Just replaced the 3 dual-opamps on my Asus Xonar STX sound card.  Replaced 2 JRC2114s (in the I/V section) with a pair of matched Burson opamps, and one more LM4562 (in the buffer position) too.

The sounds have really opened up with further extension in the top AND bottom.

Great stuff! Have taken a whole bunch of pics, before and after installation!