I have tested the Coles 4001G on their own on both the B&W DM2 and DM4 and I can well hear them going. I'm 40 so I don't expect to loose my hearing in 5 years time, at least I hope so lol.
I gave up on the idea of having a SP1044 to replace the 6171 version of the KEF B130 which is larger and it would have made more complicated.
Regarding the input terminals I was thinking to replace them however I don't want to get banana jacks as this would imply too much hassle and would have to do a cut-out to mount the plastic box at the back which is just too much work.
I could also just stick banana jack terminals in the existing holes that I don't want to have them stick out so my thought is to buy copper bolts, screws and washers and keep the back flush maintaining the same design and as you say its originality.
I did some math on the economics of it and 4 pairs of copper screw with washers and nuts would cost me £20 however they only come in packs of 10 each from China. I was thinking I could order 10 or 20 and sell the other pairs back on eBay.
Now coming back to mounting the Coles I had a second look at the crossover and noticed in a corner HF2+ / HF-.
Turns out the Radford "Monitor" model shares the same crossover with the bigger brother model "Studio" which employs a Telephones Supertweeter 16ohm.
By the looks of it the only missing pieces I need to add to the existing crossover are a 0,47μF capacitor and an inductor to which I don't know the value. Any idea what μH inductor I would need? The DM4 crossover uses a 0.200mH before the Coles 4001G whereas the DM2 uses 0.3mH
In regards to positioning, my plan is to remove the mids driver, patch the hole and then reposition it further to the side so I can fit the Coles in the middle. They will be quite close packed.
I've made a side by side comparison of the two Radford FN7/5 showing them side by side.Untitled copy.jpgUntitled copy_2.jpg