Acoustic Elegance Dipole 18 for Stacked Quad ESL-57?

[Tubenstein]

Hello!
My friend is seeking a dipole subwoofer for his stacked ESL-57 and crossover at 80Hz. Is Acoustic Elegance Dipole 18 a good choice?

https://aespeakers.com/shop/dipole/dipole18/

 

[esl 63]

Excellent quality it seemes. Maybe a little pricy. I would go for double Dayton 15", more cost efficient and better form factor.

 

[cab]

In my experience, they will take a year to arrive after ordering, they will rarely answer email and they will never answer the telephone.