LABORATORY TEST REPORT
The technical performance of the Dynaudio Focus 60XD is exceptionally good, essentially showing what it’s possible to achieve...
Newport Test Labs measured the frequency response of the Dynaudio Focus 60XD as 18Hz to 32kHz ±3dB. (See Graph 1.) This is not only an excellent result, it also exceeds Dynaudio’s own specification, which is 18Hz to 24kHz ±3dB. The superb low-frequency extension suggests to me that Dynaudio is using equalisation to extend the low-frequency response rather than just depending on the raw performance of the drivers and cabinet. In addition to being extended, the response is exceptionally flat, without any ‘skew’ that would favour either the high or low frequencies. Across the band from about 200Hz up to 16kHz, the response is within ±1dB… it doesn’t really get much better than this.
The high-frequency response of the Dynaudio Focus 60XD is shown in Graph 2. This was measured by Newport Test Labs using a gating technique that simulates the response that would be obtained in an anechoic chamber. Again it is remarkable for its smoothness, flatness and extension. The Dynaudio Focus 60XD has user-adjustable high frequency response, via a three position switch, so the lab has shown all three responses. Although the +1dB trace (red trace) looks to be exactly +1dB, the –1dB trace (blue trace) looks to be about –2dB rather than just –1dB. There’s no doubt that it does allow fine adjustment though.
Graph 3 also shows the high frequency response of the Dynaudio Focus 60XD, but this time shows the difference in the frequency response when the speaker is operated without the grille (black trace) and with the grille fitted (red trace).
You can see that the most linear response is returned when the grille is not present, with the grille introducing small dips in the response around 3kHz, 6kHz, 9.5kHz and 15kHz and attenuating the response by about 2.5dB above 20kHz. All four dips are so slight—and so high in frequency—that I doubt they’d be audible even in direct A–B comparison, but there’s no doubt the speakers deliver flattest response with the grilles removed. Note that if you like the level with the Treble switch in the –1dB position when the grilles aren’t fitted, you’ll probably prefer the Treble switch to be in the +1dB position when the grilles are fitted.
The Dynaudio Focus 60XD also has a ‘Speaker Position’ control to reduce the level of bass if the speaker is placed close to a wall or a corner. The effect of this control was measured by Newport Test Labs and the results are presented in Graph 4. Graph 4 shows the response when a nearfield measurement technique is used, which simulates the response that would be obtained in an anechoic chamber. You can see that the Speaker Position switch is essentially a single-band parametric equaliser with a centre frequency at around 90Hz and a bandwidth of around two octaves. These traces were measured with the speaker well clear of all boundaries, for which the correct setting was ‘Neutral’, and you can see from the black trace that the Dynaudio Focus 60XD’s bass drivers performed perfectly across their designed operating range, extending from 18Hz to 220Hz ±3dB. If the speaker were to be placed against a wall, the proximity would ‘boost’ the red trace up to equal that of the black trace, and if the speaker were close to a corner, the corner proximity would ‘boost’ the blue trace up to equal that of the black trace.
Graph 5 shows the in-room response of the Dynaudio Focus 60XD measured using a pink noise test signal, with the capture extended up to 10kHz. Again the low-frequency extension is evident, and the smoothing effect of averaging the traces shows even-better the flatness of the response from around 250Hz up, where it almost tracks the graphing line.
Graph 6 is a composite plot showing the individual responses of the drivers. You can see the bass drivers crossing to the midrange at 200Hz and the midrange driver to the tweeter at 2.5kHz. The main trace is the same as shown in Graph 1.
The technical performance of the Dynaudio Focus 60XD is exceptionally good, essentially showing what it’s possible to achieve from a loudspeaker system when the designer has complete control over not only the acoustic part of the design, but also the electronics. It also shows the superiority of electronic crossover networks over their passive counterparts and how sensibly implemented electronic equalisation can improve performance—especially bass extension.
Outstanding performance in every aspect of performance. Steve Holding
graph 1. Frequency response. Trace below 1kHz is the averaged result of nine individual frequency sweeps measured at three metres, with the central grid point on-axis with the tweeter using pink noise test stimulus with capture unsmoothed. This has...
graph 2. High-frequency response, expanded view showing effect of treble control. (Red trace +1dB. Black trace 0dB. Blue trace -1dB.) Test stimulus gated sine. Microphone placed at three metres on-axis with tweeter. Lower measurement limit 1kHz.
graph 6. Averaged in-room frequency response using pink noise test stimulus with capture unsmoothed. Trace is the averaged results of nine individual frequency sweeps measured at three metres, with the central grid point on-axis with the tweeter.
graph 7. Composite response plot. Red trace is output of midrange driver. Dark blue trace is anechoic response of bass drivers. Light blue trace is gated (simulated anechoic) response (ignore below 2kHz). Black trace is averaged in-room pink noise...
graph 3. High-frequency response, expanded view, at 0dB without grille (black trace) and with grille fitted (red trace). Test stimulus gated sine. Microphone placed at three metres on-axis with dome tweeter. Lower measurement limit 1kHz.
graph 5. In-room low frequency response showing effect of speaker position control. Neutral (black), Wall (red) and Corner (blue). Pink Noise Stimulus.
graph 4. Low frequency response showing effect of speaker position control. Neutral (black), Wall (red) and Corner (blue). Nearfield acquisition.