- Written by Robert Kozel
- Published on 25 July 2011
- Anthem MRX 700 7.1 A/V Receiver
- Page 2: Design of the Anthem MRX 700 7.1 A/V Receiver
- Page 3: Setup of the Anthem MRX 700 7.1 A/V Receiver
- Page 4: The Anthem MRX 700 7.1 A/V Receiver
- Page 5: The Anthem MRX 700 7.1 A/V Receiver On the Bench
- Page 6: Conclusions About the Anthem MRX 700 7.1 A/V Receiver
- All Pages
On The Bench
At 1 kHz, THD+N was 0.03251%. We see a lot of even and odd harmonics as well, which average about 80 dB below 0 dBFS.
At 10 kHz, THD+N was 0.01416%.
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.
The IMD measurement was 0.0267%. We have a second order harmonic out at 14 kHz that is around 90 dBV below 0 dBFS.
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 MRX700. The tests used were: Overscan, Whiter than White, Blacker than Black, Luma and Chroma Burst, and Luma and Chroma Plate.
As you can see, the MRX 700 had some problems properly passing Chroma data. Regardless of the color space, the MRX 700 had difficulty processing fine vertical lines of the highest resolution color data. The problem ranged from a significant loss of Chroma information using 4:2:2 and 4:4:4 color spaces, to a flickering of the fine vertical lines when using the RGB color space. The problem could also be seen in the Chroma Plate patterns which were very dark at the edges when using 4:2:2 and 4:4:4 color spaces.
I also tested converting 1080i component video to HDMI, and the same problem with fine vertical lines is also present. The problem is also evident in the Luma Burst pattern when processing component video. The MRX 700 was also not able to pass blacker than black, and whiter than white when processing component video. While the Chroma resolution problem may not be readily obvious while watching Blu-ray or television content, I was able to detect the loss of fine detail in Blu-ray content. I made Anthem aware of my findings and they are looking into possible resolutions for the fine vertical line problems. We'll certainly let you know if the issue is resolved. In the meantime, if you are able to set your Blu-ray player or video output device to RGB, you will minimize the effect of the problem.
For the deinterlacing tests, the MRX 700 did well with the exception of the 24p pull-down test. This test validates that the device is capable of properly deinterlacing 1080i60 to 1080p24. In the case of the MRX 700, the A/V receiver does not offer an option to force its video output to 1080p24. The MRX 700 will only pass a 1080p24 output signal if it receives such a signal as an input. I set my Oppo BDP-95 to 1080p24 output, and verified that the MRX 700 did do a proper job of sending the 1080p24 signal to my display. Unfortunately, since the MRX 700 can't perform 1080i60 to 1080p24 conversion, it gets a failing mark on this test.