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This is a list of Frequently Asked Questions. The questions are grouped according to their categories, then sorted alphabetically.

Please note that this FAQ provides very short answers; explore the links to get deeper information.

General Audio Compression

Can I increase quality by converting a lossy compressed file to a higher-bitrate lossy compressed file?: Short Answer: This is called Transcoding, and the answer is no.

Does encoding preserves surround info?

Short Answer: Depends. MP3 destroys surround sound information. Go see the page on lossy encoding.

In addition, check the following links:

Experience of a HA Member with Rear Channel on the HA Forums

What is the best audio format?: Short Answer: Depends on your needs.; For a detailed explanation, see Audio format guide.

Why do encoded files get clipped when the original WAVs are not clipped?

Short answer:

Quantization errors may cause the signal to clip, and
Gibbs phenomenon through the limitation of bandwidth may cause the signal to clip.

Check the following links for more details:

Explanation on ff123's site

What is an ABX blind test?

Go see ABX

In addition, check the following links:

Blind Listening Test Explanation on the HA Forums

What is "transparency"?: Go see transparency

Why not use graphs / frequency analysis to compare codecs?

Nothing can be said about quality or audible difference by looking at pictures, because a lossy encoder works by removing as much inaudible sounds as possible. A lack of frequencies can well mean that some audible parts are missing (bad work, or too low setting), or that the encoder managed a very good compression, removing a lot of useless things.

In addition, check the following links:

Lossy encoding
Lossless encoding
frequency analysis
Confusion on CBR & VBR thread on the HA Forums
... and this thread for a more sarcastic discussion.

MP3-related

Why is joint stereo better than pure stereo ?: You better start here (thread on the HA Forums)

Quality

Simple

What do I need to get started?
What is ABX?
Why is ABX needed?

Advanced

What are good test procedures?

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