Tube amps and speaker ohms

Dear Bartokfan: The speaker efficiency ( 86db,89db,etc )is not the only subject when you want to choose an amplifier, either the nominal speaker impedance ( 8 Ohms, 4 Ohms, etc, etc ) because what you need to know is not only the nominqal impedance but the electrical curve speaker impedance where you can " see " how low goes that impedance.

The other critical subject that you have to take in count is the output amplifier impedance that IMHO must be a low one: say below 0.1 Ohm.

Regards and enjoy the music.
Raul.

Dear bartokfan: +++++ " This is the way loudspeakers behave. Loudspeakers are not constant power devices. Loudspeakers must have a constant drive voltage to provide a constant acoustic output with changing frequency. As demonstrated by the simple mathematical relationships shown above, the only way to achieve constant voltage drive with a changing load impedance is by having very low amplifier impedance. " +++++

This is what you can read on the link you posted, as you can " see " this subject is critical.

Now, the tube amplifier technology has many trouble to handle in the right way all those speaker needs, so ( if you want to go with this technology ) you have to make big trade-offs with it.
Of course that you could choose for SS technology that could mate in a better way your speakers needs and your music sound reproduction priorities.

Regards and enjoy the music.
raul.

Dear paul: The statement is totally accurate, it is not talking about " speaker has a benign impedance curve across the frequency range. " like you state.

regards and enjoy the music.
raul.

Dear Paul: +++++ " prefer tubes, as to my ear, they achieve the most accurate.....of the recorded material. " +++++

Please could you explain how the tube technology can be " accurate " to the recording?

Normally the tube is a self harmonic generator ( that does not exist on the original signal/recorded signal ) and normally too due to its high output impedance a tube amplifier is everything you want/like but accurate handling the electrical speaker impedance curve.

Regards and enjoy the music.
Raul.