Car audio gurus!
- Thread starter ALF
- Start date
JL Rockies
Binders Fulla Expo
- Location
- Draper
"Crest Factor" (since I mentioned it in my post) is a measure of the difference between a songs peak energy and it's average energy and is expressed in dB. When the CD first came onto the scene in the 80's engineers took advantage of the amazing dynamic range the CD offered and most music of the time was recorded with a crest factor of 18dB or more. As time went on, crest factor reduced as engineers wanted their CD to be the "loudest" in the changer then got reduced more as people wanted to download music and listen to it on multimedia speakers and headphones. Since 2000, you'd be hard-pressed to find music with a crest factor of greater than 9dB as engineers create a "wall of sound".
Here's an analysis I put together for a training I helped develop for JL Audio called "School of Sound: A Short Course in Audio" which we exposed the top 10 myths in audio and analyzed what was the "real" cause of speaker failures in an effort to reduce warranty claims for our company and our retailers. I also taught an 8 hr course at MERA KnowledgeFest each year which included Ohm's Law, transducer design and magnetic theory... it was always the fully booked course (I'm kind of a big deal).
Here's Godsmack and Evanecense:
If you look at the graphic, you're looking at the left and right channels and the less crowded pairs is just a zoomed-in version of one point in time of the lines above. The top and bottom lines of the charts equal the maximum range of the CD (a CD's have been recorded to the same maximum "volume") the dark areas are the song. I know it's hard to see without the hand-out but if you look at the zoom in of Godsmack you can see evidence of clipping at about the 3/4 mark... this recording is pre-clipped for your enjoyment and there's nothing you can do about it. These recordings are just under 10dB of full volume... to put it into perspective, a sinewave has a crest factor of 3dB. Excessive average power over time is what kills speakers... clipping and distortions cannot be avoided these days.
Here's an analysis I put together for a training I helped develop for JL Audio called "School of Sound: A Short Course in Audio" which we exposed the top 10 myths in audio and analyzed what was the "real" cause of speaker failures in an effort to reduce warranty claims for our company and our retailers. I also taught an 8 hr course at MERA KnowledgeFest each year which included Ohm's Law, transducer design and magnetic theory... it was always the fully booked course (I'm kind of a big deal).
Here's Godsmack and Evanecense:
If you look at the graphic, you're looking at the left and right channels and the less crowded pairs is just a zoomed-in version of one point in time of the lines above. The top and bottom lines of the charts equal the maximum range of the CD (a CD's have been recorded to the same maximum "volume") the dark areas are the song. I know it's hard to see without the hand-out but if you look at the zoom in of Godsmack you can see evidence of clipping at about the 3/4 mark... this recording is pre-clipped for your enjoyment and there's nothing you can do about it. These recordings are just under 10dB of full volume... to put it into perspective, a sinewave has a crest factor of 3dB. Excessive average power over time is what kills speakers... clipping and distortions cannot be avoided these days.
Jesser04
Well-Known Member
- Location
- Kaysville Utah
Evanecense and Godsmack suck my balls! You just lost your street cred.
But if the audio signal was recorded without clipping built in, would the case still be the same (legit question, not arguing).
Also, how do audio files that have been compressed to MP3 or AIC look when analyzed the same way? I imagine it's even worse?
On a side note, that's exactly what I hear when I listen to Godsmack or Evanascence. A black blob of shit all strung together.
Also, how do audio files that have been compressed to MP3 or AIC look when analyzed the same way? I imagine it's even worse?
On a side note, that's exactly what I hear when I listen to Godsmack or Evanascence. A black blob of shit all strung together.