Unforgiving DAC or add Tube Preamp??


I have added a (Benchmark HGC 2 DAC) to run digital music to my Modwright KWA 150 SE.  At first I was impressed with the detail but much of my music sounds more harsh than what my ears are used to.  Apparently Benchmark DACS  are known to be unforgiving.  Should I look towards a different DAC or would adding a Tube Preamp be the best solution? Or change both? Recommendations welcomed!

Speakers : Dali Euphonia MS4
(#2) Rel 528 in stereo
puffbojie
itsjustme

The Apple TV is going to the Benchmark DAC however it is an optical cable not a spdif.  Some folks say going a BlueSound Node 2i over ATV will help.  Others say it makes no difference.
I use Dac ,for streaming ,of the Luxman sacd D-06, as preamp:Audio Note M5 (tube),combinated with Gamut D200. My best friend, use Dac,preamp,poweramp Ear 868.Beautiful !! We use as streamer:Logitech. Cables are here very important! 
I think Apple TV is 48KHz 16 bit. This means it must sample rate convert everything that is in an audio format (48KHz isn’t used for audio alone) and many think the conversion is poorly done. This is definitely the weak link in your setup.
Audio Note Kits. DAC 3.1. I am surprised AN has not been mentioned. Its crazy how good it sounds. I speak from experience as I have one and have gone through several 2500.00 Dig DAC's. I had it paired to a Bryston pre until I got the AN 3M line pre. The DAC was the biggest improvement made to my system. Even more than the AN tube pre.
I think the high sampling or low sampling is not the issue in other words bits so bits,in my own opinion the best digital format is 16bit 44.1khz cd standard but in other hand digital lossless w high bits high sampling is better sound because is lossless no high compress information or moving parts, compare 1cd album vs 1 digital lossless album and you can hear the results.