digital Filter in CD Player ?

[Michael Buchstaller]

Hello Group,

to get some clean test signals for my various amps, i dedided to
create test tones in sound forge on the PC and made CD´s so i could
play them via my CD player without the need to use a computer on
the bench.

Testing with sinuses from 1 HZ to 5 KHz was OK, everything came through
fine. But when i am using square signal, at most frequencies i do not get
any output from the CD player (a NAD 502).
Is there possibly some digital anti-noise-filter that interprets the 0db Square-
wave as clics and suppresses them ? If yes, is this common practice with
all Cd players, or are there any models that do not tr to filter the output ?

BTW: Of course i could use my modular as a test tone source, but i hate to
calibrate the VCA for a specific frequency; and i find it handy to use a
standard consumer device like a CD player that is available everywhere
as a signal source.


-Michael Buchstaller