JackIir
A frequency equalization digital sound processor written in Java. This is the JackIir project ported to Java without built-in Jack connectivity. (https://github.com/adiblol/jackiir) However, audio is processed as +/-1 floating point arrays in the manner of Jack. (https://jackaudio.org/)
To connect to Jack using Java, use JNAJack. (https://github.com/jaudiolibs/jnajack)
Default settings create a Low-Mid-High 3-band equalizer.