First watt choices

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I would really like to build one but I am unsure of which one. My current speakers are have pretty well behaved impedance that stays at or above 8 ohms so they should not be too horrible.

However, it would be nice to have the option of less well behaved speakers too.

Is there and obvious choice?
 
Room size , which speakers exactly (db/W/m being most important , but not single important parameter) , SPL habits

?

Gotcha,

Right now I am running so DIY bookshelf Jeff Bagby Continuum. Not super efficient but 8 ohm nominal and no real dips. I don’t really listen loud. But I once had a Sugden A21 at 23w into 8ohm and it was great. Now I also had the first version of that at 15w and it was not enough.
 
The impedance curve may not drop below 8Ω but it is kinda ugly. No F1 or F2 for you. 45° phase angle at about 500 Hz. Remeber P=VA x cos(phase angle) = 0.707 x VA in this case.

dave
 

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F5
yup , adequate with power also , same note as for M2 , regarding preamp

though , my sympathies are always at M2 side 😀

Why does the F5 or M2 need a preamp? You mean if low efficiency speakers, or pretty much always? Just asking because I built the juma variation F5 and now curious if I have to build another thing :scratch2:😀 I've got plenty of volume with dac directly to F5. Sounds pretty great btw
 
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