I've heard the 20s with an Exposure integrated amp that sounded very good. Best of luck.
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I have used Older Exposure on System Audio bookshelf speakers and on Vienna Mozart Grands floorstanding.
For what you want Neutral with just a bit of warmth Exposure is exactly want you may want.
Never heard an ATC but always wanted to. I would think as long as the ATC are not very peeky are hot in the treble Exposure would be a good fit for what you are looking for.