Hi likedeeler,
I've no idea about the 21kHz low-pass filter in Audacity. It seems that the default preset shows 1000,0 Hz frequency and 6dB roll-of (dB per octave).
I've to confess that i'm not familiar with very fine settings in my audio & recording editor.
This record was made under '"direct source" through the amplifier, without any bass or treble addition. Then the final result came from Audacity.
Anyway, I will be curious to learn more about this setting to provide better audio records in the near future.
Maybe it is possible to equalize this in post production ?
Thanks for any tips
Hi n6! The low-pass is not a problem, I was just curious. Many if not most CDs are mastered with a cut-off (or fade-out) at 20 or 21 kHz.
Generally it's a good idea to keep any "postproduction" at home to an absolute minimum (approximately zero). The actually important factors for good LP rips are in
preproduction:
- record player, pick-up, tone arm,
- cables, connectors,
- power supply,
- phono preamp, amplifier,
- (stand-alone) A/D converter,
- monitor loudspeakers, headphones, (stand-alone) D/A converter,
- no "USB player",
- no computer sound card for A/D or D/A conversion (if you insist on using one it needs to be of the hi-fi variety),
- nothing in the signal path that isn't absolutely necessary -- particularly no "DJ mixer",
- vinyl cleaning (!).
As soon as the sound has been digitised it should be considered immutable. Think "That's the way this record, in this state, with this recording set-up sounded like on this day." If you're not content with the result, try to improve your gear, get an ultrasonic cleaning machine etc. Don't try to fudge it by tampering with the digital files. It regularly leads to disaster -- as evidenced by about 80 to 90 per cent of all vinyl rips floating around.
Except
manually getting rid of the odd pop and click there is simply nothing to improve after digitisation -- it can only get worse. Any dynamic compression, equalisation, automatic de-clicking or de-noising should be anathema. What these tools and techniques really offer the home user is the significant potential to damage the recorded sound.
To get an impression of what is (possibly) involved, consult
Avant Garde Project's description.