Thiel's measurements
The unit measurements can of course also be found on Thiels' website. I've summarized their unit measurements on this page for quick access and comparison.C^2 12
C^2 79
C^2 220-T6
Observations
Studying the units, some of my observations are:The C^2 12-6 is an easy unit, with no too much deviations. It has an average efficiency of 88dB. It attenuates above 17kHz, ending at 85.5dB at 20kHz. The impedance is rather flat, between 6 and 9 Ohm. The step response, impulse response and distortion show incredibly good performance.
The C^2 79-6 is a tricky unit to use. It has a gain in response of about 5dB from 1 to 2 kHz, and it starts to break up at 6kHz. Furthermore, its efficiency slowly attenuates from 1kHz towards 200Hz. This means that this unit requires dedicated filtering to obtain a somewhat flat response. The impedance curve hints at the need for impedance correction. Step response, distortion and waterfall show good performance.
The C^2 220-T6 shows a large breakup at 3.75kHz. From the harmonic distortion figures, one can clearly see that this resonance is already excited at 1.25kHz, where it appears as 3rd harmonic distortion. Although the waterfall shows its resonance quickly fades away, I would hardly advice this unit for a 2-way system or first order filtering. The impedance curve shows the need for impedance correction, and the use of a stable amplifier with a high dampening factor. Besides the resonance, the waterfall, step response and distortion look very promising.
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