Good AAC can beat good MP3 at the same bitrate for most content, but honestly the encoder used matters as much as the format. Good MP3 (VBR or CBR with a good codec, and high enough bitrate) will sound darn good. The problem with this was both BAD INTELLIGENCE - early codecs that would turn it down when it needed more bits, and also users setting too low of average. Good idea, turn down the bitrate during silence, turn it up during the most complex parts, keep the average lower. Rather than sounding BETTER, joint stereo encodings sounded worse and sometimes lost some of their stereo separation as well. Joint stereo got a bad rap though? Why - because the encoders didn't live up to the promise of joint stereo. During primarily mono portions, a 128kbps joint stereo MP3 would be ONE 128kbps channel instead of two identical 64kbps channels. The idea being most of the main vocals, etc - and sometimes the whole track - is all centered (mono mix). Joint stereo is a method to record a higher bitrate center, and lower bitrate differences between channels. The codecs used are sometimes terrible, much of the MP3 content on pirated networks has been re-encoded multiple times, etc.Īnother issue is bad joint stereo and VBR implementations. 48KHz is often used in studio work, yes, but CD's are 44.1 and telling the difference is VERY difficult and only possible with some types of content. And the sampling rate of most MP3's out there is just fine - 44.1KHz, which makes for 22.05KHz as the highest recordable frequency.
Apple screwed up AAC really badly when they first started using it with a really bad codec. Sometimes through a DI box into an XLR for a long run, or a pair of DI boxes to keep it stereo.ĪAC was never terrible.
No complaints about the sound quality on my behalf. I can tell you I run right off the headphone jack of my iPad ALL THE TIME at live events, concerts, DJing, etc. Agreed, Apple actually uses really very decent low-noise low-distortion DAC's.
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