Though John Atkinson measured the Type Bs when they were delivered to Santa Fe, he refrained from giving me the data until after I'd finished the auditioning.
The B's impedance magnitude and phase angle with the rear tweeter on (which lowers the impedance above 8kHz) are shown in fig.1. The curve with the large peak at 1kHz is with the treble control at maximum, the flatter curve with it set at minimum. The minimum impedance was 2.7 ohms at 2.8kHz (tweeter level maximum) and 4.5 ohms at 250Hz (tweeter level at minimum). The impedance phase angle was fairly…