I was hoping for some input on what you guys use for low budget amps/dac's for headphones. Right now I am using a tascam us-122 audio interface, but there is a serious issue with a random bitcrushing noise that lasts for a few seconds. It's a driver issue, but I don't think anyone has came up with a solution. I am looking for something around $100, decent sound and decent amplification, nothing too fancy. Fiio comes to mind. My headphones are Sennheiser hd-598's and Phillips SPH-9500's.