Surround Sound Speaker Systems
- Written by Ross Jones
- Published on 09 August 2010
- MK Sound LCR950 Monitor Speakers, SUR950T Surround Speakers, and MX250 Subwoofer
- Page 2: Design and Setup of the MK Sound 950 Series Speakers
- Page 3: The MK Sound 950 Series Speakers In Use
- Page 4: The MK Sound 950 Series Speakers On the Bench
- Page 5: Conclusions About the MK Sound 950 Series Speakers
- All Pages
On The Bench
The LCR 950, at the low end of its rated frequency response, produces an impressively low 0.55% THD+N.
At 1kHz, distortion is 0.885%.
And at 10 kHz, 0.47% THD+N.
White noise at one foot, one meter, and two meters (in-room response).
The LCR950 is rated at 4 Ohms nominal impedance, and as shown the graph stays above 4 Ohms throughout the spectrum. Electrical phase after clearing the speaker's LF response stays between +30 and -15 degrees. As long as the receiver/amp is rated for 4 Ohm speakers, the 950's should not present a difficult load.
One of the benefits of a push-pull subwoofer design is reduced even-order harmonics, but it comes at the cost of higher distortion. As a result, the MX250 subwoofer's response at 20 Hz topped out at about 98 dB and 8.78% THD+N.
At 31.5Hz and 100 dB, distortion was down to 4.8%.
THD+N vs. frequency shows distortion at or above 10% from 10 to 30Hz, then drops rapidly. This sub is designed for maximum output rather than max low frequency extension.