Magnus, a speaker should always be viewed in relation to what amplifier it would be used with.
If you have a low output (low wattage) amplifier, especially the vacuum tubed variety, you would want to use a fairly efficient speaker with high(ish) impedance rating and benign impedance curve.
If you have a huge, high watt solid state amplifier, you would normally want a less efficient speaker with a lower impedance rating. Very efficient speakers on big amps sometimes result in a audible hiss. (Note, I said sometimes, not always). Low efficiency speakers go a long way to hide amplifier and line noise.
Youll find that many very efficient speaker are expensive, and it normally works out cheaper to purchase a bigger amp with less costly less efficient speakers.
Low output amps are also not always cheaper. Many single digit output tube amps can retail for many tens of thousands of dollars. Price of the amp is determined by a number of factors, not always simply on output.
Regards
Paul
If you have a low output (low wattage) amplifier, especially the vacuum tubed variety, you would want to use a fairly efficient speaker with high(ish) impedance rating and benign impedance curve.
If you have a huge, high watt solid state amplifier, you would normally want a less efficient speaker with a lower impedance rating. Very efficient speakers on big amps sometimes result in a audible hiss. (Note, I said sometimes, not always). Low efficiency speakers go a long way to hide amplifier and line noise.
Youll find that many very efficient speaker are expensive, and it normally works out cheaper to purchase a bigger amp with less costly less efficient speakers.
Low output amps are also not always cheaper. Many single digit output tube amps can retail for many tens of thousands of dollars. Price of the amp is determined by a number of factors, not always simply on output.
Regards
Paul