Just a minor revision. Taking a look at the schematic for the proposed Tannoy x-over, there's also a 10uF value at the beginning of the signal path, along with a 5.6uF and 20uF across the HF and LF sections, respectively.
The plan is the use the best we have on hand to start with, which includes the 10uF VSF, and continue from there. The small 1.5uF (or so) value will give us a chance to try a wider range of products without breaking the bank, after which we'll have the option of upgrading the larger values with the top performers to further judge the overall effect.
Joe