Here's a site where TripleFi10 is measured with a lot of players/amps.
http://www.markuskraus.com/RMAA/rmaa%20complete%20-%20html.html
It's clear that the frequency responce really depends from source to source.
Depending on your source, you might not need an amp and if you still want one, check out which amp has the flattest response.
There are however many good amps, depending on your budget, sound you are looking for,... choices are almost unlimited.
