Both are fine. K702 and LCD-2 are not hard to drive, A90 SE outout is fine.
A90 will have better re-sale value, so go for that. A30 Pro has so much power that you will not even need high gain at all.
A90 has pre-amp function, idk if that matters to you.
As someone who has owned that stuff, the HD650 does not need the balanced mode whatsoever.
Even after the negative pre-amp gain of my EQ profile, I had tons of headroom left with the regular SE cable.
If you want to try it for fun, go ahead, but there is zero practical benefit unless you have...
Just chiming to say ou don't need the UMIK-2 if you're only doing in-room measurements, the UMIK-1 is fine.
What have you read/researched so far, in terms of how to do a 2.1 setup?
It's important that you understand what those numbers DON'T tell you.
That number quantifies how flat the speaker measures -in a vacuum, which is a useful metric for sure, but you also have to think of the real-world scenario. There is basically no difference between 6.2 and 6.31 in practice...
Power is the most important measurement, and this amp does not have that much power...
Why not get an NC252 based amp for the same price and get much higher power output at equally-transparent SINAD?
This has to be some kind of elaborate troll. Surely no sensible person actually believes they have a deeper understanding of the long-term durability of driver materials than a reputable company like Genelec, which produces one excellent product after another?
Can you imagine a room full of...
Sennheiser has a slightly strange "house sound" for their IEMs, where they lack upper mids compared to the Harman target, oratory1990's target, and crinacle's target. They're not horrible by any means, but I'd recommend you have a look at this guide: https://crinacle.com/guide/tws/
"Sens will...
Will this heat up as much as the A30 Pro? Maybe not the amp itself since the PS is external, but would the combined heat output of L50 and its power brick be the same as the A30 Pro? I like my A30 Pro but in summer it heats up my desk space too much... A90 is better in this regard.