Evening all. I am pretty new to the Stax world after buying a pair of SR-Lambda/SRD-7 (yes, the antiques from the '80s) a few months ago. Unfortunately, they've somewhat languished in my living room system. Sure, I had an amp there to drive them, but no chair to sit in. Recently several things have changed and now they're getting used frequently. First, my missus bought new furniture for one room and rearranged another. So now I have a corner in one room suitable for head phone enjoyment. I was also able to treat myself to another amp for my new head phone corner, a Schiit Aegir.
I listened using the analog output from my DAP -> Aegir -> SRD-7/ SR-Lambda for a week or two. My only real complaint was bass weight. I'd had that trouble before in my bedroom system. Since that gear doesn't get as much use as it should, I pirated my DAC and brought it out front as well.
So now I am currently enjoying the USB out from my DAP -> Bifrost I multi-bit -> Sys -> SRD-7/ SR-Lambda. As with my bed room system, the Bifrost provides a solid foundation for the music. Bass is deep and punchy and solid. Extreme highs are always lightning fast with my SR-Lambda, but they can also be sweet and delicate, Bifrost allows that to happen.
As somebody recently posted, my Aegir is loafing driving my SR-Lambdas, I keep the volume of the Sys around 9:00 most of the time. As the other poster mused, I agree having the current delivery capability and the head room are the important things.
I am thoroughly enjoying this introduction to electrostatic head phones. I also get to "scratch and itch" I've had since high school when these particular head phones were introduced. It's all good.