pro's and con's of a 4 ohm speaker?

My speakers are rated for 8 ohms nominal impedance, but have a low impedance of about 3.9 ohms. My old receiver wasn't rated to be 4 ohm stable and my new one is. I know there are other factors (i.e. also jumped from 90 watts to 135 watts per channel), but there is no comparison in sound. I don't know if 4 ohm speakers have as much variance as many 8 ohm speakers do.

If you find an 8 ohm speaker that you like I don't think I've ever heard anyone claim to like the sound of all 4 ohm spekaer more than all 8ohm speakers, but the 4 ohm speakers can be more difficult to find quality amplification for.

The TEKTON 8.1en are 8 ohm speakers. The 8.1t are 4 ohms. 35 watts is more than enough to drive them. Your tube amp won't have a problem driving either of them. If you can use a floor stander you may want to consider the Tekton Lore. I just got a pair yesterday to go with my fully restored Scott LK72-B and they sound very good. At $850 plus shipping they are a true bargain.

Thanks for the answers ,yes i was wrong 8.1en is the 8 ohm . But it seems like sound wise ,,there is really not that big of a difference between 8 or 4 ohm , thats is what i am getting out of this .Correct?

Again, it all depends on the interaction between the speaker and amp, the impedance , IN ITSELF, does not make the speaker sound better or worse. If your amp can handle the load fine, if not update your fire insurance.

In general, amplifiers are happier into a high impedance load, as long as they aren't driven into clipping. So assuming all else is equal (which of course it never is), I'd suggest 8 ohms if there is no danger of clipping and 4 ohms if there is.

Now all else is never equal, and apparently you've already found speakers you really like, and unless their impedance curve is really funky they'll work fine with both your amps. Having "speakers you really like" outweighs any theoretical/speculative "amps are happier with higher impedance unless blah blah". So go for it!