Mmm. It may or may not get changed. We compared it to other stock radios (Kenwood & Sony) who both boost the bass slightly in FM compared to CD. Without the boost, FM sounded very flat, and testers complained. It's a first order 6db boost with 125Hz cutoff.

You can try it without boost by modifying arch/arm/special/empeg_dsp.c (search for "bass"). Change the:

dsp_write(X_audioc, 0x2f80);

to

dsp_write(X_audioc, 0x2c00);

Hugo