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

Meadowlark Kestrals and Vandersteen 1?

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