A verdict has been reached!!!
First off, hope everyone had a good holiday!
It came down to the following that made me just place my order at Amazon for the TX-SR707.
1) Connectivity:
6 HDMI, 10.2 support, Speaker terminals of higher quality with superior layout (easy/smooth to turn, space between cables is great)
2) Signal pass-through (upconvert/upscaling)…
The 21txh will not pass 1080p out to the TV via HDMI other than from HDMI inputs.
My Nintendo Wii hooked up with the standard composite cable looks substantially worse going through the 21txh! I mean worse than just straight to my TV, and horribly worse than through the 707.
The 707 will output 1080p via HDMI Out with every single input, and does it very well.
3) Remote:
The 21txh remote requires you to hit the receiver button on a regular basis, sometimes I swear I haven’t changed the setting or to another input and I still have to hit receiver before it works again.
I find the 707 remote more comfortable in my large hands, and the input selectors all light up!
4) GUI:
The 707 has an onscreen GUI that allows for adjustment of common settings (sub,center,bass,treb,etc) without interruption of playback… any such adjustments require you enter the MCACC control panel and it completely stops video/audio output. Additionally even when you get into the MCACC you can only adjust the preset (#1-6) that you had active when you entered the MCACC!
It is also worth mentioning on that note that the 707 has only one setup for audio output, meaning the settings carry across all inputs… while the 21txh allows you 6 preset audio profiles that can be changed at any time from the remote, and when you change input the AVR remembers which one you used last. This presents one of the more interesting debates I had between these two in my head… and while the 707 only has the one preset, you do get onscreen access to (most) these settings at anytime with a dedicated button on the remote.
5) Sound:
DISCLAIMER: I am a nub, I have not serious expertise in this subject other than being an amateur musician and music lover. I know what sounds good, but I couldn’t tell you how it gets to sound that way if you follow…
I love the MCACC, and I feel it does a better job of calculating the characteristics of my living room. However no matter how much tuning I did (and I’m certainly no pro here…) I could not get the same full sounding range out of my modest Polk Monitor speakers as I had out of the box with the 707. Specifically with low-end & bass frequencies.
I used a few 360 games to test this as I am primarily a gamer. Need for Speed Shift Demo and CoD MW2. I loaded up several kits in MW2 and opened a private match using the same setup each time I performed these tests. The .50 Barrett sniper rifle, all types of grenades, firing a javelin close/far, silenced weapons, automatic weapons, burst fire, shotguns, even the sound of a melee knife swing…
Need for Speed Shift was easy… there is only one race in the demo, and I used the same car each time. I listened carefully to the intro video which has some seriously loud and down low bass hits. During the race I would purposefully drive up on the rumble strips on the sides of the course in certain areas. Then after each race there was another promo video with some different footage and more cars racing/smashing/etc
I could never get my sub (PSW505) to sound as loud and low with the 21txh… I adjusted the subwoofer output level from -8.0 to as high as +6.0 and it would go from not loud enough to actually sounding like it could damage my sub if I hadn’t had it at such a low volume. The 707 has couch rumbling lows without any sound of “stress” on my sub.
I will also say that I think the Audyssey does a great job, its just not as finite as the MCACC and doesn’t give you granular control over every last setting. I love that I can setup my speakers size, crossover, etc and then still run the MCACC using those settings.
Overall I actually think the 21txh has a cleaner sound that really brought a bit more life out of my speakers, but the range just wasn’t doing it for me.
6) 7.1 and up to 10.1 Testing…
I am using a terrible pair of Sony micro-satellites from my old HTIB to test out my Front High, Wide, Rear Surround abilities with these receivers. Well I guess only the 707 on the Front Height/Wide setup as that is not available on the 21txh.
Hands down winner here… I couldn’t get the 21txh to output sound to my rear surrounds (7.1) no matter what mode I selected when playing 5.1 content. I double, triple checked to make sure they were activated in the MCACC, and I had them all hooked up before I ran the calibration so I know they were working.
The 707 has several audio modes that allow sound to be pushed to the rears, mainly the one I like the most was on the 360 which supports Dolby Digital 5.1 it has a mode called Dolby Digital EX and that gave me 7.1 with rear surround in all my 360 games… nice! I know its not really 7.1, but it sure adds to enveloping me in the sound. The cockpit view of a race car? Real nice there.
I also think the ProLogic height setup is pretty weak, as it introduces a whole bunch of processing (again terrible speakers, noob writing this review) which I didn’t care for mainly by boosting subwoofer output etc.
7) Crossovers…
The 21txh forces you to set all speakers to 50Hz, 80Hz, 100Hz, 120Hz, 150Hz, etc and nothing in-between… does this really matter though?
The 707 allows 40Hz and up in 10Hz increments for all speakers, and even allows you to set the LFE crossover to 80Hz, 100Hz, 120Hz which I haven’t seen in other receivers and I think is a great feature. Maybe for now I’ll be rocking THX 80Hz across the board, but what if I drop some real coin on some full range speakers in the future?
8) Miscellaneous…
The 707 clicks every time I change a track/scene while playing a blu-ray, and the 21txh did not do this.
I really like the Pure Audio mode on the 707 for listening to that John Mayer blu-ray concert, and I’m not sure if the Pio’s “Pure Direct” mode is the same?
The Pio has a PC style removable AC line cord… that is awesome.
I scored the 707 for $499… $100 less than the 21txh.
The Pio is sexier overall from the front, but the 707 has the better backside (which is important to me in other aspects of life as well

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I think that about raps it up… if anyone has questions I’m available otherwise I think that about does it.