True Peak <--> RMS

You talk about mastering. I would think remix to get the levels more inline with your new aesthetic. I would drop Boost 11 and go with a much better limiter when you go to master. I like Concrete Limiter but there other ones that will work nearly as well. For a really good and simple metering plus level control I would look strongly at Klanghelm YUMT.
 
http://www.youtube.com/watch?v=ug5UQNg8F4k Take a look at that vid. Its very helpful.

Ups, sorry:)
 
Thanks for the link, John:))

Baseman
Old mastered File:  -8 LUFS, True Peak -0,9,  RMS -8 dB
New mastered File:  -11 LUFS, True Peak -1 dB, RMS -11 dB
 
...what I have done to these old files to sound louder without peaking "True Peak"??
 

Peak levels have little to do with the perception of loudness, which is more closely tied to average RMS values. The older files, with an average RMS of -8 dB, are going to sound louder than the newer ones averaging -11 dB RMS. The ratio of peak to RMS is called the crest factor.
 
To bring the new file up to the same level you're going to have to lower the crest factor, sacrificing peak-to-RMS ratio for the sake of overall volume. That means squashing some peaks. You'll need to raise the average RMS by 3 dB, which necessitates lowering your highest peaks by the same amount.
 
This is where the quality of the limiter comes into play (along with many other factors; it's not all about the limiter but that's a big subject that entire books have been written about). Boost 11 isn't a very smart limiter. It works OK in some situations, especially if the amount of limiting is small. But if you want to be able to turn up the average RMS levels (and proportionally turn peaks down) it helps to have a smart limiter that can do this as transparently as possible.
 
I'd suggest taking a look at TB Barricade for a quality limiter that's very inexpensive. If you want to throw more money at it, Ozone would be an excellent choice. There are plenty of others, such as Voxengo Elephant and FabFilter Pro-L, but they require a fair degree of expertise to use them properly. Ozone makes it downright easy.

What threw me off was when he asked "how can I master the new songs to -9 dB RMS?", leading me to assume he wanted the new songs louder to match the old ones. Re-reading the OP, I see that he's trying to reduce the old files but finding the peaks consequently reduced by 4-5 dB in the process.
 
Heinz, your options may be limited. It depends on the original mix whether you'll be able to volume-match the two sets of files without reducing peak values in the old files. If you have a high crest factor, then it's just a matter of reducing it just enough to make the match, by simply raising the RMS less. But if your crest factor on the old files is low, you may have no choice but to lower everything, sacrificing peaks in the process.
 
If that's the case, assuming you still have the original project, you might go back in and examine things like compression on drums. If you've got severe compression on kick and/or snare, you may be able to back off the compression ratio and restore some of your crest factor. 

John
You talk about mastering. I would think remix to get the levels more inline with your new aesthetic. I would drop Boost 11 and go with a much better limiter when you go to master. I like Concrete Limiter but there other ones that will work nearly as well. For a really good and simple metering plus level control I would look strongly at Klanghelm YUMT.
 
http://www.youtube.com/watch?v=ug5UQNg8F4k Take a look at that vid. Its very helpful.

+1 to everything John said. i have really come to rely on the Klanghelm VUs. That video is also great. It really helped explain the new LU metering

Hi there:)
 
Thanks to all for answering, but I've decided to master the old Songs again, I like the Dynamic and the Sound much more than the Loud mastered old songs!!!!
They are all mixed to -3 dB Peak and about -15 to -20 dB RMS, so it's very OK for me to Master them to -15 dB RMS or LUFS (it's nearly the same)  and do just a little Final Equing and BASTA:)
Perhaps a Minimum of Compressing, and the Band will hear the Difference to the Loud Sounded Sh....! I hope so;)
 
Thanks and have a nice day or night, wherever you are:)
Heinz.