Well-recorded classical piano fared particularly well with the small KEFs corrected by the M10's Dirac Live. I continued listening to recordings I knew well, both classical and rock. This was definitely a step in the right direction. The low frequencies became richer and the orchestral sound acquired greater bloom. Bach's "Wachet Auf," from a favorite album, Yo-Yo Ma and the Amsterdam Baroque Orchestra's Simply Baroque II (16/44.1 ALAC files ripped from CD, Sony Classical 60681) when, using the BluOS app, I turned on the low-frequency correction Dirac had calculated for the KEF LS50s. When I then ran the BluOS app on the iPad, the Audio Settings menu now included an on/off switch for "LS50." The target response for the filter is shown as the dark blue trace in fig.1 and can be compared with the before and after responses for each speaker (respectively thin and bold green and red traces).įig.1 Target response, 50Hz≥00Hz, calculated by Dirac Live for the KEF LS50s (dark blue), with responses in JA's listening room of left loudspeaker (corrected, bold green, and uncorrected, thin green) and right speaker (corrected, bold red, and uncorrected, thin red). Imaginative as always, I called the correction filter "LS50." After the last test, Dirac calculated a correction filter and asked for it to be named and saved to the M10's internal DSP. I then followed the on-screen instructions, placing the microphone in each of the nine positions specified by the app and performing a "chirp" test at each. When I ran the app with the M10 driving my KEF LS50s, it found and identified the amplifier, reduced the playback volume, and performed a level check. I installed the Dirac Live app on my iPad mini, after first making sure that it and the M10 were connected to the same network. To use Dirac Live LE with the M10, I plugged the microphone supplied with the amplifier into the 3.5mm jack on the USB adaptor, also supplied, and plugged that into the USB Type A port on the M10's rear panel. Sidebar 1: Trying Dirac Live Room Correction
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January 2023
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