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Budget $2-300. I'm looking for something to use when spouse has gone to bed and not have to turn the sound down below my normal levels. So, I'm looking for similar sound from my Fritz speakers.

As your Fritz are fairly neutral with excellent imaging/soundstage I’d recommend looking at Hifiman open-back planar headphones, and these Ananda Nano headphones are in your price range and not difficult to drive.  Hope this helps. 

https://www.amazon.com/HIFIMAN-Open-Back-Headphones-Nanometer-Thickness/dp/B0C5SNQ47V

Also in your price range is the Fiio FT-1 Pro planar magnetic headphones. (Don't confuse them with the "regular" FT-1, which is a dynamic model).