
If you want MP3 without audible degradation for most listeners, start with a modern encoder in VBR quality mode and choose a setting equivalent to LAME -V2 (~190 kbps average); move up to -V0 (~245 kbps) only if you can prove you hear artifacts in a blind test on your own music. Beyond that, bigger numbers usually buy peace of mind, not reliably better sound. (wiki.hydrogenaudio.org)
What “no audible degradation” actually means in practice
With lossy audio, “no audible degradation” means transparency: you can’t reliably tell the MP3 apart from the original under controlled listening. That’s not a promise a bitrate can make for everyone, because it depends on (1) the music, (2) your ears, and (3) how you listen. The practical goal is to pick a bitrate where any differences are rare enough that you’ll never notice them in normal use—and then confirm with a quick reality check on the few tracks most likely to break. (wiki.hydrogenaudio.org)
Why bitrate is the wrong knob (and why you still have to turn it)
MP3 is built from short chunks (“frames”). If every frame uses the same bitrate, that’s constant bitrate (CBR). If the encoder can spend more bits on hard moments (dense cymbals, wide stereo reverb tails) and fewer bits on easy moments (solo voice, sustained tones), that’s variable bitrate (VBR). For choosing “no audible degradation,” VBR is usually the more direct tool because you’re targeting quality rather than forcing a uniform number everywhere. (wiki.hydrogenaudio.org)
That’s why you’ll often see recommendations expressed as quality levels (like -V2) instead of “always 192 kbps.” A VBR file might average ~190 kbps and still spike higher when the music demands it. (wiki.hydrogenaudio.org)
A simple decision rule that works surprisingly well
Use this as a default if you do not want to overthink it:
- Default for music (most people, most libraries): VBR around
-V2(~190 kbps). - If you listen in quiet, on good headphones, and you’re picky:
-V1(~225 kbps) or-V0(~245 kbps). - If storage doesn’t matter and you just want a ceiling: 320 kbps CBR is an option, but it’s not automatically “more transparent” than top VBR settings. (wiki.hydrogenaudio.org)
This isn’t a guess pulled from vibes; it reflects long-running community testing culture around ABX and the practical limits of what MP3 can do when well-encoded. (wiki.hydrogenaudio.org)
When you should not trust the default
Even good defaults fail on predictable edge cases. You’re more likely to hear MP3 artifacts when the source contains:
- “Swishy” high frequencies: cymbals, hi-hats, brushed percussion, bright reverb tails
- Dense mixes with constant shimmer: distorted guitars + cymbals + wide stereo synth pads
- Sharp transients: castanets, claps, certain snare samples
- Stereo stress: wide ambience, phasey effects, choruses that smear across channels
If your library is heavy on these, you’re not doomed—you just have more reason to validate -V2 and possibly bump to -V1/-V0.
Don’t pick a bitrate—pick a workflow
The fastest way to choose “without audible degradation” is not to debate numbers; it’s to adopt a repeatable test that takes 10 minutes once.
Step 1: Encode at -V2 first
Start with the setting that’s designed to be “usually transparent” at a reasonable size. In the LAME world, that’s commonly -V2 (often called “standard” in preset terminology). (wiki.hydrogenaudio.org)
Step 2: Identify your “problem 10 seconds”
Pick 3–5 tracks you know well, then find a 10–20 second segment with one of the risk factors above (cymbal wash, reverb tail, busy chorus). The point is to stress the encoder, not to average out the easy parts.
Step 3: Run a quick ABX (so you don’t fool yourself)
Human hearing is extremely suggestible. If you expect 320 to sound better, your brain will happily comply.
Use an ABX tool that hides which file is which and asks you to identify X as A or B across repeated trials. foobar2000’s ABX Comparator exists specifically for this. If you can’t score above chance, treat the setting as transparent for you on that material. (foobar2000.org)
Step 4: Only then move up
If you do reliably detect artifacts at -V2, step up one notch:
- Try
-V1, re-test the same segment. - If needed, try
-V0.
Stop as soon as you can no longer ABX the difference. That is your personal “no audible degradation” point. (wiki.hydrogenaudio.org)
VBR vs CBR: what choice actually changes audibility
If your goal is “same perceived quality, smallest file,” VBR is a natural fit: it allocates bits where they matter most. Hydrogenaudio’s LAME guidance explicitly frames VBR as the mode to use when you want a fixed quality level using the lowest possible bitrate. (wiki.hydrogenaudio.org)
CBR’s main advantage is predictability (and compatibility in niche situations). If you’re not constrained by streaming or legacy playback requirements, CBR mostly makes you pay for bits you don’t always need. (wiki.hydrogenaudio.org)
What “~190 kbps” hides (and why it matters)
When people say “-V2 is ~190 kbps,” that’s an average. Your actual results will vary by content:
- Sparse acoustic recordings may land lower.
- Dense electronic or metal may land higher.
- Some passages may hit much higher instantaneous bitrate even if the average stays modest.
This is exactly why VBR can hit transparency at lower average bitrate than a naive “always 192” approach: it’s spending intelligently, not evenly. (wiki.hydrogenaudio.org)
Common mistakes that make a “good bitrate” sound bad
These aren’t side quests—they directly impact whether you’ll hear degradation.
Re-encoding MP3s
If the source is already MP3 (or any lossy format), re-encoding compounds losses. No bitrate choice fully fixes “lossy-to-lossy” damage. If you care about transparency, encode from the original lossless/CD source once, and keep that as the master. (This is a workflow point, not a format debate.) (wiki.hydrogenaudio.org)
Using a random encoder default
Different programs expose MP3 settings differently (“Good Quality,” “High Quality,” sliders). If your app supports VBR and a quality scale, use that instead of guessing a fixed bitrate. Apple’s own guidance, for example, describes VBR as varying bits with music complexity to keep size down for a given outcome. (Apple Támogatás)
Treating 320 CBR as a guarantee
320 CBR is “maximum bitrate,” not “maximum transparency.” The most useful question is whether you can ABX it against -V0/-V2 on your problem segments. The Hydrogenaudio LAME page even notes that higher-than-top-VBR settings haven’t been shown (via ABX) to be perceptually better than the highest VBR profiles. (wiki.hydrogenaudio.org)
Quick presets you can copy without thinking about math
If your encoder uses LAME-like presets/flags, these are the practical picks:
- Everyday “transparent enough” for most music:
-V2 - Conservative for quiet listening / better headphones:
-V1or-V0 - If you must use CBR:
-b 320(but don’t assume it’s audibly superior)
LAME’s own usage documentation maps classic preset names to these settings (e.g., “standard” ≈ -V2, “extreme” ≈ -V0). (GitHub)
Why does this matter
Once an MP3 is transparent, raising bitrate mostly increases file size without improving your listening. A deliberate bitrate choice also prevents “upgrade churn” later—re-ripping, re-tagging, and re-uploading a library because you picked a number out of habit instead of evidence.
Sources
- Hydrogenaudio Knowledgebase: LAME (recommended settings and typical bitrates) (wiki.hydrogenaudio.org)
- LAME Project: official site (lame.sourceforge.io)
- LAME Project (GitHub): USAGE file (preset mappings like standard=
-V2, extreme=-V0) (GitHub) - foobar2000 ABX Comparator (official component page) (foobar2000.org)
- Apple Support: MP3 import settings and VBR option in iTunes (Apple Támogatás)





