All,
I apologise for not being attentive

. This morning I read this string for the first time. Being Mr. Mom is quite a pervasive endeavor, but I am happy doing it

.
It... looks like things have been worked out by the general community.
The only additional snippet I would like to add is my subjective comment regarding the bass of the 1801. I generally avoid self aggrandisement, and these comments will reflect this. While it is acceptable and tonally correct, the W18 doesn't have world class bass. On my subjective scale from "1" (terrible) to "10 "(sublime), the W18 is a "5". Bass guitar's are very present, and so is a kick drum. However, neither have excessive slam or articulation. IMO, the SS8545 reamins king of the bass reproduction for all midbass drivers, and this driver will provide much more pleasing results if bass is the nexus of the listener's habits.
Strangely, last week I listened to some Stevie Wonder music on some ACI Jaguar's on very good source gear at a friends home. This system sounded extremely good and I really enjoyed the music. In my youth I spent hours listening to Songs in the Key of Life, and recall the music quite well. On the ACI Jags this music continued to sound profoundly good. The music has funk and drive IMO. Having a speaker that produces better bass is desirable. Certainly the Jag's SS8545 has this.
I also would like to convey some laudatory remarks for Mike D. at ACI. I now fully understand why he has been so successful for so long. The guy can build and design a very competent speaker

. I have heard many loudspeaker implementations using the SS84545, and believe Mike's was the best. I obviously didn't have all of these speakers in the same room for comparison, but to my recollection, Mike's Jaguar 2000 sounded at least marginally better than any of the previous implementations. // I also understand why he no longer sells this speaker (I think?). The jaguar's cabinet construction is extremely complex! Obtaining tightly clamped joints would be very difficult. Minimally, this cabinet would be extremely time consuming. I believe the commercial cost for such a cabinet would easily be double the cost of a decent rectangular cabinet.
Anyhow, back to the original subject.... Thanks to all for your contributions while I was being Mr. Mom.
Dave