Upgraded my TD-2001 to TD-4001 with a “little” e-lmlc 300 horn… bulding a new bass cabinet. Best sound ever in my room 
CX at 600hz. 2 way rules the world
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Duh. PBN 2!5 here.
Hello. Out of curiosity, what is the opening at the bottom of the bass enclosure? It seems like an enclosure with a tweeter, but upside down.
It is what it seems… i just added a 4001 on top and put it upside down. I’ll make a diy bass cabinet soon
I am still confused about this: you have a tweeter on top behind the horn and another one on the bottom?
No sorry, i replaced one for another. Still have the bottom horn without driver.
Wow, when you CAN this is really good.
That’s what a lot of people say… But there are not many CDs able to reach from 600 to 20k with such a low distortion and linearity. TAD TD-4001 are such a wonderful creation. Also active filtering make the job quite easy
Those are 10cm beryllium drivers! It will be hard to find a large woofer with low distortion. Only a particular 15” Celestion might cope up with that, but I am not sure it will go down below 40 Hz.