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SNR and Dynamic Range... Myth??
Old 2nd July 2002
  #1
Here for the gear
 
🎧 15 years
SNR and Dynamic Range... Myth??

This has been a debate between myself certain gear manufacturers and retailers...

Is it safe to assume that, under perfect conditions (balanced power, no radio interference, etc.) a unit can live up to it's published specs for noise and dynamics?

Example: If I grab a Mytek A/D rack, can I punch "Record", analyze the output, and really, REALLY just see the little bar floating care-free right around the -120dB mark? Assuming there is a device connected that has a SNR of at MOST -120dB?

Curious... Anyone?
Old 15th June 2011
  #2
Gear Maniac
 
🎧 10 years
!!!!!PUSH PUSH PUSH!!!!!
!!!!!!!!
!!!!Nearly 9 years later!!!!
Old 15th June 2011
  #3
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by Mercuri ➑️
This has been a debate between myself certain gear manufacturers and retailers...

Is it safe to assume that, under perfect conditions (balanced power, no radio interference, etc.) a unit can live up to it's published specs for noise and dynamics?

Example: If I grab a Mytek A/D rack, can I punch "Record", analyze the output, and really, REALLY just see the little bar floating care-free right around the -120dB mark? Assuming there is a device connected that has a SNR of at MOST -120dB?

Curious... Anyone?
at what sample rate are you talking about? i have mytek 192s. if i set the frequency to 192 the noise level is sitting on -80. however apparently this is just out of band noise because of the chips used on the main board...
Old 15th June 2011 | Show parent
  #4
Lives for gear
 
🎧 15 years
I know how you feel......

I was wondering the same thing. After I bought my Apogee AD16-x, I was wondering why my levels from my Lynx inteface mixer were all hovering around -80 with my preamps connected, and even for channels where nothing was connected, I never saw levels dip down to -120 where I figured they'd be since the specs on the AD16-x give it a 120 db signal to noise ratio. Apparently there is noise in the sub and supersonic range that causes this.. I've heard of this with the Echo Audiofire line as well, where this noise is seen on the meters but is imperceptible to the ear...
Old 15th June 2011 | Show parent
  #5
Lives for gear
 
🎧 10 years
You do know that the OP is from 9 years ago don't you?

But regardless, and assuming that equipment has been connected up correctly etc. you're not always going to achieve performance that matches the published specs simply because sometimes published specs are produced by measuring under unrealistic conditions ...

So yeah, re. the OP - if the published specs are realistic and accurately measured, then it's not unreasonable to expect to be able to reproduce them.

if
Old 15th June 2011 | Show parent
  #6
Lives for gear
 
myles's Avatar
 
🎧 15 years
Please don't tell me you're using the meters in Pro Tools for this snipe hunt...
Old 15th June 2011 | Show parent
  #7
Lives for gear
 
🎧 10 years
lol
Old 15th June 2011 | Show parent
  #8
Lives for gear
 
3 Reviews written
🎧 10 years
Quote:
Originally Posted by Schizzo ➑️
!!!!!PUSH PUSH PUSH!!!!!
!!!!!!!!
!!!!Nearly 9 years later!!!!
hahhaa you're crazy :-)
Old 15th June 2011 | Show parent
  #9
Lives for gear
 
3 Reviews written
🎧 10 years
Quote:
Originally Posted by timlloyd ➑️
So yeah, re. the OP
if the OP is still alive and on GS
Old 15th June 2011 | Show parent
  #10
Lives for gear
 
🎧 15 years
Ok...OK.... you got me !!!

9 years later !!! OMG !!!!! But the problem still exists !!! The meters are showing noise, that I can't hear !!!!!!!!!!!!!! hahhahahaha
Old 15th June 2011 | Show parent
  #11
Lives for gear
 
🎧 10 years
Username: Mercuri
Last Activity: 27th May 2003 11:19 PM



Anyway, if you want to test your converters, just do a loopback - connect the output of one channel to the input of another with a short cable and record without any music going out. You can analyze the noise floor of the resulting 'silent' track to your heart's content.

You can also use RMAA to do the analysis for you. In my experience, the noise floor specs are usually about 5-6 dB higher than what manufacturers claim.
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