02-13-12: Digepix
Here's another one: Harbeth speakers, less sensitive than my Vandersteens and are an easy load for amps to drive my YBA amp is a great match for them ...
If the Harbeth's were similar in their frequency response and impedance characteristics to the M40.1, for which John Atkinson's measurements are shown
here, there are a couple of factors which probably contributed to that.
First, their near-field frequency response has a 7 db peak at 70 Hz, relative to the response at 1 kHz, and a smaller but significant elevation throughout the mid-bass region. Those are the kinds of frequencies where most music has its greatest energy levels. A 7 db rise results in the same sound level at the particular frequency that would occur if there were no rise but amplifier power is multiplied five times.
Also, as JA notes, "the M40.1's plot of impedance magnitude and phase angle suggests that the Harbeth is easy to drive in terms of its demand for current."
I know of a fellow 'Gon member who very successfully drove an M40.1 with a 32 watt per channel VAC Renaissance 30/30.
Regards,
-- Al