Anyone have Warfedale Linton 85th anniversary?

I guess it is room dependent.  Take a look at Erin's plots which reveals nothing like that.  Between 40 and 100 hz, the roll off is quite mild and smooth in Erin's in room response.

I didn’t see Erin’s in room response. I saw his spinorama data. There is an estimated in room response. Perhaps he did some, I know he has in the past.

I see what you’re referencing I believe those are taken at 1 meter. My measurement is without any EQ at 3 meters. I did EQ them to be smoother but didn’t notice any difference in sound since I tweaked the bass a bit in my streamer app which I didn't bother to measure. 

His HF start  rising at approximately 5K mine at 10K, he is measuring On Axis I'm not.   Sorry for not adding all that with the original plot. No two are going to look alike. I also have mine close to the front wall. I could seal the ports or move them out and the bass would look completely different.

Thank you for the clarification about your speaker placement. Whereever possible, I will always give speakers room to breath. You probably do not want to seal the (dual) ports based on the Stereophile’s measurement. After sealing the ports (red), the sole woofer (blue) may not perform as smooth as the sum ...

My measurement looks more like Stereophile’s . I only did a few preliminary measurements, my plot is only an average of 2 positions. I’ll get more into when I have time. You’re right I’m not going to plug the ports, I prefer the rise below 200hz if it’s too much I can EQ. I don't have a lot of options for placement.