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TommygunZA

SD 633 MP3 recording Sounds lousy

12 posts in this topic

I recorded one of my files as an MP3 on my SD633 and I must say the playback on the SD sounds pretty shocking. I recorded at 192kbps and it is all artifacty and has those high pitch squiggly sounds. It sounds vaguely better played on my PC. Is this a standard thing with the 633? Currently  Im just taking the wav files and encoding them using Audacity and they sound a million times (well at least twice) better than the native MP3s. Im going to have a shot with 320kbps and see if its any better.

Has anyone else noticed this? Im only trying as a client wants stuff as MP3.

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That's a bit surprising, although I've never had a reason to record MP3. Suppose you can always just convert to MP3's on your computer.

 

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Reload firmware and restart using factory settings.   This happened to me... it took awhile to figure out but there were other anomalies as well.  Limiters activating with fader closed - weird stuff.  

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Gosh...thanks John, Ill give it a go and report back.

 

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As well, it's probably good practice to reformat your cards after a firmware update.

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It's weird. The above are on target. In a simple universe, transcoding mp3 file to wav files don't get you any advantage.

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Reflashed my SD633 from 4.50 to 4.51 (at least I got an update out of this process). Did a factory reset and proceeded to record to my (reformatted) SD card (approved media) Did some recordings at 192kbps and have exactly the same artifacty squiggly sounds in the background (its not massive but it is there) Did the same on my Zoom H4n (mp3/192kbps). No artifacts on the Zoom recording (admittedly higher noise floor). Its not a train smash as I mentioned, I can take the ISO's and encode to MP3 on my PC I was just kinda expecting better from Sound Devices? Id love it if any other 633 users gave it a go and reported back.

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Have you contacted sound devices?  Perhaps your the lucky person that discovered a possible bug?

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(ambivalent smiley face) 

Good point, ill mail em now.

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I've opened a ticket with SD and they suggested exactly what JohnGooch said I should do..which didn't help. Could I ask any of you who have a mixer (SD633) and mic close to hand to try record a brief  MP3  and have a listen to see if you get the artifacts too. It would make trouble shooting a lot easier if there are a few SD633 owners with the same problem. Ill report back if the SD help desk sort me out.

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It would make trouble shooting a lot easier if there are a few SD633 owners with the same problem. Ill report back if the SD help desk sort me out.

I have tried this now with my 633 and can confirm that I have got some very noticeable artifacts even at 320kbit/s.
Have you heard back from SD yet?

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I just did a test on mine, close voice in an ambient neighbourhood with leaves rustling and distant traffic.  At 128 I had a few unexpected and shocking warbles on the voice.  The background ambience was somewhat squiggly, but about what you would expect at that bit rate.

At 320, the same test sounded OK, less squiggly in the ambience and no warbling on the voice.

Not exactly a scientific comparison to whatever you guys are doing recording for your tests, but some feedback anyway... - I thought 320 sounded all right, but I expected better from 128...   With Mp3's I expect a loss of resolution and some squiggles on high frequency complex sounds (like water or tree leaves), but the large warbly artifacts on voice were unexpected.

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