2 Ohm Tekton Pendragons

My guess is that they are choosing to use 2 x 4 ohm mid-woofers, and matching the tweeter impedance to that rather than making a 4 Ohm speaker with 92 dB sensitivity... which would be fine.

Usually we see high efficiency speakers with high impedance as great matches for tubes.  This is not that speaker.  It is instead a very demanding speaker for solid state amplifiers which in the end probably won't give us much more volume, since the max output of most amps is going to be current limited.

Hey there.

So yeah, impedance matters, in big and subtle ways.  Of course, in the big ways, the current draw can overtax an amp or limit the output voltage severely, or just blow it up.

In the subtle ways, impedance drops can alter the frequency response.  The amplifier's output will start to emulate the impedance chart.  Look at almost any tube amp review in Stereophile and the simulated speaker load for an example. It can also be why some cables sound different.

Having said all of this, Tekton often leaves me scratching my head.  While I find the use of many tweeters truly innovative, possibly derivative, but still very interesting I also find at times really questionable crossover design choices.  2 Ohms for 98 dB sure seems like one of them. 

Best,
E