Some frequency dependant compressors have expansion capability as well - simply because high frequency sound will be compressed more heavily than low frequencies...

One of THESE might help, and here's a load of choices, including the Manley and Avalon offerings:

http://www.muzeekworld.com/recordingproducts-compressors.htm

Problem is that you can then make most recordings sound "nice" - which then begs the question whether hifi is about listening to music and always enjoying it, or about accuracy of replay..

Bit of both sounds good to me!