I answered this question using the online Avixa education resources for the CTS exam. From my understanding in the book and the online content, I answered the question correctly, but the system is saying it is incorrect.
Did I answer incorrectly?
Sales Associate, Guitar Center
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Hi Anthony, close answer but on page 60 of the CTS exam guide, consumer line level is 0.316V. Best of luck. Keep posting your questions!
Gosh, thanks. My tired eyes were not seeing that. So where does the 1.23 V play factor in? My book still says 1V on page 60 for line level professional.
Hi, Anthony!
The book says, in page 60: "Line level in the professional audio system is in the vicinity of 1V."
Actually, the standard professional audio level is +4dBu. and dBu is referenced to 0.775V.
If we do the math, we have: 20 x log (1,23 / 0,775) = 20 x log (1.587) = 20 x 0.200 = 4.
So, this is the EXACT value for professional audio line level: 1,23V, which is +4dB above 0.775v (the reference for dBu).
But... we sometimes allow ourselves to say that 'pro audio line level is around 1V', as we read in the book... (When I teach the CTS Prep class, I always have a slide with the proper values for all dB references)
Good luck!
Thanks for the help. I wish the book and the questions matched better.