I did some comparisons today and the consumer Sony minidisc did well
again.
Spending some time while helping a sick relative.
One Mic, One Pre, One A/D, two minidiscs and a laptop.
Mic is a Senn ME-62.
Pre a RME Quadmic
A/D and Mixer a RME Multiface
Signals sent to two Sony Minidiscs recorders.
Minidisc #1 was analog line input MZR-55.
Minidisc #2 was spdif input MZR-90.
Then both were output through the same Minidisc at line level out into
Multiface and recorded with the laptop using Audition. Then mixed to
one stereo file with each machine having a channel. Levels were
equalized between the two channels.
Results show essentially the same results also by ear the results were
about the same.
This leads me to believe that maybe the spdif input still goes through
the same a/d conversion as a line level input to a Minidisc.
Next I inputted the ME-62 into the Quadmic and Multiface and recorded
to one Minidisc by SPDIF and direct to the laptop at 16/44.1. Each
were given a channel in one stereo track and levels were equalized
between the two.
Of course there was some difference at 17,000 and above as well as 50
and below. So to be fair I resampled to 11,050 khz so that the sound
would be closer to the same.
Results were not the same.
The left channel is the laptop and the right the MD. As you can hear
my house is not as quiet today as Robs was.
During the first half of the recording there was a range fan on 25
feet away in another room that I walked over and turned off.
You can also hear a compressor running in the very distant basement
that shows itself as the 60 cycle hum with harmonics above.
Ok, I won't be yelling down the street artifact because I don't have a
MD with digital output. But note how the image of the clock moves
from the right to the left sides during this recording. What I find
strange is that the right side is the MD. Looking at the numbers and
graphs they are very close. So I have a real hard time figuring out
why the MD channel would sound louder during this distant fan (white
noise) event. Coloration or artifact?
2.5 meg download.
http://home.comcast.net/~richpeet/lapvmd.wav
Rich
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