Erik,
With a low of 3.5 Ohms with a phase angle of 15 or so degrees is not out of normal for a nominal 4 Ohm speaker system - you must look at both impedance and phase angle. Through the whole Bass and lower midrange, where most of the current is delivered anyway, the speaker is almost resistive. Most amplifiers of modern design will drive this easily.
Good Listening
Peter
With a low of 3.5 Ohms with a phase angle of 15 or so degrees is not out of normal for a nominal 4 Ohm speaker system - you must look at both impedance and phase angle. Through the whole Bass and lower midrange, where most of the current is delivered anyway, the speaker is almost resistive. Most amplifiers of modern design will drive this easily.
Good Listening
Peter