[LAU] Portable Digital Recorders

[Kevin Cosgrove]

On 1 February 2010 at 21:00, =?ISO-8859-1?Q?J=F6rn_Nettingsmeier?= <nettings at folkwang-hochschule.de> wrote:

> but check out the EIN column:
> 
> > POCKET                 DIMENSIONS       VOL  MASS  PRICE  XLR  MIC  EIN
> > -------------------    --------------  ----  ----  -----  ---  ---  ---
> > Sony     MZ-RH1         85 x  84 x 15   107   106  $ 350    -    -  124
> > Olympus  LS-10         132 x  48 x 22   139   165  $ 300    -    +  122
> > Olympus  LS-11         132 x  48 x 22   139   165  $ 400    -    +  122
> > Sony     PCM-M10       114 x  64 x 22   161   187  $ 300    -    +  122
> > Marantz  PMD620        102 x  62 x 25   164   170  $ 400    -    -  112
> > M-Audio  MicroTrack II 109 x  63 x 28   174   192  $ 200    -    -  106
> > Korg     MR-1          120 x  64 x 24   184   200  $ 500    -    -  117
> > Edirol   R-09HR        113 x  62 x 27   186   166  $ 300    -    +  118
>
[snip]
> 
> if that means what i think it means (equivalent input noise), and i'm 
> not totally out of touch with the state of preamp technology, i'd say 
> all but the 106, the 99 and the ? are bogus. and i'm not even sure about 
> the 106 :)
> i wonder who makes these figures up? or is there a legal way to doctor 
> the measurements to actually yield such values without being sued?

Could it be that EIN refers only to theoretical quantization noise of 
the units?  I didn't run that calc.

I'm also suspicious ~120dB equivalent input noise, presuming the sign 
of that number is negative.  Well, with either sign the number seems 
fictitious.


--
Kevin