Hi help needed on a noticeable difference between mp3 and wav!

Discussion in 'Mastering' started by djbolly, Mar 24, 2012.

  1. djbolly

    djbolly Active Member

    Its been several years my working on music but I am able to do some better mixing now.

    I mixed a session onto a wav file today.

    It played fine.

    I converted it into an mp3 and found some bass distortion and bass-kind noise.

    Interestingly the EQ on mp3 wouldnt fix it. Since it was spread through the freq band!

    Even if I would use high pass eq, cut down all bass and even mid, I could hear the distortion.

    This distortion does not exist in the wav file.

    I have uploaded the sample to
    What You Say by John Todd | OurStage

    Would be great if someone can help and tell in what stuff could get distorted in mp3 when converting from wav


    Thanks a lot!
    DJB
     
  2. CL2Zero

    CL2Zero Active Member

    There are a lot folks on here who are better qualified to answer this. But, what I want to know is how (what program) are you using to convert the wav to MP3?
    And, what bitrate are you converting to. I think a lot of MP3s are at 128kb. Which you will hear "artifacts" in the sound. If you can raise the bitrate up it will definitely help.
    I usually convert wav files to MP3 at 320kb. They really do sound better at a higher bitrate.
    If you can, give that a try and see what you think.
     
  3. djbolly

    djbolly Active Member

    Hi I am using Audition to convert it to mp3. It is 320 kbps. The part of the file that has more prominent noise is at http://www.skivamusic.com/mods/11.mp3

    This noise is not present in the wav. I dont know if it is clipping noise, it should not be.
     
  4. wilsb8

    wilsb8 Active Member

    How hot (loud) was this mix?
     
  5. CL2Zero

    CL2Zero Active Member

    I'm not real familiar with Audition, but that shouldn't matter. I wonder if the bassy parts in that section are over driving the outputs.
     
  6. audiokid

    audiokid Staff

    YIKES, WARNING!!!!!!!! damn near blew my monitors!

    Your bass is way over produced.
     
  7. djbolly

    djbolly Active Member

    Thanks a lot all who replied, yes I am going to check my track for two things, loudness and overproduced bass. I was using a softer bass earlier and switched to FL Slayer bass which sounded powerful. Thanks again,
     
  8. djbolly

    djbolly Active Member

    Cutting off the sub-bass (<80) from the bass track removed it. thanks again,
     
  9. hueseph

    hueseph Well-Known Member

    Strangely enough, I didn't hear the distortion but I think this is due to my monitor's inherent inability to reproduce anything below 100 Hz.
     
  10. wilsb8

    wilsb8 Active Member

    I didn't exactly hear any distortion but I do hear quite a lot of bass.
     
  11. TheJackAttack

    TheJackAttack Distinguished Member

    This whole bass issue is the primary reason "mastering" requires a great room and quality monitors. 95% of time mastering is done without a sub attached on purpose.
     
  12. RemyRAD

    RemyRAD Guest

    With this kind of content, you don't want it to be normalized at 100%. The MP3 Pro encoder in Audition is wonderful. I use it all the time. What you should be doing is setting your normalization to DB instead of percentage. Tweak the normalization to -.6 DB, on your master ".wav " file. Then convert to 128 kb per second MP3. It should sound good then. 320 kb per second only extends the frequency response of the high frequencies it does not prevent any kind of distortion. There will always be MP3 artifacting since you are taking out 80% of the data. The algorithm can't exactly ask you what data you want removed. And not everybody wants to take or accept 320 kb per second MP3's.

    When it gets to 100%, a lot of digital to analog converters really crap out. I personally didn't hear any distortion other than some clicks which may have been indicative of previous overloads? Your file was rather brief so it was hard to tell. That low-end was rather abundant. And how do you expect that to play on a system with subwoofer's? It's already over subbed and over woofed. We had an earthquake here in Northern Virginia last year and I don't want to feel another one.

    And what with, I bid you adieu.
    Mx. Remy Ann David
     

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