Thiel CS6 Loudspeaker Measurements part 2
Fig.4 Thiel CS6, vertical response family at 50", normalized to response on tweeter axis, from back to front: differences in response 20 degrees-5 degrees above-axis; reference response; differences in response 5 degrees-10 degrees below-axis.
Fig.5 shows what happened to this quasi-anechoic behavior in my room. This spatially averaged response, centered on the positions of my ears, is flat overall other than a slight treble rising trend, a lack of energy in the lower crossover region, and an excess of bass energy—together, these result in a slightly swaybacked profile to the curve. No wonder the speaker had great bass. In a larger room than mine, the CS6's bottom end would sound more neutrally balanced.
Fig.5 Thiel CS6, 1/3-octave, spatially averaged response in JA's listening room.
In the time domain, the speaker's impulse response on the tweeter axis (fig.6) appears time-coherent, with only a minimum amount of post-pulse ringing. However, the step response on this axis (fig.7) reveals that the woofer comes in a little late, meaning that the speaker is actually time-coherent slightly below the tweeter axis.
Fig.6 Thiel CS6, impulse response on tweeter axis at 50" (5ms time window, 30kHz bandwidth).
Fig.7 Thiel CS6, step response on tweeter axis at 50" (5ms time window, 30kHz bandwidth).