For "silent" headphones, you will need in-ear monitors like those from Etymotic or Shure or others. These can range in price from about $125 to nearly $1000.00 Ety 4s would be mid price but are pretty decent quality. Ety 6 would be mid-fi. Source is same as any other rig. HP amps cover an entire spectrum, tube and ss, with many diff sound signatures. SS units include Headroom Home and Max. Ray Samuels SS units are also well reviewed. Tube units include those from Singlepower and RKV at the high end, Melos SHA (pre) with NOS tubes has a well regarded HP jack and is a pretty worthy contender that can serve double duty. There are 2 web sites that focus entirely on this subject, head-fi.org and headwize.com. Good luck. BTW, best HP rigs I have heard and owned) are not contenders because they are open design.
