Ham_authority95 said:
Can you tell me about the supposed "Loudness war" going on in modern audio engineering? Is it just the product of improving sound quality and studio equipment? Or something else?
I was brought to my attention as I was listening to the latest Rush album when I finally though: "Holy shit, newer recordings are LOUD!" This is made even worst considering than I listen to music through headphones most of the time in loud buses and classrooms.
Yes. I'll try and make this explanation as simple as I can, but it's inevitably going to get a bit technical and long-winded.
In the old days, we had analog recordings - bands would go into a studio and record onto a multi-track analog tape machine with a bit fat magnetic tape that stored multiple tracks of music as arrangements of positively or negatively-charged magnetic particles. In the early days only mono (1-track) was possible. Then 2-track or "stereo" was invented where two separate audio signals could be carried on the one tape. It wasn't long before some bright spark, in this case a guy called Les Paul (yes, the same guy who invented the Gibson Les Paul guitar) invented multi-track recordings, where you could have 4, 8, and later 16 and even 32 tracks of music on one tape, all recorded side-by-side. This multi-track tape machine was then "mixed" (levels adjusted, effects added) and then re-recorded or "bounced" onto a big 2-track "master tape". This was then used to cut vinyl records using a process that I don't fully remember but you could look it up on Wikipedia or something.
All sonic analog recording or playback devices (tapes, microphones, amplifiers etc) have something called "headroom". They basically have a recommended volume (usually referred to as "zero", although it's not really no sound, what it represents is the
ideal input signal for that device to preserve both maximum volume and a nice clear sound) , and once you start pushing the device past that volume, then eventually you start to get muddy - the loudness increases but the signal mutates or "distorts", it's not clear anymore. If you're thinking "is that distortion like on an amplifier?" then you're kind of right. If you ever see a distortion pedal marked as an "overdrive" then what it's doing is trying to imitate the kind of "over-driven" result you get from putting a little bit too much signal on a tape machine than what it's designed to hold, or that what an amplifier is designed to produce. Distortion may or may not be desirable depending on what style of music you're recording - Jimi Hendrix famously slashed his speakers so they could produce
less volume before distortion kicked in, hence his well-known saturated, distorted sound. On the other hand classical artists didn't like the sound and tried to avoid it at all costs, because it was considered to sully the "purity" of the music with extra artifacts that are not designed to be there.
Then something happened to the music industry - digital sound. Now, instead of a collection of positively and negatively-charged magnetic particles, music is generally being stored as a collection of ones and zeroes. Analog recordings still exist but they are relatively expensive to make - the digital technology, although arguably it doesn't sound as good, is cheaper and easier to work with, so it's more popular. Digital sound works a little differently. "Digital zero" is different to "analog zero" - going a fraction above analog zero sounds great on rock recordings, the distortion you get is "sweet" and hardly noticeable except to the trained ear. However, exceed digital zero and whoa, Nelly... the sonic result, referred to as "clipping", is very harsh and instantly recognisable, it's generally considered unpleasant and something that studio engineers wish to avoid at all costs. (There are certainly many exceptions to this rule, but few
deliberate ones in any kind of widely-popular mainstream music.) What actually happens when you go over digital zero is that you're exceeding the maximum digit-range that can store your sound. In lieu of being able to process correct information, the digital device either stays at the maximum level (what is known as a "square wave" - harsh to listen to and potentially damaging to speakers) or has a mathematical hissy-fit and just shits itself, doing whatever it wants until things get back to normal.
The "war on loudness" refers to the fact that as time has gone on, more and more engineers, including big names who theoretically should know better, are exceeding digital zero on their master recordings or somewhere else in their signal chains when recording some hotly anticipated artists' new work. This means that some well-known albums have digital clipping in various parts (Metallica's "Death Magnetic" is a notorious recent example).
So if it sounds like shit, why are people doing this? Well, they may simply not be paying attention. Compressors (a studio device that evens out volumes, used often for recording vocals to make them "smoother") are very easy devices to clip if you're not paying attention. More than likely though, the engineers are just trying to push up the master levels of their recordings as close to digital zero as far as they can get them to go... and sometimes they slip over. Why would they want to make the recording louder? Because it grabs more attention. In the world of pop/rock/rap/heavy metal, you sure as hell don't want your brand new CD to be
quieter than the competition, you want it to stand up and be noticed.
I don't consider it a big problem - most people in the industry agree that the war on loudness is kind of dumb, and a skilled engineer who is paying attention to what they're doing can easily check to see that things aren't clipping like they shouldn't be, while still making a pop or metal record nice and loud. Digital clipping on a commercial recording tells me that the person doing the job kind of "phoned it in"...
I hope that answers your question... there's more that I haven't talked about but this is just a basic overview. Let me know if you have further questions about this.