如题，在外文资料中有个词汇不太认识，查也查不到。。。
“A side trip -- "Professional"
vs. "Consumer" Levels
There has always been
a lot of confusion about the whole issue of the nominal operating level of
"professional" gear versus the nominal operating level of so-called
"consumer" gear.
You may have heard that professional gear is "+ 4 dBu" and consumer
gear is "- 10 dBV." Because only professionals used this stuff back
when it was new (and expensive!) technology, and the older dBu designation was
all they had to work with, the original designation of operating level
(expressed in dBu) has stuck. By the time consumer audio products were
introduced in a big way, the dBV has been invented, and so dBV was used for
consumer gear. (Remember, they are both simply ways of comparing voltage levels --
nothing more. That + 4dBu is somehow inherently "better" than -10 dBV
is a big, fat myth, kept alive by the somewhat arbitrary labels of "professional"
and "consumer" attached to them.)”