QRV-07 - The ultra high performance SMD headphone amplifier Click on the picture to see a larger view of the pcb. The performance is outrageous in headphone amp terms. See the technical data! Interest...

QRV-06 The Current Feedback Headphone Amplifier with SMD Diamond Buffer Click on the pictures to get a larger view. The performance is very good. See the technical data ! Interesting features: Extreme...

QRV-05 - The high performance SMD Diamond buffer The component side and also solder side. The component print The performance is very good. See the technical data! Interesting features: The pcb fits v...