They sound very different from the QUADs, unsurprisingly. More up front, more bass of course, but a little chesty at the moment, but enjoyable.
I have just ordered a Dayton Audio DATS V3 for T/S and impedance measuring, so I can tune the slots. REW will give me the FR measurements. When it's cooler!
They are just plonked down in front of the 2805s until they sell, so moving them back will change the sound anyway. But depth is good even now.