Aurorasound

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file:///C:/Users/win10/Downloads/Banc-essai-Hi-Fi-news-Aurorasound_Vida_Prima-6.pdf


Voir le deuxième paragraphe .


LAB
REPORT
AURORASOUND VIDA PRIMA
Similar in name only to the original VIDA [HFN Jul ’13], the VIDA
Prima employs a far simpler, part-active (low frequency)/part-
passive (high frequency) RIAA network. The headline differences
in performance between the two are as follows: the costlier
Vida offers superior input overload margins, a higher output
and lower noise via MC, while the VIDA Prima trades this for a
wider MM S/N ratio, a much flatter and extended HF response
and lower overall distortion. Talking of distortion, this is indeed
exceptionally low at ~0.0002% through the midrange, increasing
slightly to ~0.001% at the bass/treble frequency extremes [Graph
2, below]. In practice this is of academic interest only as the
typical pick-up’s distortion will be 1000x higher (re. 5cm/sec).
Its equalised response is also comfortably beyond that of
any pick-up, albeit very slightly ‘flatter’ on the left than right
channel, at ±0.4dB from 100Hz-100kHz and with a subsonic
filter of –0.5dB/20Hz down to –6dB/4Hz [see Graph 1, below].
The output impedance is usefully low at 45ohm through mid
and treble, increasing to 100ohm/75Hz and 715ohm/20Hz [blue
infill, Graph 1]. In its MM setting, the VIDA Prima offers +40.5dB
gain (47kohm loading) and a generous 90.5dB A-wtd S/N ratio.
So this is a very quiet MM stage with an input overload
margin of 89mV – this represents a headroom of +25dB
to accommodate the wildest of vinyl grooves (re. 5mV at
1kHz/5cm/sec). The MC input includes an additional +23.9dB,
realising a total gain of +64.4dB, but the A-wtd S/N ratio of
71.3dB is slightly reduced (re. 500μV) and the 5.6mV overload
margin is less generous.



With a headroom of +21dB (or +19.4dB
re. its 0.6mV sensitivity), the VIDA Prima’s MC input is best suited
to medium- rather than high- or low-output MCs.



Le cr d'HifiNews , ci-dessus , dit , effectivement , dans la partie LabReport , que ce pré phono est mieux adapté aux cellules mc à niveau de sortie moyen qu'à niveau de sortie bas ( moins de 0,6 mv ) ou élevé ( 2 mv et plus ) .

Il est possible de raccorder une cellule mc de 2 mv ou plus à l'entrée mm du pré phono .

Faut voir , ensuite , si le niveau sonore sera suffisant , à l'écoute , sans tourner le bouton de volume à fond .
Sachant que certaines cellules mm atteignent ou dépassent 5 mv de niveau de sortie ...