Steve House
Veteran
Got it !
It's in the card's specs :
Code:Nominal Input Level Input Jack 1–2 (XLR type):-50 to -10 dBu Input Jack 1–2 (1/4 inch TRS phone type):-35 to +4 dBu Input Jack 3–4: -10 dBu to +13 dBu (balanced)
XLR inputs will provide you a "low-level" signal, but Jack inputs will give you a way louder signal.
I just plugged my guitar to the FA-66 through a Jack cable, and the sound level is ok.
You have to plug your microphones through an XLR->Jack cable, I guess I have to buy two of these to plug my sm57&58.
You've got it backwards. The XLR is MORE sensitive than the TRS. The numbers indicate the range of levels of input signals that are able to drive the system to normal output. A -50dB signal is much much weaker than a -35dB signal. So a weak -50 signal can drive the system to normal output when plugged into the XLR but it takes a much stronger signal of at least -35dB to achieve the same level when plugged into the TRS. Your guitar is putting out a line level signal, much stronger than either of those numbers I expect and also is a HighZ source while they are LowZ.
The Edirol XLR inputs are rated down to -50 db. The Shure mics are rated at -56dB for the SM57, -55dB for the SM58. Even with the sensitivity control at maximum gain there just might not be enough 'ooomph' in those preamps to bring those particular mics up to an acceptable level. I'll guarantee you if you try to plug your SM57 and 58 in through XLR->TRS adapters you'll hear nothing but the sweet sound of silence as the mic's outputs are many times less than what is needed to drive the TRS input.
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