Originally Posted by bbexperience
Honestly, this shouldn't be that complicated. I use the Ax720 amp with a Little Dot 1+ amp and it works fine. Connecting the Ax720 amp to the receiver is really the same principle. Just get the 3.5mm to dual RCA Y-adapter and run it from the Ax720 dongle to an input on the receiver. You'll still be able to use chat if you ever want it: just connect a 3.5mm to 2.5mm cable from the other 3.5mm output on the Ax720 dongle to the controller. If you're never going to use chat, then you won't need that cable.
I just finished trying all of this, bought the required cable this afternoon:
3.5mm into AX720 headphone jack, 2xRCA into the back of the reciver L+R DVD IN.
Then headphones directly into reciever headphone jack.
At first it was quite difficult to decide if it was working or not. Receiver decodes almost all the very latest codes. For the DVD input, all that I could switch was between DIRECT and STEREO. As far as I could tell (there's a bit of a delay between the switch so you can't really hotswap the sound in real time), there was no difference. Overall again at first, it seemed to sound "right" (DD 5.1). Switching off all the AX720 amp's settings there was a noticeable difference. Switching back one to headphone DD, and setting the receiver DVD to STEREO and flipping through the recievers own simulation (run of the mill: jazz, club, mono, all channel stereo, matrix etc. etc), those all could be heard when in STEREO. Switching to DIRECT. None of them worked.
1. DIRECT mode displays just ANALOG on the receiver display.
2. DIRECT mode from the TV ( HD + DD cable box) displays DIGITAL DOLBY STEREO
This is all when the headphones in the receiver of course.
I'm not sure what that means, if the AX720 is also a DD source why is the receiver interpreting it as ANALOG when direct?
As I say it seems to work at time of listening, sounds good but not quite sure if it is.....
until plugging everything back into the AX720 directly
Night and day. No comparison whatsoever after that, crystal clear that that is pure 5.1 DOLBY HEADPHONE
surround coming out of the AX720 into the headphones.
So I am thinking unless I try other inputs on the reciever, that unless Dolby Headphone is built into the receiver, it simply won't work. Or at least it's close enough that if you never heard it before or from a decoder amp like AX720 or other, you'd think it was fine. Very very close but no cigar.
edit: I'm now at the stage where I may have to get an amp, watched a lot of 5.1 movies and some definitely needed a lot more power to make watching them worth while (action vs drama), most you can get away with but a few I found myself muttering damn thing needs to be louder!