RK62T Measurements and Analysis
Impedance / Phase Measurements of the RK6T2
The single wired impedance of the RK6T2’s is roughly 8 ohms while the two wired impedance is (as expected) ½ of that – 4 ohms. The impedance of these speakers is rather benign maintaining +-30 degree phase within the entire audio spectrum and never dipping much below 4 ohms (two wire connection) at any frequency. This demonstrates deliberate and careful crossover design to ensure these speakers will work well with a wide variety of amplifiers.
In Room Nearfield Frequency Response (1/12th octave smoothed)
I measured these speakers in the Audioholics showcase theater room placed on the floor with the mic 1 ft away and up slightly above the acoustical center of the speaker. The results were quite outstanding, maintaining a +-3dB frequency response from 60Hz to 16kHz. The one wire measurement was slightly more linear, while the two wire measurement showed an increase in loudness by about 6dB (as expected since the impedance was halved) and slightly more top end which is likely a function of mic positioning more than anything. The usable bass extension of these speakers appears to be in the mid 40Hz region. By placing them against a surface as Boston Acoustics suggests, you could achieve up to 12dB of gain in the lower frequencies by doing this.
