSRP from legitimate “authorized” dealers. For one of them, you don’t have to go outside of this forum to get a great price.