Pergunta a... Quem saiba! RIAA ou RIAA/IEC

Pois! É isso mesmo e só! ....
  

Qual devo escolher pois um dos meus pre tem estas duas opções mas não tenho o manual se é que foi  feito alguma vez para este módulo opcional ao Pre MF, Elektra E200? ...

Qual escolho e quando (em que condições), RIAA  ou RIAA/IEC??? ...
  

 

IEC RIAA curve[edit]

In 1972 an alternative version of the replay curve (but not the recording curve) was proposed by the International Electrotechnical Commission, differing from the RIAA replay curve only in the addition of a pole at 7950 µs (20 Hz).[8] The justification was to reduce the subsonic output of the phono amplifier caused by disk warp and turntable rumble.

This so-called IEC amendment to the RIAA curve is not universally seen as desirable, as it introduces considerable amplitude and -more importantly- phase errors into the low frequency response during playback. The simple first-order roll-off also provides only very mild reduction of rumble,[7] and many manufacturers consider that turntables, arm and cartridge combinations should be of sufficient quality for problems not to arise.

Some manufacturers follow the IEC standard, others do not, while the remainder make this IEC-RIAA option user selectable. It remains subject to debate some 35 years later.[2]

Fonte :
http://en.wikipedia.org/wiki/RIAA_equalization#IEC_RIAA_curve

Esclarecido! ...
  
Obrigado!!
  

  

Na IEC nunca tinha ouvido falar mas tenho ideia de que se deve utilizar a curva Enhanced RIAA; segundo li, serve para compensar a atenuação nas altas frequências introduzida pela máquina de corte.

R

ricardo onga-ku escreveu:

Na IEC nunca tinha ouvido falar mas tenho ideia de que se deve utilizar a curva Enhanced RIAA; segundo li, serve para compensar a atenuação nas altas frequências introduzida pela máquina de corte.

R

Pelo que percebi era uma correção aplicada nas maquinas de corte e não na reprodução :

The Enhanced RIAA curve[edit]

The official RIAA standard defines three time-constants with pre-emphasis rising indefinitely above 75 µs, but in practice this is not possible. When the RIAA equalization standard was written the inherent bandwidth limitations of the recording equipment and cutting lathe imposed their own ultimate upper limit on the pre-emphasis characteristic, so no official upper limit was included in the RIAA definition.

Modern systems have far wider potential bandwidth. An essential feature of all cutting lathes—including the Neumann cutting lathes—is a forcibly imposed high frequency roll-off above the audio band (>20 kHz). This implies two or more additional time constants to those defined by the RIAA curve. This is not standardized anywhere, but set by the maker of the cutting lathe and associated electronics.

The so-called "Enhanced RIAA" curve or "eRIAA" curve attempts to provide complementary correction for these unofficial time constants upon playback.