Ho do I set up atmos on Onkyo

I believe that Dolby Atmos would require a hardware change. Atmos has at least two extra channels. This would mean extra amps installed.

Make certain that any Blu-Ray player connected is putting out the right signals. Sometimes they can have the option to "mix" signals for certain TV's. This however will kill the signals needed for Atmos.

Pressing the info (several times) on the remote will show what mode it is in.
The sound mode for movies is selected by pressing the movie button on the remote.

Have you updated the onkyo firmware as Dolby atmos operation requires it
I use input one on my amp for the Sony
video out hdmi port on Sony to hdmi input one on amp the other hdmi port on the Sony is audio only for non 4k receivers /amps

The other part of the equation is your source; which is not mentioned in your question.
Your player must also be able to decode Dolby TrueHD and the audio output on it set to Bitstream.

onkyo receiver

I have the 405 and a Samsung 3600 which has onboard DTS Master/ Dolby True HD. Out of the 6 movies I 've watched, only 2 have given me Dolby Digital. Bottom line: If the movie doesn't have DD, you cant get DD on the 405. I thought just about all blu rays had DD but its not so. Its time for us to upgrade!

Dolby Digital includes several similar technologies, which include Dolby Digital, Dolby Digital EX, Dolby Digital Live, Dolby Digital Surround EX, Dolby Digital Plus, and Dolby TrueHD.

Dolby Digital, or AC-3, is the common version containing up to six discrete channels of sound. The most elaborate mode in common usage involves five channels for normal-range speakers (20 Hz – 20,000 Hz) (right front, center, left front, right rear and left rear) and one channel (20 Hz – 120 Hz allotted audio) for the subwoofer driven low-frequency effects. Mono and stereo modes are also supported. AC-3 supports audio sample-rates up to 48 kHz. Batman Returns was the first film to use Dolby Digital technology when it premiered in theaters in Summer 1992. The Laserdisc version of Clear and Present Danger featured the first Home theater Dolby Digital mix in 1995.

This codec has several aliases, which are different names for the same codec:

* Dolby Digital (promotional name, not accepted by the ATSC)
* DD (an abbreviation of above, often combined with channel count: DD 5.1)
* Dolby Surround AC-3 Digital (second promotional name, as seen on early film releases and on home audio equipment until about 1995/1996)
* Dolby Stereo Digital (first promotional name, as seen on early releases, also seen on True Lies LaserDisc)
* Dolby SR-Digital (when the recording incorporates a Dolby SR-format recording for compatibility)
* SR-D (an abbreviation of above)
* Audio Coding 3 (relates to the bitstream format of Dolby Digital)
* AC-3 (an abbreviation of above)
* Audio Codec 3, Advanced Codec 3, Acoustic Coder 3 (These are backronyms. However, Adaptive Transform Acoustic Coding 3, or ATRAC3, is a separate format developed by Sony)
* ATSC A/52 (name of the standard, current version is A/52 Rev. B)

DTS-HDMA and Dolby TrueHD cannot be passed to your receiver via bitstream on the PS3. DTS-HDMA cannot be decoded either so you're out of luck there.
Dolby TrueHD can be decoded internally on the PS3 assuming your firmware is up to date. Set the Blu-ray HDMI output to PCM and you can then pass it to your receiver.
If this doesnt work, do a system update on your PS3.

In the menu is an option for switching master and true hd on. Standard its of and played als normal dts/dolby.

also: check the input (blu ray?): maybe it is set to only output no high def signals, so the amlifier doest recieve hd sound..

Igor