MinimServer

MinimServer is written in Java.

MinimServer is available as downloads for Windows x86, Windows x64, Mac OS X, Linux x86 and Linux ARM. There's also a QPKG version for simple installation on QNAP NAS devices.

MinimServer is designed with classical music in mind. The simple and powerful browser interface indexes your music by composer, composition, genre, conductor, orchestra and soloists so that you can explore all aspects of your music collection and quickly find what you're looking for.

It supports transcoding.

Price: freeware

Transcoding

Like all DLNA servers Minim can do transcoding.
It uses FFmpeg to do so.
One of the FFmpeg options is equalizing.
A guy used this option to compensate for bass resonance in his listening room.

Details on the Minim forum.