see thsi Digital Audio: The Line Between Audiophiles and Audiofools

Audio

Frequency Range Of Human Hearing: 20HZ - 20,000HZ

Low Frequency Range Test (10-200 Hz) High Frequency Range Test (8-22 kHz)

Noise level

See this

Painful impulse noise—Not safe for any period of time 150 dBP = fireworks at 3 feet, firecracker, shotgun 140 dBP = firearms Painful steady noise—Not safe for any period of time 130 dBA = jackhammer 120 dBA = jet plane takeoff, siren, pneumatic drill Extremely loud—Dangerous to hearing; wear earplugs or earmuffs 112 dBA = maximum output of some MP3 players, rock concert, chainsaw 106 dBA = gas leaf blower, snow blower 100 dBA = tractor, listening with earphones 94 dBA = hair dryer, kitchen blender, food processor Very loud—Dangerous to hearing; wear earplugs or earmuffs 91 dBA = subway, passing motorcycle, gas mower Moderate—Safe listening for any time period 70 dBA = group conversation, vacuum cleaner, alarm clock 60 dBA = typical conversation, dishwasher, clothes dryer 50 dBA = moderate rainfall 40 dBA = quiet room Faint—Safe listening for any time period 30 dBA = whisper, quiet library

Compression

Non Compression audio or Linear PCM has Bit Rate of 1,411 kbps.

Example:

  • WAV

Lossless

This is good will keep the original quality of the audio.

Example:

  • Apple Lossless (ALAC - Apple Lossless Audio Codec)
  • Free Lossless Audio Codec (FLAC)

Lossy

This is bad. It will loss some quality of the audio

  • MP3
  • Advanced Audio Coding (AAC)
  • Windows Media Audio (WMA)

both Lossless and Lossy

Some audio formats feature a combination of a lossy format and a lossless correction; this allows stripping the correction to easily obtain a lossy file.

Recommendations

settings

on Mac use this app Audio MIDI Setup

  • 2 ch, 16-bit, 44.1kHz (16-bit for listen and 24-bit for record)
    • CD quality -> 16-bit, 44.1kHz
    • Hi-Res quality -> 24-bit, 96kHz or greater. Stick with CD quality

Ref * list of codecs