![]() Dodgy manufacturer specs aren't all that uncommon.Ĭlick to expand.That thing is insane. An identical SNR spec for both mic and line inputs seems suspect, too. About 5.7 Vrms is +17.3 dBu - at least 2 dB short of the +20 dBu max input spec, but at the same time well above the supposed +10 dBu 0dBFS reference level. Official specs for the Firebox do not seem to line up with your findings. These were common back then, but you could probably do better these days (some reverse-engineering and part value adjustment may be required to extract best performance). ![]() ![]() The thing is supposedly full of MC33078 (dual) and 33079 (quad) opamps. So distortion seems about right, while some dynamic range was clearly left on the table. Frequency generation seems to have a bit of a PSRR problem (and distortion worsening at 96 kHz is clearly pointing towards some issues, possibly correlated jitter which may be a layout or power-related issue), and booting requiring an external PSU may suggest some degraded electrolytics in the power section (I mean, this thing should be from the mid-2000s, when such problems ran rampant, and Presonus isn't exactly the kind of brand to use premium components).ĪDC: AK5384 (4ch) - DR 107 dB(A) - THD+N -100 dB - filter ultimate -80 dB - filter ripple +/-0.005 dBĭAC: AK4358 (8ch) - DR 112 dB(A) - THD+N -94 dB
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