Reference Level

The Music Telegraph | Text 2019/01/26 [13:36]

Reference Level

The Music Telegraph| 입력 : 2019/01/26 [13:36]

▲ Reference levels (Line level)

© Columbia University



 

Reference Level

 

 

Reference Levels (U.S.A. Standard)

1. Mic: -50 dBu

2. Line level:

==> Professional (Studio level): +4 dBu

==> Semi-Pro (Consumer level): -10 dBu

 

 

 

▲ Voltage is divided between two impedance:

EQ : 900 Ω --> 0.9 v

Trim pot : 100 Ω --> 0.1 v

( EQ  Ω : Trim pot  Ω = 9 : 1)

___________________________________________________________________________

-50 dB (Mic ref. level) + 70 dB (preamp: Maximum input level) = +20 dB MOL (Maximum Operating Level)

If more than -50 (e.g. -45) then -45 + 70 = +25 (over MOL) ==> Distortion happen

© The Music Telegraph


 

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