nowaysj wrote:macc wrote:The short answer is that ideally, when working with any processing at all (mixing, mastering, whatever), it is a very very good idea to match the perceived level before and after the processor. Then you can bypass bypass bypass the processor and hear only what the processor is doing, and not be tricked by the level difference. You can then make a true judgment as to whether the processing change is actually good, or if it is just different. Level matching is the only way to know for sure. Keep the perceived level the same the whole way through the chain, and make sure that everything you are doing is better - not just louder. Then make the final gain boost with the limiter.
If I'm missing further explication of this, please direct me.
In the past 6 mo or so, I've been getting really anal about a/bing with the exact same levels. If something is hitting -14.7 before, I get post fx output to hit -14.7. Then I judge if I'm making something better or louder.
But this is not what you recommend? You recommend matching the perceived levels? I have to admit, matching perceived levels doesn't make sense to me. Shed that macc light, if you will?
I'm not macc - but it's basically down to making a fair comparison. You want to see if your channel sounds better with an effect, but the effect also makes the channel louder. More often than not, louder sounds better, so switching on the effect makes you think it's giving your channel loads of punch, energy, body, profit. Instead, it's actually just making it louder and shittier. It's best to keep the effect at an output level so that it sounds like it's running at the same level as when it's bypassed, so you can really compare the two sounds properly.
This is why it frustrates me (though I understand why they'd do it!) when ME houses upload "before/after" clips where the before clip is peaking at -10dB and the after clip has an RMS of -5. Of course the "after" clip is gonna sound like it has more energy - at that level it does! What would be better would be to match the perceived levels, and judge: a) whether the ME has made it sound better than the original in terms of frequency response, balance etc, and b) to what extent the ME has sacrificed dynamic range and introduced distortion for the sake of making it louder. In order to judge b), you have to listen to the "after" clip at such a volume that there is no difference in "loudness".
BTW, for the most part, peak level on its own isn't really all that meaningful a quantity. Sure, you can relate it to attack, punch, dynamic range etc, but the main reason we care about it is because it can't exceed 0dB at the end of the chain. In terms of "how loud is this", it doesn't really mean that much. For example, a square wave peaking at -10dB will sound a hell of a lot louder than a sine peaking at -10dB, not only because of Felcher Munt-on, but because it's got a much higher RMS.