Watts and power

"2 watts of SS power to equal 1 watt of tube power"

...And it takes 2  inches on a tape measure to equal to 1 inch on a rule.

Repeat:

 I’ve been through a min of 7-8 amplifiers over the years, since about 1990 or so.

 Once I went beyond 300WPC @ 8 OHMs, I NEVER looked back.
during crescendos, and power chords, you will need that headroom to keep up,  o clipping. I have two setups......one is 750W @ 8 OHMS, ........second is 600W @ 8 OHMS. 

NEVER CLIP, always sounds careless, amps rarely get hot.
  I have heated up my upstairs system pretty good, while playing at a constant high volume, always sounds good,
  
 You will thank me later.

 These 2W or 150W maps are,nice for a bookshelf, if u have fullrnage speakers,get a,minimum of 200W at @ 8 ohms
  personally, I’ve had no less than a minimum of 500W/chaannel/rms into 8 ohms.

ive never looked back.

just use caution with your volume knob ;)

@atmasphere and others, when I read, for example, the power rating for the parasound A 23+, it states:

• 160 watts x 2 @ 8 Ω RMS, both channels driven
• 240 watts x 2 @ 4 Ω RMS, both channels driven

My assumption has always been that the top 8ohm figure is relevant to the use of not one but two 8 ohm speakers, as is stated on the website. Your figuring seems to suggest that playing two 8 ohm speakers would imply the second figure, or 240 watts from the combination of the speakers, or 4 ohms?

The also suggests, following what I think I understand of your claim, that few of the amplifiers on the market should be used for two 4 ohm speakers, as they don’t often state a 2 ohm power rating...

@listening99, Ralph (@atmasphere) clearly interpreted your initial posts as referring to powering two speakers per channel simultaneously (i.e., a total of four speakers). However it now seems apparent that you would only be powering one Tekton speaker per channel with the amp, and nothing else. So Ralph’s comments do not apply, and the response by @audiozenology is applicable and correct.

I would add to Audiozenology’s comments, though, that in addition to the potential issue he cited involving mains noise a possible concern relates to the very high gain of your amp (35 db, per the measurements in the link he provided). If the Tektons are significantly more sensitive than your present speakers you might find yourself having to operate your volume control at undesirably low settings. Although your description of the present speakers as "horn loaded" (and therefore presumably very sensitive) suggests that both potential issues (mains noise and volume control settings) are unlikely to be problems, assuming they are not problems now.

Good luck with the new speakers. Regards,
-- Al

For most speakers, the amperage is more important than the wattage. This is one area in which most class D amps fall short of a class A or AB amp with an oversized linear power supply.