@barkeyzee1 Your amplifier should be able to make about 150 watts at full power on that speaker.
But as Bob pointed out its unlikely that you are actually using much more than a watt or two most of the time unless your room is quite large and absorptive.
The upside is the impedance of the speaker is helping the amp make lower distortion, which is good. The downside is that the amplifier is operating at such a low power that its distortion is probably higher than it would be if you were able to make more like 5-10 watts most of the time. Push-pull amplifiers in general tend to have a minimum distortion output that is somewhere around 5-7% of full power below which distortion is increasing. This is partly due to how the amp derives its push-pull output (IOW how its 'phase splitter is designed) and and partly due to noise.
Some push-pull amps do not have this quality and so with them distortion continues to decrease as power output drops (our amps are an example of that). SET amps also have this property which is why they are known for that 'inner detail' for which so many of them are lauded. IME this speaker has efficiency in the high 90s which means that a 30-60 watt amplifier is plenty of power in most rooms- with 60 watts you may find it uncomfortably loud without the amp clipping. Just to put a number on this, if your amp is 150 watts, a 60 watt amp will run at full power around 3.5-4dB less output, which is to say its barely detectable to the human ear. We ran ZU speakers at our shop here and our 30 watt amp could play the speakers as loud as we cared to play them.
Where this is all going is there is a very good chance that an amplifier of less power will be able to offer you more finesse. That would serve the speaker investment dollar much better- the whole goal of high end audio is to take you closer to the music and keep you involved. IME on this speaker a tube amplifier will be audibly superior to a solid state amp and no mistake, you should be able to discern the difference easily and quickly as it won't be subtle- smoother, more detailed and not as hard on top.
