Building the Nathan 10 – short version

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Hi Markus,

Thanks a lot for the info about the defect of CS8420.

It seems Behringer has been using this chip on many of their products. I've used DEQ~, DCX~, and SRC~, they all come with this chip. (correct me if I'm wrong)

I've even played with CS8420 evaluation board before I got those Behringers for quite some time.

The link above said, when 8420 shows its flaw:
"
- dull sound

- darkened highs, muddy mids

- frying eggs or frying bacon sound on hevalily loaded musical program
"


This reminds me something interesting. When I used the CS8420 evaluation board, I made 2 inputs switched by relays. (After the relays, the signal was fed to a 75:110 pulse transformer and finally got to the board.)

One of the relay had bad contacts. It's sometimes dropped off completely, sometimes it seemed the signal was "partially locked". (I wonder if this is possible in digital?)

When it happened, indeed, <dull sound, darkened highs, muddy mids> are very good descriptions. Then I noticed the RTA screen of the downstream DEQ2496 -- a very clear and quite deep notch at 5kHz was shown.

No wonder the dull sound and darkened highs.

Swith the contacts on and off a couple of times could always clear this up. Then everything came back to 'normal'.

I don't know if this is related to the inherent defect of the 8420.

Another experience with 8420 evaluation board, a good one, is the sound seems smoother then the one within DEQ2496 operating in upsampling mode.

So, is that related to the statement: "It is easy to make your DCX surrender if you own a Behringer SRC2496 : switch it to 96KHz and enjoy the result !" ? Or it's simply an ironic expression, and I'm confused by my bad hearing and ignorant?

Oh, well.

I haven't come across the "frying egg sound", and other problems though.


ps. Sorry for the OT.

[markus76]

Thierry's statement was irony. I experienced the "frying egg" issue with a SRC2496 + DCX2496.

Best, Markus

[mat02ah]

Originally posted by markus76
What the hardware bug in the DCX is? Then take a look here:
http://www.dcx2496.fr/en/src1_en.php

Markus,

wow ... thanks. I experienced exactly this problem with a SRC2496 when using it as a DAC for my Mac and iTunes. In the end I was close to blaming the resampling algorithms of either iTunes or Mac OS X's Core Audio. I did of course realize that this only happended with the Behringer. Now I know why ...

Regards,

Thomas

[PB2]

Originally posted by markus76


There's no workaround other than switching the whole unit on and off or replacing it with a new board from a third party manufacturer. Behringer denies any problems with the DCX2496...

Best, Markus

No one has hacked the firmware, wonder if it is in flash memory?

Pete B.