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NAD M51 Direct Digital DAC Impressions - Page 72

post #1066 of 1540
the only way to know is to try. dam I have to buy some cables again.
post #1067 of 1540

Re firmware, fear not, NAD customer service have their best minds  :blink: on the job. Their response (below) may be too technical for some so here's the google translation:

"No, dunno, next case."

 

re: NAD M51 firmware
Adding to my unanswered question above; I just found out that other new owners have v1.43 FW installed on their units. Why is NAD not making each new FW and a list of changes available on the web?
Please find copies of both 1.42 and 1.43 for me.
Thanks
Pam
2014-02-27 08:09
re: re: NAD M51 firmware
Hi John,

We only posted the last released software on the NAD Electronics website for updating.

The V1.42 and V1.43 could be production only software releases and have slight software changes not applicable to the general features of the unit.

We will pass along your suggestion to add a list of fixes with each software releases to the NAD engineering team for future consideration.

Thank you.

Regards,

Pam
(mw)
post #1068 of 1540

How can I check what firmware I have? It doesn't seem to be within the setup menu.

post #1069 of 1540
Quote:
Originally Posted by herbiehancock00 View Post
 

How can I check what firmware I have? It doesn't seem to be within the setup menu.

It's kinda explained in the manual. I'll try from memory; no guarantees:

Turn unit off via front button.

Reach behind unit to main power switch, turn that off.

Wait for a seemingly long time until the red light on the front goes out.

While holding your finger on the front panel "input" button, turn back on the main power switch on back of unit.

Release input button and watch display. A v1.xx number should appear. That's it.

Do nothing for several seconds (or you might trigger a reset).

Seemed I eventually had to press the front panel power button again to get back to normal.

 

BTW; days after I checked FW the first time, I noticed that my display was showing "unlocked" while music was playing instead of showing me the sample rate; e.g. 192/24.  I could not work out why or what I'm supposed to do do change the display...anyone know?

 

Anyway, I went through the above procedure for a 2nd time and the display returned to normal.

post #1070 of 1540

I just received a new M51 today, and it came with 1.43 as well. 

 

After reading all of these pages I had thought I might flash to 1.39 just to see the difference but I gather that is out of the question now.

 

One thing I find is that the procedure for doing a factory reset doesn't seem to work. When I do what is described in the manual the display just lights up and the dac does not shut down automatically like they say. Anyone else with 1.43 able to do a reset?

 

Something else that may be worth mentioning is that their USB driver is just the rebadged XMOS driver, and it seems to be a couple versions behind.

post #1071 of 1540
Quote:
Originally Posted by Sanlitun View Post
 

I just received a new M51 today, and it came with 1.43 as well. 

 

After reading all of these pages I had thought I might flash to 1.39 just to see the difference but I gather that is out of the question now.

 

One thing I find is that the procedure for doing a factory reset doesn't seem to work. When I do what is described in the manual the display just lights up and the dac does not shut down automatically like they say. Anyone else with 1.43 able to do a reset?

 

Something else that may be worth mentioning is that their USB driver is just the rebadged XMOS driver, and it seems to be a couple versions behind.

I phoned my local NAD service agent, who said I could revert to 1.39 and if not happy, take my unit to him for reloading 1.42/1.43.  He seemed to think NAD will promptly send him the latest FW (via secure server) but will not allow him to give me a copy.

post #1072 of 1540
Quote:
Originally Posted by JDOz View Post
 

It's kinda explained in the manual. I'll try from memory; no guarantees:

Turn unit off via front button.

Reach behind unit to main power switch, turn that off.

Wait for a seemingly long time until the red light on the front goes out.

While holding your finger on the front panel "input" button, turn back on the main power switch on back of unit.

Release input button and watch display. A v1.xx number should appear. That's it.

Do nothing for several seconds (or you might trigger a reset).

Seemed I eventually had to press the front panel power button again to get back to normal.

 

BTW; days after I checked FW the first time, I noticed that my display was showing "unlocked" while music was playing instead of showing me the sample rate; e.g. 192/24.  I could not work out why or what I'm supposed to do do change the display...anyone know?

 

Anyway, I went through the above procedure for a 2nd time and the display returned to normal.

Just did the verification of my firmware with your instruction and everything went fine and it worked.

 

The only thing that puzzled me is my version is 1.35??? I checked it twice. I can't find anything about that version on the web.

 

I will try to contact a NAD dealer to upgrade to 1.39. My unit was bought from a pawn shop! But still, it's sounding fantastic.

post #1073 of 1540
Quote:
Originally Posted by Lappy27 View Post
 

Just did the verification of my firmware with your instruction and everything went fine and it worked.

 

The only thing that puzzled me is my version is 1.35??? I checked it twice. I can't find anything about that version on the web.

 

I will try to contact a NAD dealer to upgrade to 1.39. My unit was bought from a pawn shop! But still, it's sounding fantastic.

You'll be able to download a copy of 1.39 and install it yourself if you're willing and able. Search the web or M51 forums like this or try (I just searched myself)...

http://www.fileswap.com/dl/BlRT7tfhYl/

 

I have NOT yet installed it myself so no guarantees.

post #1074 of 1540

Im just reporting back on some findings in my system

the first i tried is computer playing flac files using jriver -- usb cable /or hdmi -- nad m51 -- decware csp2+ as preamp -- alo studio six -- silver poison -- lcdX

using usb  is better than hdmi in this configuration ( i was using a wireworld 7 starlight  and a $80 hdmi  cable)

 

the next configuration i used 

playing flac files thru oppo 105 -- hdmi / coax cable -- nad m51--decware csp2+ as preamp -- alo studio six --silver poison --lcdx

the hdmi and coax sounds identical ( using acoustic zen mc2 coax rca and $80 hdmi cable)

 

now comparing using flac files thru computer /jriver vs flac file using oppo 105 -- using the oppo 105 is much much better 

 

and the nad is way way better than the oppo dac 

playing dsd that is downgraded to pcm on the nad m51 is not very good  especially on the computer /jriver 

it is much better playing fdsd files on the oppo 105

 

 

i have not tired using the computer  usb to spdif cable .


Edited by screwdriver - 3/3/14 at 9:32pm
post #1075 of 1540

I'm pretty curious as to how others have their M51's connected and in particular their volume settings?

 

After tinkering around with this DAC for a few days I find the output to be quite hot, and indeed hot enough when set at or approaching 0db to change the sound. As well at 0db I wouldn't be able to turn the volume on my CMA800R amp up past 8 o'clock or so.

 

Right now I am using the factory default fixed setting of -20db and this seems to give a more resolved and natural sound. I'm wondering if anyone else has noticed sound quality differences related to volume with this DAC?

post #1076 of 1540
You shouldn't, given its 35 bit architecture IMO.
post #1077 of 1540
Quote:
Originally Posted by boatheelmusic View Post

You shouldn't, given its 35 bit architecture IMO.

 

Yes he might because the DAC is performing internal up-sampling interpolation (with a high resampling factor) which produces overshoot that can result in clipping in the digital signal when the gain is 0dB.

If it does not apply a pre-gain before to account for that, of course.

 

That's the reason why Resonessence drops the output level by 10dB (or so) on the Concero when using their up-sampling filters (pre-gain).

 

IIRC, some people complained about clipping on the early firmwares and one solution was to set the volume to -1dB instead of 0dB (bug).

 

The CMA800R could also not like the hot output's level.

post #1078 of 1540
OK, but he wants to turn the DAC down, not anywhere near 0.
post #1079 of 1540
Quote:
Originally Posted by boatheelmusic View Post

OK, but he wants to turn the DAC down, not anywhere near 0.

 

I assumed that the difference in sound he noticed was between -20dB and 0dB, not -20dB and any other volume setting?

post #1080 of 1540
My point is if 0db is too hot, gturn the M51 down without penalty!
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