preamp that always have same output if input is not always same

[tonitonitoni]

i have problems with jukebox in a cafe .. some songs are louder and some are quieter ... i m trying to build preamp that will have automatic control of output volume so that output will always be same(or close as possible)....i searched a lot and i cant find anything.
does anybody knows something please help
i apreciate your help..
sorry on bad english ...

 

[Greg Erskine]

tonitonitoni,

I can't see how you could to it automatically. How can you determine dynamically if a section of music is soft or that the whole song has been recorded at a low level. It will be interesting to find out if it is possible.

I think you need to fix the source material assuming it is digital and accessible. Some music servers have volume compensation but I don't think it is automatic.

regards

 

[Geek]

A simple compressor in line with the preamp output will fix that.

Lots of schematics on the net.

Cheers!

 

[audiomachines]

hello,

you could try a Symetrix 421 AGC Leveler. Hope this helps HAPPY HOLIDAYS to the DIYAudio clan.

Best Regards,
audiomachines

 

[tonitonitoni]

tnx on replys i fixed that ...too much low end but maybe someone have use of it, two led paralel but reversed polarity and that for other channel too...clips bad but helps in this situation anyway it is mp3 juke