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  »  New  Digital recorders: what the "big boys" use?..  Not that wild stuff...  Didital Things  Forum     13  75870  01-05-2005
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02-11-2007 Post mapped to one branch of Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-28-2004

Post #: 1
Post ID: 3713
Reply to: 3713
Metaxas-Wolfson ADC with Sound Devices SD744T
An email that I got from Kostas Metaxas, (posted with Kostas’ permission):

//****************************** BEGIN *******************************

I wanted to share some of my preliminary findings using my newly developed A-D [Wolfson chip] to bypass the SD744T inputs/ADC.

This is very early days as I've just started playing with this external ADC, but you can already easily hear  the WOLFSON's "potential".

Here is the SM8 dubbed to the analogue inputs [1&2] of the Sound Devices 744T, using it's internal amps/ADCs
http://www.reel2reel.tv/samplers/_SM8_744Tanalogue_in_Benaud.wav
[170Mb 5min sample 24bit/96k]

Here is the SM8 dubbed to the Metaxas - WOLFSON ADC - SPDIF output to Sound Devices 744T SPDIF in
http://www.reel2reel.tv/samplers/_SM8_MAS-ADC_744T_SPDIFin_Benaud.wav
[170Mb 5min sample 24bit/96k]

Here is the SM8 dubbed to the SONY DSR11 DVCAM VTR, using it's internal ADCs
http://www.reel2reel.tv/samplers/_SM8_SONYDSR11_BenaudA.wav
[88Mb 5min sample 16bit/48k]

You can view a track from this concert to see how the mics/musicians were lined up. I was using Neumann M150s in AB and TLM50s in XY:

http://www.reel2reel.tv/SCREENERS_WMV/__benaud_stairway-1a.wmv

The background noise is the "airconditioning"....the blight of location recordists!

The Metaxas-WOLFSON - I'm using the WOLFSON chip since it has recently been favourably reviewed in the audiophile press [mostly as a DAC actually]. I'm not using any input buffers, and have removed all the goofy big ceramic caps from the signal path to the differential ADC inputs. Then, I've added my own ultra-low noise discrete regulators - isolating the clock with it's own regulator from the rest of the board. All driven by 8 AA batteries which will run it for over a day.

Listen to the huge "weight" in the sound. To me this is the key. And this is the problem with all the location recorders I've tried so far [including Nagra V, Aaton Cantar and Sound Devices]. So I'm hoping that by using my ADC with the SD744T, I should be able to recover the rich, huge, "blooming" bottom that the Neumann's easily record onto the Stellavox. Of course this ADC can be used with NAGRA etc as well...

I'll be using it in the field to record a few upcoming festivals, so will keep you posted with how things turn out.

Rgds,
Kostas


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-12-2007 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-28-2004

Post #: 2
Post ID: 3723
Reply to: 3713
The misery of the “Sternway to Heaven”

I find the Kostas’ experiments are VERY interesting and his idea of using the SONY DSR11 is very innovative. Unfortunately I do not think that nowadays 15bit is “enough”. I know a guy who uses film’s CGI processors to record at half mHz, that I do not think it is necessary… What is interesting in Kostas’ A/D experiments that he is not just plays with all those toys (or regularly records FM broadcast as I do) but he is actively recording AT THE FIELDS professional. So, Kostas’ progress is very much worth to watch and I hope he has access to more interesting and to more serious performances…

I would live aside the technical aspect of the Kostas’s demo above and would like to point out other thing. I find this classical trio playing their rendition of Led Zeppelin’s “Stairway to Heaven” was very illustrative. Sure, I do not like how they played it. The piano guy was in particularly off the wall with his almost-jazzy phraseology. However, the biggest thing that came to me was my view how primitive this music is when it striped down to its core. I would anchorage everyone listening the last 16-bit track (it is not heavy for your traffic). Pay attention how primitive the composition is musically. It the peace was composed as a classical short classical trio peace then it would be completely about NOTHING.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-12-2007 Post does not mapped to Knowledge Tree
deemon
Posts 23
Joined on 05-25-2004

Post #: 3
Post ID: 3725
Reply to: 3723
Misery or misunderstanding ?
 Romy the Cat wrote:
I would live aside the technical aspect of the Kostas’s demo above and would like to point out other thing. I find this classical trio playing their rendition of Led Zeppelin’s “Stairway to Heaven” was very illustrative. Sure, I do not like how they played it. The piano guy was in particularly off the wall with his almost-jazzy phraseology. However, the biggest thing that came to me was my view how primitive this music is when it striped down to its core. I would anchorage everyone listening the last 16-bit track (it is not heavy for your traffic). Pay attention how primitive the composition is musically. It the peace was composed as a classical short classical trio peace then it would be completely about NOTHING.

Ha-ha , Roma , I cannot agree with you here . You see - Led Zeppelin played the music that isn't "classical" at all ! So you ( or anyone ) cannot demand this piece to sound good being played by any "classical trio" , it's out of the question ! 90% of musical information that was "packed" in this piece of music cannot be described in the terms of musical notes , intervals , etc . And it of course cannot be performed on piano , even on Steinway ;-) - it needs electric guitars , drums , Robert Plant's voice , of course .....  So your example looks like this old familiar anecdote from Odessa , when "Rabinovich sang Caruso" :-)  I think that your example can show only those musicians misunderstanding , but not the misery of the music itself !

By the way , it's not the only one example of "misinterpretation" of music . Another , much more well-known one - "Jack Loussier trio plays Bach" . I listened it only one time - it was terrible .
Page 1 of 1 (3 items) Select Pages: 
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Digital recorders: what the "big boys" use?..  Not that wild stuff...  Didital Things  Forum     13  75870  01-05-2005
  »  New  A littlie D-War: Bidat vs. Lavry Gold..  RE: the "New" DAC...  Didital Things  Forum     13  129456  12-18-2005
  »  New  Recording options: Pacific Microsonics vs. Lavry Gold...  Pacific Microsonics vs. Lavry Gold in D/A mode....  Didital Things  Forum     24  174323  09-27-2007
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