Hi! Considering either elac vela bs 403 or dynaudio evoke 20 (I know it's a man vs giant comparison woofer-wise though). Will have to use on isoacoustics stands on a very long and heavy (and good resonance-controlled anyway) rack. Just have to... Room 6x4 and high ceilings 3m. Listening distance adjustible as the rack is long, at least 2.5 m rack). Dynaudios have port plugs and elacs have down-then-back port. Distance to back wall may be 20-30 cm depending on placement and depth. But not more than that sadly. What is the most reasonable choice? Thank you!