Audio hiss on Sam440ep-flex in Update 1 and 2

I really thought I had seen several topics about this issue, but I can't find them.

So either my search-fu is weak, or I'm imagining things again.

I have a Sam440ep-flex 800Mhz. Since installing Update 1, I get a soft hiss sound almost constantly from my speakers. Sometimes it goes away for a little while, but it usually comes back. If I'm actually playing sound the hiss seems to stop until the sound is done.

I had this issue when I first got my Sam, but fixed it somehow, and don't remember how.

I am using the updated audio drivers from OS4Depot. (http://os4depot.net/index.php?functio ... e=driver/audio/cs4281.lha)

Any ideas?

(Sam 440ep-flex 800 Mhz, 1G RAM, 30G SSD, DVD-RW, 350w power supply, 1920x1200 monitor on a Radeon 9250 128M)

@jbni
If the hiss appeared with Update 1, then my guess is it was caused by changed settings in an (updated) audio Mixer program. You can find it in "Sys:Utilities/Commodities/", or it may already be running (check Commodity Exchange to open it).

Ensure that Mixer is set to mute everything EXCEPT Playback PCM, Playback Master, and (if you have analogue audio CD support) Monitor CD. Muting means reducing the volume as far as it will go (e.g. -34.5dB).

@ChrisH

Everything is muted except PCM and Master. Reducing the PCM volume reduces the volume of the hiss faster than it reduces volume of other sounds played.

Meaning, if I reduce the PCM volume and then crank up my speakers to compensate, the hiss is less noticable, but still there.

Reducing the Master volume doesn't change the hiss-to-actual-sound ratio.

I also tried using the mixer here http://os4depot.net/share/audio/misc/mixer.lha uploaded yesterday; same result.



--jbni

@jbni

I've just noticed this too on my flex... time to upgrade!?

What a great idea!

@Slayer

Unfortunatly, that's just not economically possible.

I wonder if an add-in sound card would help?

What PCI sound cards are supported under 4.1?

@jbni

I had a lot of noises before all updates so I've bought SBLive! and the sound is very crisp and clear now. It costs few euros.

@jbni

I have a sam flex 733mhz and no his problems at all with 4.1u1 and 4.1u2. I never tried it with 4.0. Maybe it's a hardware problem, could be a bad capacitor in the filter or similar. I think your best bet is to put in a sound card, just remember it's got to be 3.3v compatible.

@Severin
No noise problems with my Sam Mini-ITX either.