- Written by Jim Clements
- Published on 04 August 2011
On the Bench
All the below measurements shown are in-room response. The frequency response tests were performed at 1-meter while the distortion measurements were taken on-axis in the near field.
The on-axis response of the KEF Q300 shows a remarkably flat response over the broad spectrum of 35 Hz to 20 kHz. The response is a little choppy in the isolated band between 350 Hz and 1.5 kHz. This was not generally audible with regular program material.
At 30 degrees off-axis, the Q300 speakers had a response curve that was actually smoother between 10 kHz and 20 kHz than the on-axis plot, demonstrating that the KEF Uni-Q design promotes fine dispersion. Elsewhere, the response is much flatter than expected for an off-axis measurement. This is a very good test result.
The THD+N at 1 kHz and 100 db was 0.80%. This is in the region where the speaker's response showed some peakiness on the frequency response tests.
At 250 Hz and 100 db, the THD+N measurement is 0.33%. Not at all bad for a $300 speaker!
At 10 kHz and 100 db, the distortion was a very respectable 0.52%.
The KEF Q300 achieved 100 db at 80 Hz at less than 3% THD + N. This is just one of the speakers being driven.