Best MP3 Audio Enhancer (for WMP)

[alienationware]

In no particular order:

iZotope OzoneMP (14 day trial)
http://izotope.com/products/audio/media/demo.html

FXsound DFX Audio Enhancer (limited function indefinite demo)
http://www.fxsound.com/

SRS Audio Sandbox (unknown demo time length)
http://www.srs-store.com/store-plugins/mall/sas-plugin.asp

Amphiotik Enhancer (unknown demo time length)
http://www.holistiks.com/amphiotik/modules.php?name=_hes_Documents&file=_products_amen_st

ANWIDA Soft V-Hyper HYPER VITALIZER (limited function demo)
http://www.anwida.com/product.asp?pid=27&area=2

4Front Technologies OSS3D (30 day trial)
http://www.oss3d.com/usite/

Others...

 

[The_Other_One]

Audacity is good, and totally free

 

[maroon1]

DFX 8 Audio Enhancement is the best audio enhancement I ever used, I have the demo version and it makes the mp3 sound better, specially if you have low bitrate mp3

You can download the demo version from here
http://www.fxsound.com/dfx/index.php?vendor=0&subvendor=0&plus=0&refer=0

The full version cost money

 

[alienationware]

DFX 8 is good, but there is a problem with hyperbass for some songs. If I crank it up to 10, the singer's voice becomes blurred.

Audacity is more of an "editor". Is there some freeware out there which does the same thing as DFX?