The NAD T775/T785 AVRs w/ HDMI 1.3 Thread! - Page 98

The Jitter issue with HDMI is still going to be a sound quality concern even at shorter lengths.I recall reading where Jitter is addressed in HDMI 1.4. So until that happens it would behoove you to try the optical when playing your lossless stuff. Listen to some of your favorite stuff with optical and see if you notice any improvement.

Thanks again. I will give it a go this weekend. I think AppleTV can output HDMI and Optical audio simultaneously so I can set up two inputs and do an A/B comparison just by pressing a button during playback.

Cheers,
Jason.

Intermittent audio dropouts when playing DTS or Dolby Digital is a known problem at NAD. It can be described as the reciever mutes for a second during playback of mentioned sources.

They actually have a hardware bulletin which fixes this exact issue.

Solution is for a NAD technician to remove the DSP board(audio board) and modify a couple resistors from 120 to 27 OHMS. This will impove the clock signal on the board. Firmware upgrade 1.18 along with these hardware modifications solves the problem.

This would also explain why so many people experience the problem solved, when upgrading to the AM200+VM200 boards via the MDC programme. The DSP board is replaced with the newer board(AM200), which does not have this resistor problem.

I hope this clears things up a bit.

/James

I got these audio drop-outs after I upgraded to AM200/VM200 on my T785HD.
Firstly NAD needed to make some adjustments to HDMI on my T785HD to have my Denon 3930 connect properly over HDMI.
I also had drop-outs from my Oppo BDP-83 primarilly when running dts hd-MA bitstreamed to the T785HD. Then the connection light on the T785HD started to blink.
After I upgraded to Oppo BDP83SE these audio dropouts have more or less vanished/disappeared.
But I get drop-outs sporadically from my TV decoder and when I play CD's, DVD-Audio or SACD.
I am currently running firmware 1.24.

Soundwise the T785HD is fantastic. But, I don't understand why NAD can't sort out the problems. I have had this going on since the upgrade in October 2009.

To me that sounds like a faulty DSP board(AM200).

Are you playing CD's from a HDMI source?

Oh and BTW, the audio-drop outs started for me when I upgraded to the newest firmware 1.24. This, for me, clearly indicates that my reciever does not have the required hardware modification I mentioned above. I had NO audio-drop outs with my old 1.16 firmware.

I play CD's through Analog both from my 3930 and BDP-83SE.
They are both set to Analog Bypass in the T785HD.

If I do the setup as you suggest, the signal still travels through the chip and doesn't add or subtract anything, yes. But that is NOT a true HDMI-passthrough!
Really bad of NAD that they could not implement this function via software to existing modules. Surely it can not be any technical difficulties or expensive process to perform?

Finally!! A review, and very favourable nonetheless, of our faithful NAD T-775.

It just came out on AVGuide.

http://www.avguide.com/review/nad-t-...eceiver-tpv-88

Have a read.

Cheers,
Jason.

I have a 765 with both AM & VM 200 card upgrades. Still having problems after firmware updates and PS3 with latest update. Problems with LPCM but mostly inaudible bitstream. Emailed Bob Moran and he is calling me back tomorrow. Will let you all know what I find out.

One of our clients had an audio problem when playing a DVD on his T785hd.The player was a Sony Bluray 360. When the menu came up,Screeching audio occurred. I would guess it wasnt decoding Dolby Digital. I tried the same disc later and it seemed fine. The front display shows Dolby Digital for both the menu audio and movie audio.
Anyone have any similar problems or have any insight. He indicates he has heard the same effect on other discs.
Thanks

I'm getting ready to pull the trigger on a t785. What's the general consensus on the various boards and their compatibility? I've seen a number of complaints here about popping and other audio problems. Which boards seem to work well and which don't? I would like the AVR to handle all sources. I have cable (Scientific Atlanta 8300HD now but that will probably change as Cox upgrades their system) and a PS3 40GB that I use for both BluRay/DVD playback and as a Media player through my computer. I will be using the AVR for both stereo music and home theater surround.

I also plan to move my computer into the living room to use for playing stored and online media. It has an EVGA GT240 card that has an HDMI output.

My appologies for crashing the 775/785 thread but could not find anywhere more approporiate for this issue.

I grabbed the 765 HD the other night and have not had much success getting Component Video to work on my SA 8300 HD PVR (Optical Audio). The video signal is constantly being dropped (resulting in a black screen for several seconds) and on occassion completely lost until I cycle the AV input and then back to the PVR. I am unable to use HDMI out from the PVR as I am constantly pulling the AV stream through my Singbox Pro HD. I have tried several other devices with Component Out, does not appear to happen as frequently but some video drops.

Anyone aware of signal drops with this unit? Any quick resolution? With a unit less then 72 hours old, I dont want to have to bring it in for upgrade / repair already.

According to the receiver: System Info MCU v 1.20

Thanks in advance!

Mark

Hi,

I also have a brand new T775HD. This replaced the previous one I had for only 24 hours.

I also had the Component issues with video dropping out repeatedly (seemed to especially occur on camera change during the tv shows.

The only reason i was using Component was it would talk to my PVR at all over HDMI (Topfield TRF 2400)

Mine says MCU v1.24 DSP v1.04b, Video v1.01 UART v1.04

very frustrating. almost planning to return and buy a Denon. My current $600 denon has none of these issues (but sounds nowhere near as good as my old T752)

Thanks for the reply Kabong, glad I am not alone as the AV Store is looking at me like I am nutts.

With the second unit, did it solve the issue (ie faulty component in the first 775) or are the dropped signals persistent in the replacement (design fault)? Atleast that will give me some direction on how to proceed.

Spent nearly two hours on the phone with Bob Moran this morning. For starters; those that have installed the latest up date should do a system reset. THe installer made it convenient to not have to replace all your settings but that was the first thing we did.

Ultimately what was discovered was an earlier PS3 bandwidth output problem. Bob said his cousin works at Panasonic tech support and they are finding many earlier Sony products that were firmware upgraded just don't output the new codecs in Progressive very effectively.

The trick was leave audi output in bitstream (HDMI) but change video out from 1080p to 1080i (1/4 the bandwidth) and let the 765 do the upscaling.

NOTE: To those that are not getting problems readily resolved by dealers
should email Bob at: blmoran@lenbrook.com

Does that apply to 1080p sources, ie. PS3 Blu-Ray?

Sorry I wasn't too clear there. The older, not the new thin, PS3 would output the 1080p Blu-ray video just fine but LPCM would have periodic drop outs while the bitstream was much more frequent and even sometimes a constant cycle about 4 times a second. When we changed the PS3 to 1080i output and upscaled in the 765 all problems cleared. I don't believe you could make a case for all 1080p sources but I don't have any way of checking. I am not using one of those $300 HDMI cables, but a midrange 1.3 3' cable from monoprice. I don't recall all the configurations I tried but seams even optical audio out on the PS3 was experiencing drop outs.

Hope that better states the issue.

have anyone got in touch with the new Ethernet and usb module?

Interesting. I checked out a t785HD at a dealer's yesterday and he didn't mention ethernet capability. In fact, he asked me if I needed or wanted network capability, stating I would be better off looking at a Yamaha or Denon if that was a high priority. He also stated that firmware programming was via an RS232 port. I would assume that the USB port could be used for that on units that have them.

He also told me that the HD model is the only one they are producing now, with the AM200 and VM200 modules.

edit: I emailed the store and the response was that NAD no longer uses the CM-200 module.

This module was for Control4 integration and NAD is still listed as a partner on Control4's website - http://www.control4.com/partners/par...partners-list/

Contact NAD directly for the status of this module.

As an update from 04-21-10, 10:08 PM.

Heard back from NAD regarding my dropped video signals on my 765. They have defined the problem as "Jitter" and the recommended solution is to have the VM100 upgraded to a new model.

Though would keep everyone in the loop.

Mark

I received this information from my local NAD dealer:

"In some NAD T7xxx the receiver cut the blackest shades in the picture, which not should been seen in the movie and that is not a function I can disconnect. There is nothing wrong when it comes to that, but when you calibrate, you see the shade and then put the image so that the shade is not discernible in the picture. There may be a small question mark why this shade is visible if you connect the player directly to the TV and see the shade while you can't see it through the receiver, but it is so it is built."

I wonder, is T785HD build in the same way??

NAD does not pass below black and above white on purpose. Do a search of my previous posts for a better explanation. Basically NAD sets up the receivers to pass what is suppose to be visible - 16-235 in an 8-bit system. There shouldn't be anything outside of this range.

i have the t775 with the am 200 and vm 100.input 576i and it outputs at 576i over hdmi. is there a setting im missing. i have a 1080p panasonic plasma.

The T775 with the VM100 card doesn't scale, it is just a HDMI repeater and cross converter to analog video signals. It is only able to deinterlace 480i/576i signals to 480p/576p. You need the VM200 card to do scaling and deinterlacing up to 1080p.

sorry i was a unclear, Mungam. My vm 100 does not de-interlace 567i.input is 576i and the output is 576i not 576p. is there a setting im missing or does this happen automatically. i have 1080p tv so it is progressive compatible.

I have the VM200 card, so I don't know if it is in the same menu: In the Setup Menu -> Video Setup I can select the output resolution (interlaced or progressive).

Hello all:

first, I am sooo glad I found this thread, I really thought it was just me!


I bought a T765HD last July. I had issues like hollow sound, no mid-range or bass power. There were issues with the digital handshake, pressing "next" and the track would start a few seconds into the data. Anyway, it went back to Ontario NAD replaced the 100 boards.

Got the NAD 765 back, the sales rep from my retailer came and set it up, so they know it was working, the digital handshake issue is happening again. Is there a problem with NAD equipment or do I just happen to have a lemon?

Did a lot of A/B testing, got a great sound, but the digital handshake issue is still there. Anyone know if there is a fix for this? NAD give no indication of an answer...

Storywizard

Just to give some update about my situation with the audio drop-outs.
I have made a change in the setup of my Loewe TV. I needed to go into a special service menu (into some very bits and bytes menu only for service people from Loewe).

I set Image+ to OFF. After I did this I have had no audio drop-outs. I believe that because I have scaling in the VM200 card there have been some HDMI negotiating between the T785HD and the TV. This has then affected the HDMI chain all the way from either the Denon 3930, Oppo BDP-83SE or the TV decoder.
My assumption is that this picture improvment mode, Image+, in the Loewe TV when set to ON (and this is the default) made the problems I have experienced.

At least it solved my problem. But, I had to find out this on my own. Nobody has been able to tell me.

The T785HD is just so good. Now I am a really happy owner with a fantastic sound coming from any source