Dunlavy SC-VI

I use the SigTech (and have a Tact) on VI's. SigTech is better and Tact cost less. If you can afford the best (which, given your speaker choice appears you can) go for the SigTech.

I use Dunlavy cables

I suspect the dip was between 32 and 45 Hz. One of the advantages of the SigTech (or the TAct in this case) is to carefully move the speakers and listening position and remeasure until you can reduce the amplitude of the dip in the low end.

I had the exact same problem (I use a SigTech, and was able to get the dip to about 5db by moving stuff around. The SigTech would fix it all but I chose to only fix part of it (modified the target curve).

Having Dunlavy send you measurements is not going to solve the problem.

Because the design parameters are the same, they (V's and VI's) are very similar. The VI's don't really go any lower than the V's (at least in a normal room) but because of the radiating area of the bass drivers, they have more weight to the bottom end.

That does not mean that have increased bass amplitude. It means they move more air and so sound more like what bass does in a concert hall in terms of compressing the air in the room. In addition, because each of the drivers is larger than the counterpart in the V (except the tweeter), the VI's are more relaxed at greater volumes.

If you have the right room (and the money) I believe the VI's to be the better speaker. But given the V's are about half the price of VI's, (and 98% of the speaker)the V is the better buy. ....by a long shot !!!