Originally Posted by DavidVTHokie
I don't know that I even understand the marketing - is the 6006 the replacement for the 7005? Is there to be a 7006?
the first digit is the "level" of receiver. the last digit (or last two?) is the "model". So in other words, SR5004 is the previous model on par with its newer brother the SR5005, and both are on par with their even newer brother the SR5006. The SR7005 is two steps "higher" than the SR5005, and both were released in the same year. The last two digits is not the actual year of release however, more of a "version number."
So the SR7005 is a model year "older" but also a "higher grade" receiver than the SR6006. The difficulty comes in that the SR6006 seems to now have many of the features that previously distinguished the SR7005 from the SR6005. And for those of us with "8" or "9" grade receivers (I have an SR8001), the SR6006 features are quite aluring but it is quite unclear what is being compromised in dropping from an 8xxx series to a 6xxx series.
It's been even LONGER since Marantz released a 9xxx series AVR. Whether because of too few customers, or because that 'level' of technology is just not that expensive anymore, I don't know. With all the Sr7005 features making their way into the SR6006 space, it makes me wonder if Marantz is having trouble justifying the 8xxx/9xxx series AVR's (and their higher pricepoints) or if it's for some other reason.
As a reference the 8100, 8200, 7100, etc receviers are the old numbering format. Anything with a "0" as the right-most digit is older than a non-zero right-most digit. So in the 8xxx range, they were released as follows: SR8000, SR8200, SR8300, SR8400, SR8500, SR8001, SR8002.
Also note that with these two number schemes at least, anything xxx1 or later includes HDMI. xxx0 does not. (SR8001 has HDMI, SR8500 does not)
hope that helps,