Which is better: Spendor BC1, SP1/2, or SP2/3.

If you can get mint BC1s, they had a magical sound that was somewhat lost with the following iterations, SP1s and the rest. They also had a slightly underdamped bass that modern amplifiers would have no problem with. Lots of warm bass and clarity but volume limited.

Personnaly, i've just bought a pair of BC1, at first, i tought too much base and unprecise, than i've built a speaker stand with rosewood/pine/rosewood with pike.

Then magical appear, it was/is like the band is in my place, never heard a warm speaker like that before, except in the 80's when i was a student. I've own a pair of Tannoy mercury than a Tannoy Jupiter. There's something spécial in those speaker that took me over 20 years to find back! But what a result!

BC1 defetely an absolute, espacialy if you enjoy small band music(Jazz or Folk).

Has anyone compared the BC1 with the B&W DM2 from the same era?

Both have the same top end with Goodmans tweeter and Coles super-tweeter but the bass/mids driver differs as well as the cabinet which in the DM2 is an acoustic line design whereas in the BC1 is ported.

The SP1/2 and the SP1/2R2 are different animals. R2 is brighter.

For your room, given you have SP3/5s, I think the SP2/3 would be a nice fit. I have SP2/2 and heard the 3 a few times to know they have better bass control and more detail.