I tried both the SR007s and SR009s on a Woo Wes. The SR007s sounded great, but the SR009 sounded over-the-top with upper mids and lower highs, especially on vocals and strings, that had me cringing. The bass was full and staging was good though.
But I much prefer my SR009s on my 007t/ii amp, and even more so with it retubed with the RCA cleartops. It is intimate, balanced, and has incredible non-hyped detail, and the highs are sweet and easy to take, which is just what the SR009 needs.
Since I much prefer the SR009 to the SR007, the 009/007t-ii chain works for me, and is quite affordable too.
It's also nice that the Stax amp does not generate loads of heat, tubes and all, which is great if you are sitting next to it in a desktop situation.
The bass I am hearing is at least as prominent and tight and definitely more detailed and natural than my Senn HD800 (with a Pinnacle), so I am happy.
(I have not heard a BHSE or KGSS yet, so I cannot comment on them.)
Edited by rgs9200m - 9/3/14 at 6:44am