What are the smallest speakers that are clean and flat down to 20hz?

Goldenear Triton Two+.  Plays flat to 16 Hz.  Smallest speaker I've seen that goes that low.  Two powered oval drivers and 4 passive radiators I believe.

BTW Triton three plays to 21 - but you said 20...so the Two+ is my answer.

Of course there is always the *quality* of the bass to be considered. It's not simply a question of frequency response.

His question stated "smallest" that plays to 20 Hz.

I’ll grant you that 48" is a tall speaker...it also has some depth but it is a narrow speaker.

Lets have some fun here: Name me a pair of speakers (no subs allowed) that play to 20 Hz that are smaller than Triton Two+. Bonus if they go to 16.

We'll use area (LxWxH) as the "smallest" deciding factor.