voleregard wrote:
The Cat Ghost wrote:
Start around 8k and bring it all the way down to 500hz to see how much high-end you need to roll off to make it play nice with the rest of the song.
Good to know. Is it to filter out noise/distortion?
Noise and distortion is your friend, funnily enough. Well, maybe not noise, but definitely distortion... let's use the audio term "saturation" though. It'll make it easier for me to type out my thought. haha.
I know this isn't exactly answering the question you asked but have you ever played a song on a great-sounding song and then played that same song on a clock radio or tiny portable speakers? If you have, you'll notice that the small speakers have way less bass. This is simply a physics problem, small speakers can't reproduce low frequencies very well. The good news is that we can help the small speakers along by adding "saturation" to the tracks that are likely to lose necessary low end when played on small speakers. What saturation (tube saturation, harmonic exciters, tape saturation, etc) does is enhance the harmonic content of the track, so while on a small speaker you might not be able to hear a low B on a 5-string bass (39Hz, if I remember correctly), adding saturation will enhance the harmonics above the fundamental and our brains will "hear" the low end because our brains are really good at interpreting this type of sensory input.
Take a nicely-muted kik drum, for example. It has two spikes: its fundamental which should be somewhere around 80Hz, and the attack of the beater hitting the drum, usually somewhere around 3-5kHz (depending on the beater material, the drum head, and the size of the drum). If the speaker can't reproduce 80Hz, the kik will sound like it has no body whatsoever and will be all clicky attack. Adding some saturation to the kick will fill out the lower-midrange and will allow the body of the drum to be easily heard on smaller speakers.
Wow, I didn't expect this post to be so long. haha. I tend to over-explain things.
BUT, to actually answer your question, you add a low-pass filter to synthesizers to kind of "push it back" into your mix. Things with little upper-frequency content are heard as being farther away.