I upgraded to an NAD T762 from a reliable R7100/2100 system with a Yamaha DSP-E300. As you well know, I waited about 6 months for arrival.
I hooked the unit up and after turning the unit on (with no input) I turned up the volume (+3 db) to hear how quiet it was - it wasn't. It was noisier than my 10+ yr old 7100.
I then played a couple of DVD movies. The movies sounded great, except for the fact that during the quieter passages, there was an audible whine from the center and rear speakers (DSP?). Also, my Sony DVD player and the NAD did not play well together. After FF, REW, pause or when switching certain scenes, the digital signal lost sync (resulting in no sound). I would have to switch to another input and then switch back to DVD on the NAD to regain the sound. This did not happen with the dealer's T562 hooked up to my T762, but on the other hand, my Sony DVD had no problem providing a digital stream to a T761 the dealer let me use for a week in Aug. 2002 when I originally started looking to upgrade.
I listened to a couple of CD's to see how that would work. Any DSP mode I used had noise. I returned the unit to the dealer, demonstrated the noise, and he promptly gave me their last new one in exchange.
After hooking it up, the noise level was less, but still not what I expected for $1300. I modified the T762 settings at the request of the dealer to set all my speakers to "small" (Thiel CS1.5 fronts, Monitor 8i center, Definitive 1.2x surrounds, M&K Volkswoofer). By doing this all bass was sent to my subwoofer and a noticeable hum was the result when the output was raised to theater listening levels with no input (+3 db).
One other thing I noticed was that when I played a CD via digital input, the beginning of the song was cut off. This did not happen when I used the line inputs instead of digital. I could only conclude that the digital did not sync quick enough or that the T762 muting circuitry didn't release quick enough and thus a chopped off beginning. Also, when playing a CD, the resulting sound was not as good as when I used the line outputs from either the DVD player or my Rotel CD. My dealer explained to me that the D/A's in the players were better than the T762 and that they usually use line inputs for their systems. Anybody have any comments on that?
My listening levels for line inputs were in the negative teens (-1x db) and positive single digits (+x db) in digital for movies.
The whine was still there when playing DVD's on the second T762.
I also thought that I might have an external noise problem, so I shut off all circuits in the house except for one dedicated outlet and ran from that. There was no difference in the noise levels. Nothing changed.
I took one of the DVD's that had silent passages (Harry Potter) to my dealer to try it out on his demo T762. Their T762 exhibited the same behavior, so we tried an experiment. We played the same passage through a Krell processor/amp and there was no whine. We took the pre-amp output of the T762 into a Krell amp - the whine was back. We took a Cambridge Audio DVD player's 5.1 Dolby decoded output into the T762's 7.1 input - no whine. Unless I missed something, it looks like the DSP in the T762 is the problem. The dealer didn't have any other T7xx equipment to test with.
I have emailed Lenbrook (NAD) on 2/12/2002 and even called them later to see if the email was received. I was told that the email will be forwarded to the proper person. I have still not got an answer. My dealer talked to his rep. on Friday, but I haven't heard any word yet.
My past experience with my 7100/2100 has been great. I never had any problems with them.
Does anyone have any similar experiences with their T76x equipment or have any constructive comments/suggestions?
I sure hope Lenbrook (NAD) gets their act together and gets back to me. I hope that the third one I get is worth the $1300 I paid for it. I can get this current kind of DSP performance from a $500 circuit city audio system.
If/when NAD fixes my problem I will post a hopefully, "more glowing", update.
Sorry for the long winded post.