Hi I'm looking for some advice as I am not sure about preamps and such, I would like to get 2 things to help her get the most out of the 2.1 setup I bought her. Firstly at the moment its hooked up from her laptops headphone jack to a lepai 40w peak 2 channel amp into a Polk PSW-10 sub through the line level inputs to a pair of Dayton audio T652 towers. I want to get a proper USB DAC and a preamp to the lepai and remove the sub from line level inputs and use a RCA LFE channel. I'm looking for something that can decode 24 bit audio and also be able to use a EQ to tweak the sound to remove some of the top end sheen and some of the bass to make it easier listening and allow her to comfortably turn it to a good volume.
Any suggestions for a good USB DAC and a good Preamp around 300$ max for both would be appreciated.