- Written by John E. Johnson, Jr.
- Published on 25 January 2010
On the Bench
Tests were performed into a 100 kOhm load. Output ranged from 1.2 volts to 1.5 volts RMS. There are a lot of graphs on this page. If you get a little confused as you scroll down, comparisons are made between the BDP-83SE, BDP-83SE NuForce Edition, and the BDP-83 Standard Edition. Where they are compared, you will see a graph with a yellow spectrum followed by two graphs with red spectra. The graph with the yellow spectrum is the BDP-83SE, and the next graph following that one will be the BDP-83SE NuForce Edition (red), and then the BDP-83 Standard Edition (red). So, when you want to compare graphs for a specific test, scroll between the yellow graph and the two red graphs below it.
At 1 kHz, THD+N was only 0.004% at 16/44.1 sampling, and 0.001% at 24/96 and 24/192. With SACD, the value was a bit higher because of the out-of-band noise, but you can see that the peaks within the audio band (20 Hz - 20 kHz) are at least as good as the other graphs.
With SACD, again, the NuForce performs a bit better than the SE, and both are obviously much better than the SV.
At 10 kHz, distortion was still very low. Again, the value for SACD was higher due to the out-of-band noise that reaches its highest level at 40 kHz. This noise is typical of Delta-Sigma modulation and is one of the criticisms of SACD.
Using 19 kHz and 20 kHz sine waves as the test signal, the B-A peak at 1 kHz was nil. This is very impressive. The bottom graph (SV) has numerous side peaks around the 19 kHz and 20 kHz input signals. The difference between the SE and the NuForce is that the NuForce has less side peak signal (look at the broader peaks between - 60 dB and the baseline with the SE version).
For SACD, both the SE and NuForce perform far better than the SV, but there is a noticeable improvement at the base of the input signal peaks in the NuForce vs. the SE.
IMD was also extremely low. IMD is calculated by measuring the peaks within 250 Hz on either side of the 7 kHz fundamental, so the value for SACD does not include the noise peaks in the out-of-band region. Nevertheless, IMD for SACD was a bit higher than with the PCM signals (16/44.1, 24/96, 24/192). IMD for the SV was twice as high as with the SE and NuForce versions.
The noise spikes in the above graphs are probably being picked up in the single-ended RCA cables Going to a balanced output design (XLR) would help to eliminate these (as long as your preamp true balanced XLR inputs). Maybe the next version?
Frequency response results are shown below. For the Standard Version, the response was down only 0.05 dB at 20 kHz, and 0.2 dB at 50 kHz. The SACD decoding includes a filter above 20 kHz. This reduces the impact of the out-of-band noise, which can interfere with the clarity of the audible frequencies ("beating" and IM). The NuForce version rolls off similar to the SE, while the SV has a slight rise at the high end of the audible spectrum.
Jitter was very low both in the stopped mode and when playing an 11 kHz test signal. When playing, jitter was between 7 and 10 picoseconds, which is the data-dependent jitter. The peaks are called periodic jitter and are there whether a disc is playing or not. Data-dependent jitter and periodic jitter are both in the category of deterministic jitter. There is also random jitter that is usually due to thermal noise. Notice the difference between the jitter from the coaxial output and the Toslink output. This should put to rest any question about which output you should use if you have the choice. I have seen this same difference between coax and Toslink in another player of a different brand, the review of which will appear shortly, so it is not something specific to OPPO.
Jitter was slightly lower in the NuForce player than in the standard player.
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