Is this enough power?

Your speakers are rated at a nominal impedance of 6ohms but what matters to your tube amp is the real life impedance swings during varying frequencies. If your speakers offer a relatively benign 6 ohms and your amp has a 4 ohm tap, you should be alright. As other posters have mentioned, if your speakers present too much of a load to the amp, dynamics will be affected along with a flat uninvolving sound. I love 845 based amps, but they do require more attention to speaker compatibility.

You will get about 102db max continuous. Add in dynamic peaks and you won't be listing to anything loud. At moderate volumes it should work.

I drive my B&W CDM9NT´s with a Bel canto SETi 40 (845 tubes) which have a nominal impedance of 8 ohms (the impedance curve indicates that about half of the curve stays below 6 ohms!!). I lisen to rock and reggae at a moderate to high volume most of the time with no problems at all. My room measures 10x19x9. IMO you will not have problems with your amp.

Thanks for all the responses.

I found an impedance graph for the speakers.

Between 1k and 20k it is 6 ohms and peaks at 12 ohms at 5k.

From 1k and below it is ruler flat at 4 ohms.

Does this new info alter any of the comments?

the amp does have a 4 ohm and 8 ohm tap. Not sure which one would be the best to use.

Thanks

Experiment with both the 4 and 8 ohm taps as you cannot hurt your amp or speakers.