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General speaker questions for audio and home theater.

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Speaker load vs. Sensitivity with a tube amp

Posted by gnugear on March 31, 2007 at 09:30:36:
I've got a 40 watt integrated tube amp and have a question regarding speaker loads and sensitivity.
My amp has 4ohm and 8ohm taps. Will an 8ohm speaker always be an easier load to drive than 4ohm?
Secondly, I noticed that with my current speakers (6ohm), the volume is louder on the 4ohm tap. Does that mean that a 4ohm speaker with a slightly less efficiency rating (possibly) play as loudly as my current speaker?
Lastly, will a lower impedence dip be easier on a tube amp vs. a solid state amp?