In my very first blog post I briefly bashed MP3 as an inferior format for tone deaf plebes. I soon realized that was an extremely hypocritical thing to do, as the majority of my music collection resides on my laptop and iPod in either AAC or MP3. But whenever I listen to these formats, I’m usually doing something else at the same time: riding the bus or subway, walking to class, fidgeting in an uncomfortable airline seat, or hunched over my laptop surfing the internet. I reserve my “critical listening” sessions for vinyl, CD and SACD and so I had never sat down and really listened to MP3s. As far as I know, MP3 sounds pretty damn good when piped into a hi-fi setup but I was just going off the standard snobbery and assuming that it sucks.
So, I decided to plug my laptop into my amplifier and give some tracks a good analysis. I had done this before in my previous apartment, but again I never had a chance to critically regard it since it was usually done during parties. To do this, I bought a cheap 3.5mm to L+R RCA adapter much like this one
It’s important to first briefly summarize bitrate: basically, higher bitrates translate to better sound quality. The most common bitrate seems to be 128 kbit/s ; this is what you’ll likely find on filesharing networks unless otherwise specified. By default, iTunes rips CDs to 256 kbit/s AAC format, and the same goes for stuff downloaded from the iTunes Store.
Now that i’m plugged in, I try a few selections:
The Chameleons – What Does Anything Mean? Basically (224 kbit/s MP3) : This layered, atmospheric post-punk/goth really suffers from the MP3 encoding. It sounds as though the music is struggling to escape the speakers, and this tires out my ears because I have to force myself to focus and interpolate what i’m supposed to be hearing. Turning up the bass knob on my amp filled out the bottom end a bit, but I really don’t like to play with the tone controls if I can help it.
Catherine Wheel – Chrome (160 kbit/s MP3) : A slight improvement, but the music still lacks any sort of punch or edge. This might be blamed on the album’s production; shoegaze bands liked to go for the muddy, distant sound.
J.S. Bach – Brandenburg Concertos, Benjamin Britten: English Chamber Orchestra (256 kbit/s AAC) : This is one of the better selections so far. The music actually has life and presence, although the violins lack attack/decay. Could this improvement be a property of the AAC encoding?
Dave Brubeck Quartet – Jazz Goes to College (141 kbit/s MP3) : First off, this is a live concert recording, so the overall acoustics will differ from something taped in studio. Nevertheless, this actually sounds fairly musical and I would say is the best set of MP3s i’ve sampled so far. The sax and piano are smooth and feel as though they are in a concert hall like they should. However, like all the tracks i’ve tested, the bass is disappointing and there is still that lack of thrust and definition that I like to hear (Additionally, a minor gripe: the applause and whistles of the audience don’t feel “live” either).
Now there are some flaws in this experiment that I’ll readily admit:
1. This is an entirely subjective test. I didn’t take any actual measurements of the sound output (such as level or frequencies), although I kept the volume the same.
2. The output level of my MacBook is probably less powerful than other sources, thus giving the amplifier less to work with. An MP3 player might give different results.
3. I didn’t do any sort of A/B comparison between the same recording on a different source like CD or vinyl. This is why in Part 2 of this article I intend to listen to Van Cliburn performing Beethovens Emperor Concerto
In the meantime, I can say this about MP3s : They clearly have a lot of advantages, in that they’re , uh, “free” and they take up very little space on your hard drive. And despite that they aren’t a hi-fi medium, i’m willing to bet that most of my readers have a substantial amount of their music in this format. To take advantage of this, and to get the best sound possible, hook your MP3 player into an amplifier + speaker combo. By simple virtue of playing through actual speakers and not earbuds or a cheap docking station, you will reveal details that you wouldn’t have noticed before. For example, Kitchens of Distinction’s Love is Hell was an album that I had only listened to on my iPod, so when tried it through my system it revealed details like fuller chorus guitar effects.
If you want to get your feet wet with hi-fi, get yourself a setup like the one I recommend and plug in your computer or MP3 player. You’ll get a taste of good sound while keeping your current collection, and I have no doubt that it will inspire you to do more with your system.
For further reading, Stereophile has a good article about the difference between various audio compression formats.
