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Bad sound in rockbox.... why? please help

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strider:
Hi. I checked the frequency response of my iPod in rmaa.
Equalizer, bass, treble have been disabled.
I got a bad result. AppleOS sounds correct, but RockBox worse.
Why RockBox has hishelf filtering?

I attached graph

markun:
Which ipod model do you have? Have you disabled the EQ while doing the test (I assume you have, just making sure)

We have had problems with players sounding slightly worse than the original firmware in the past, including some ipods and I believe the iaudio X5 (but can't find the thread for that one)

http://forums.rockbox.org/index.php?topic=9609.45

They had different causes, so I can't tell you what is likely to be wrong.

saratoga:
Does the headphone output look the same?  Can you post the full RMAA report?

strider:
my new test)))
i has firmware with  sw eq (24 band).(isanggon)
hw eq is disabled.
changed coupling capacitors.

sound better then in my comp. ))))))))

soap:
Are you testing with lossy-encoded files?

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