Tekton Impact

Lula,
Lacking any auditioning of the Electrons I offer no comparison. From the specifications the Impacts have a higher sensitivity rating, so if you are driving them with an SET amp they would offer an advantage.
Having spent many hours of ultimate enjoyment I consider the Impacts to be the bargain of the century in high end loudspeakers.  Only experiencing them would allow you to ascertain a final purchase.

Powerglide,
Yes, I do have a Dennis Had Inspire SET amp....the Electron's sensitivity rating is only 2 less than the Impact. The latter at around 1.8K may very well be the "bargain of the century".....so back to what is lacking in comparison to the DIs and Electrons (if anything in a small room)? There's also Eric's O.B. Sigma downpriced from 3K to 1.75K, which also received a rave review from Teajay.

Lula,
My best guess on what may be "lacking" in context of your room size would be slightly less quantity of what the DI's  and Electrons would produce, which may be optimal to your desires. The Impacts probably would not overload your room with bass as the other two may. However your final listening tastes and demands must determine these factors.

I just noticed on the Tekton website, the Impacts are listed as weighing 89 pounds.....previously it showed 71 pounds; which is it?

I just checked my boxes and 71 pounds are what mine weigh.