Equalizing is the carving of frequencies to mix and fix any conflicting parts in a song. Even though equalizing is a necessary part of audio engineering and producing, it can be overused and cut out too much of the “meat” in a mix.
High Pass Filters
HP Filtering is when you are working with instruments in mid to high frequency range. This means instruments other than the bass, sub, and kick. However, when mixing your songs the best thing to do is to go by ear. The filters are for tracks that focus on frequencies above 200-250hz.
Why HP-filter your song?
When HP-filtering, you don’t want to take all the natural sounds from the song. That gives you a bland sound when mastering. This means when High Passing you should aim to take no more than 12dB per octave and around 25-40Hz. It is always a good idea to use visual aids when high passing.
High Passing the whole with a resonant High Pass filter is a great way to help boost the sub; making it more firm. According to the song, it is good to raise the frequencies around 40 Hz. Be careful to not raise it too much so you don’t loose sound in other parts of the song.
Low Pass Filter
Low pass filters are to remove high frequencies from a track. They’re more for bass instruments and drums. They also give more room to the high end of the frequency band. On the contrary, low pass filters focus on frequencies below 250hz.
You never want to carve out too many decibels of any track. Too much EQ can ruin your mix and take out a lot of the important parts that give it thickness.