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Help with compression and dynamic range

I'm 51. After a 15 year period of dealing with mortgage payments and childcare needs, I'm trying to get back into higher-end audio quality - especially when it comes to dynamic range in concert DVDs. I've recently spent countless hours trying to research CDs, MP3s and compression issues - with no resolve.

How can I tell which concert DVDs offer wider dynamic ranges? Or, for that matter,CDs? Is there a rating on the covers? I'm willing to do my homework if anyone can give me a reference. I've just read "Get Better Sound" by Jim Smith with no resolve.

Also, I'm looking to purchase a DVD player which will maximize sound quality when I can determine which DVDs and CDs are recorded with minimum compression and wider dynamic range. Can anyone explain what to look for when purchasing a higher-end DVD player. I've seen ratings for DACs, but am unsure what they mean.

ANY help is appreciated.
kewadinbob
saki70
907 posts
 
Onhwy61 ;
Maybe we are talking about two different things here .
What I am referring to when I speak of compression is the
omission of the highs and lows . This is what is done , as you mentioned , on FM radio . I get the same kind of reduction on some CD's and LP's . It kind of sucks the life out of the music . It is akin to putting a blanket over your speakers . And then on other recordings the highs and lows are present and the music just sings ! Not so much about the dynamics or loud and quiet passages but the extension .

Thank you
saki70
907 posts
 
Kewadinbob ;
Doing your homework will consist of reading recording reviews , if you can find them , or just taking a chance . There may be 2 , 3 or more prints of the same album that may or may not contain the same sound qualities often from different manufacturers . I've had three different prints of 'Dark Side of the Moon' on CD . They all were compressed . I have a LP that is not . I have George Harrison 'All Things Must Pass' LP set . The first song on side A of the first record is pretty good . All of the rest of the songs are compressed ! It sounds like somebody covered the mic's .
My experience has shown it to be pretty much a hit and miss situation . I hit the thrift stores to try them . Then donate the misses and keep the hits , sometimes having to repurchase better condition copies from resellers .
Good luck and enjoy the hunt !
synthfreek's avatar
synthfreek
627 posts
 
This is the first time I've ever heard compression defined as "the omission of the highs and lows."
saki70
907 posts
 
Some of us have different definitions for terms than others .
I look at compression as taking away the highs and lows and compressing the audible signal into a narrower frequency range . For instance reducing a 20hz.-20k.hz band range ( an average audible range) and compressing it down to say 150hz.-16k.hz.
I am not ignoring dynamics , soft to loud . It's just that I find compressing the audible signal range to be more deleterious and experienced more often .
But this discussion is off topic .

Happy Tunes
onhwy61's avatar
onhwy61
5,144 posts
 
That's not a definition of audio compression. What you're referring to is bandwidth limiting. In the example you suggested 3 octaves of bass, but less than a half octave of treble are removed. With anything approaching a full range musical passage that level of bandwidth limiting would sound unnatural.
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