are there 2-ways that go down flat to around 40?

Meadowlark Kestrals and Vandersteen 1?

Room size, shape and acoustics will have a much greater effect on if you can go flat to 40 than the brand of two way speaker that you use. A friend, in a spare bedroom has Paradigm 20s that are flat to around 38 cycles. In my large living room even the Sonus Faber Extremas won't come close. It's the acoustics, not the speakers at all.

I have the audio physic spark Is.
think it goes down to around 50. it falls off a lot after
that with some output below 40 with some distortion.
it is a narrow,ported floodstander with the port at the
bottom.
phil

Quad 12Ls do 45hz clean...probably closer to 40hz in a small room since this is Quads legendary conservative ratings....the best bass reflex design there is....

the sparks are being driven with a mccormack dna1