At 70dB SPL your speakers are not getting 1 watt or 2 watts or 10 watts, in fact they are not even getting 1/2 watt. At 70dB SPL your speakers are getting milliwatts from the amp. In my experience driving low efficiency speakers with milliwatts will sound anemic at low volume; high efficiency speakers can play well with milliwatts and not sound anemic at low volume. Also amplifiers, tube amplifiers and SS amps produce more distortion in lower impedances then higher impedances. In my opinion, higher efficiency (not higher sensitivity) and higher impedance speakers make more sense then a more powerful amp. 😎
Hope that helps. See article below:
Mike
@mulveling Wrote:
You should definitely subscribe to the "First Watt" philosophy.
I agree!