Klipsch THX Ultra2 Measurements (cont.)
Figures 14, 16, 17, and 18 show the amplitude response of the frequency response of the KL-650, KL-525, KS-525 and KW-120 systems, obtained by the application of gated, near field and ground plane measurements, as appropriate, scaled to 1m.
The relative flatness of the response curves (particularly with the KL-650 & KL-525s) underscores the tonally balanced & sonically accurate presentation of this very impressive system. It's easy to see how
the musicalness (ability to accurately render the timbre of individual instruments) of the system is as outstanding as it is.
The grill cloth used by Klipsch is, acoustically substantially, substantially transparent. Figure 15 shows a comparison between dB spl measurements made with and without grill cloth in place. A perfectly transparent grill cloth would have produced a ruler-flat line, centered at 0 dBr. As it is, the curve is very flat and better than some I have seen of systems costing far more than the Klipsch Ultra THX2.
The KW-120 were measured outdoors, using the ground plane technique. The initial measurement was made at 2.828 Vac drive level and increased incrementally. The dB spl curves showing in Figure 18 are for 1 sub, Figure 19, 2 subs. (Note: some of the curves look messy in the 10 - 15 Hz segment; this is due to environmental noise and should be ignored).Pairing 2 KW-120s and firing their combined acoustic output into 1/8th space (ie, 2 KW-120s placed side by side in a corner of a listening room) and the dB spl levels listed in the Klipsch spec sheet are reasonably obtainable.
