- Written by Robert Kozel
- Published on 09 May 2012
The Integra DTR-80.3 A/V Receiver on the Bench
At 1 kHz with a 4 ohm load, THD+N was 0.09668%. We see a lot of even and odd harmonics as well, which average about 75 dB below 0 dBFS.
At 1 kHz with an 8 ohm load, THD+N was 0.07832%.
At 10 kHz with a 4 ohm load, THD+N was 0.04402%.
At 10 kHz with an 8 ohm load, THD+N was 0.05466%.
Here are the results for 19 kHz, 20 kHz combined test frequencies. There is a small visible B-A peak at 1 kHz about 80 dB below 0 dBFS. We also see second order harmonics starting at 13 kHz with the largest peak being at 18 kHz and around 60 dBV below 0 dBFS.
The harmonics are reduced with an 8 ohm load.
The IMD measurement was 0.0434% with a 4 ohm load and 0.0231 with an 8 ohm load.
Finally on the THD+N tests, most of the values average around .07% and then gradually roll off. The 8 ohm results are a bit cleaner which is consistent with the results observed in the other tests.
The video benchmark was done using an Oppo BDP-95 as the source device, as well as the Spears & Munsil High Definition Benchmark Blu-ray disc for test patterns. The first set of tests in the video benchmark validates that HDMI video is correctly passed through the DTR-80.3. The tests used were: Overscan, Whiter than White, Blacker than Black, Luma and Chroma Burst, and Luma and Chroma Plate.
While the DTR-80.3 did really well on all the HDMI tests, it did have an odd problem with the Luma Plate test. While I did not see any unusual loss of detail in the Luma Plate pattern, there was an obvious hourglass pattern present in the image. This is not normal for this pattern and setting the DTR-80.3 to "Direct" mode for the video source eliminated the issue. I also found it interesting that setting the DTR-80.3 to "Through" mode also shows the problem with the Luma Plate pattern. The only difference between the two modes is image scaling. In this case, the input resolution matches the output resolution of 1080p, so I'm very curious about what the image processor is really doing in this situation. As is sometimes the case with this sort of thing, I didn't see any problems when watching normal television or Blu-ray movies when letting the DTR-80.3 process the video. I passed on my results to Integra and I will let you know what they tell me.
I also tested converting 1080i component video to HDMI and the same problem with the hourglass pattern is also present. The component processing side of the DTR-80.3 had some other issues, including the inability to pass whiter than white. There was also some loss of fine detail in the burst patterns.
The DTR-80.3 passed all of the deinterlacing tests without any issue.