Is there an amp for Stax SR-009 that can drive also other headphones like TH-900, HD 800, LCD-2, HE-500...?
Seems a bit crazy to buy a 5000$ headphone amp for only one headphones.
Electrostats like SR-009 needs totally different amplifiers and won't be compatible with those dynamics you mentioned.
The closest solution I can think of is to get a really powerful standard headphone amp and using something like a WEE transformer to drive the electrostats as well.
Malvalve is the only company I know of that makes an amp that works with both Stats and Dynamics. Consider though that its likely to be somewhat of a compromise on both though.
Better way to spend $5000:
Electra (Electrostatic amp) - $3500 Pre-order price
Super 7 (Dynamic amp) - $1500 Black Friday special
OP, what you want doesn't exist. If you want stats, you need a stat amp, the cost of which will be significant if you want to do it right.
And for your dynamics, you need a dynamic amp.
These are the realities of owning both types of rigs. It doesn't make economic sense for everyone.
Malvalve max output for electrostatic is only 800Vp-p and for dynamic is only 12W into 8ohms per channel balanced. These seem like major compromises on both sides, and it still costs north of $5500. Combining electrostatic amp and dynamic amp with both of them sounding great is not *impossible.* You just have to convince Justin to stuff BHSE and GSX into one box.