Audio-Technica ATH-A990Z headphone, JBL E 80 Speakers with Burson V6 Vivid Opamps
Better nice and bright sound than original opamps.
Harman Kardon SoundSticks III 2.1 Speaker System, EPOS I Sennheiser GSP 600 – Wired Closed Acoustic Gaming Headset with Burson V5i Opamp
I purchased the V5i OP-AMPS for my EVGA NU Audio Pro sound card. The OP-AMP replacement was really easy. The resulting sound, while not yet broken in, is already incredible! The soundstage width and all levels of sound have been enhanced quite a bit over the default OP-AMPS. Thanks for such an incredible, inexpensive product!