Best Late Night Low Volume Speaker

Harbeth SHL5 that I owned were fine but the Living Voice OBX-RW that I own now are much more resolved and balanced at low level listening.

I FACE my panels at one another and sit between 'em.
It's like wearing 'ear speakers', but without anything clamped to my head.
Maggie Magic is alive and well even at 0-dark thirty is a quiet house.

Quads. IME, I disagree with the Harbeth recommendations.

I use my Merrill single drivers all day long as computer speakers. Great with low level listening. The other advantage of small single driver speakers is there really is a lack of bass to disturb others at night.

There is no such thing as magical late night, low level listening with speakers. All systems have a volume where they really start to shine and it is not at a low volume. Headphones may be what you need or for whoever you are inquiring for.