The length of the signal path is so great that a calibration function on your receiver will throw crazy results. For example, Audyssey on the Denon receiver reported that the center speaker was eight meters away. In reality, the TV was located about 3 meters from our seat. We thought it was a bug, similar to the erroneous measurement results you can get with a bipole speaker setup (see our test of the
Definitive Technology BP9000 speakers). But the phenomenon is known to Sony and their advice is to keep the high reading to keep the different channels in sync. If you want to work manually, you cannot simply enter the value you measure. Incidentally, aiming at a TV screen with a laser meter is not exactly convenient or accurate.
The fascinating thing about Dirac is that you also get insight into the performance of your speakers in your room. This way we can also see how the Sony TV functions as a speaker. In our measurement we also see that delay through the signal path recur, and also a dip in the display around 220 Hz that we usually do not register with our fixed center speaker (a Dali Rubicon Vokal). We suspect that here may be the crossover point between the TV woofer and Acoustic Surface speaker in the screen. Dirac naturally wants to compensate for that, but that is not entirely possible. The rest of the measured curve looks very normal, without noticeable peaks and with a very gradual roll-off from 10 kHz.