The A-100 started out as a small integrated amp for driving speakers (the original Mini-X A-100 didn;t even have a headphone output).
When it became clear that people were using "speaker amps" (including the A-100) to run certain low efficiency planar headphones...
As well as certain high impedance headphones that need a lot of voltage...
And that many people preferred the way a lot of vintage equipment sounded (running their headphones from the main outputs via dropping resistors)...
We made a few modifications to allow the A-100 to fulfill those particular requirements.
As I said, I don't have all the details yet, but the new amp is going to be more like a "traditional high-end headphone amp".
It will have quite a lot of power - but not as much as the A-100 (it won't be designed to handle speakers).
I expect it to have adjustable or selectable gain, balanced and unbalanced outputs, and be able to drive any current planars and high impedance phones really well.
It will also be quiet enough to drive high-efficiency IEMs (and normal headphones) very well.
(Most modern planar headphones, while they benefit from a powerful amplifier, don't require as much power as certain few early "super inefficient" models.)
Thanks for the info Keith. One more question: When this amp come out will it replace A100 as the go-to planar amp? And if so will it be quiet enough for IEMs (assuming it has adjustable gain)?
Seems like you guys have your guns pointed directly at Jotunheim, which I'm not a fan of.