2 Ohm Tekton Pendragons

First of all, kudos for Tekton, for calling them out what they are, 2 ohms! Finally, a company who is honest about ratings. (Instead of the "4R with dips below 2R" pure BS advertising - it's either 4R or 2R... impedance is defined by the lowest dip, not a random convenient number.)
That being said, here's what not being said:When speaker impedance is halved, the speaker cable has to carry TWICE the current for equal output. That is, you are effectively cutting the speaker cable down by 3 gauges with every halving of impedance. Thus, a 2R speaker needs x8 the current as a 16R speaker does. Hence, you need x8 THICKER speaker cable to get equivalent results! So, if you have AWG10 speaker cable fro your 16R speakers, then you need a total of AWG1 speaker cable to get equivalent bass performance as said 16R speakers.With my 16R speakers I can tell a massive difference between AWG12 and AWG10 speaker cables. (Hey, I'm bi-cabling with two AWG10 runs!!!)
So, not only does the speaker become impossible to drive as impedance drops, but your cable also degrades exponentially.
To have GREAT bass from 2R speakers, you will need 8 runs of AWG10 speaker cables to feed it...  or, if you want to simulate my setup in a 2R scenario, then it's 16 pairs of cables! (Total AWG00!!!!)
That will cost way more than the speakers do. Plus, you need that heavy internal wiring as well. NOT possible to hook up that much to the drivers tiny connectors....

Common example: you have an AWG12 speaker cable, which functions as AWG12 for a 16R speaker. You connect it to a 2R speaker, it will function as an AWG21 cable would for a 16R speaker!!! A mere fraction of a lamp cord. Makes for terrible bass control.  

Thus, a 2R speaker needs x8 the current as a 16R speaker does.

For the same output power it needs only x2.83 current.  Same goes for wire thickness calculations.

Lot of people for sale these right now on these sites. What the matter they no good? Seem cheap to look at maybe that’s problem.

Also, wire has very little to with do bass control (damping). For back EMF resistance of the speaker is already in series. Because of that 2 ohm speaker may have same damping as 8 ohm.

@speakermaster, 
It has been postulated by others on this forum in the past that the  high impedance speaker's decreased manufacturing was due to,
 1 The increasing availability in the 1960s  of transistor amplifiers that made obtaining more watts much less expensive compared to tube power.

2 A good quality high impedance speaker is relatively  more expensive to build and requires more effort.  These 2 factors are said to have led the shift to 4 ohm speakers becoming more popular and the default choice.
Charles