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Oppo BDP-105 Universal Blu-ray Player Measurements and Analysis

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Using the industry's most advanced HDMI Audio Analyzer, the Audio Precision APx585, we proceeded to measure all of the various aspects of audio performance for the Oppo BDP-105.

HDMI Digital Audio Tests

Using a 192kHz / 24 bit 6CH Dolby True HD signal, I measured a ruler flat frequency response from 20Hz to 1/2 Nyquist frequency (96kHz). Next, I ran a Dolby 96kHz /24 bit 8CH signal and plotted distortion.

 96kHz_THD

Oppo BDP-105 HDMI Frequency vs Distortion Test

As you can see the distortion level was virtually unmeasurable, approaching the limitations of my $40k Audio Precision HDMI Audio Analyzer. In fact it was roughly 10 times lower than what I measured on the BDP-95 player which in itself was excellent. You’re really splitting hairs here.

I also ran a Bit Error Rate (BER) test on the BDP-105 using Dolby TrueHD and DTS HD test signals both of which produced a 0% BER which means both players delivered audio via HDMI 100% error free. You can rest assured there are no jitter issues using the HDMI outputs for audio like early generation Blu-ray players using HDMI 1.2 used to suffer from.

Analog Output Tests

For those of you that plan on exclusively using the analog outputs of the BDP-105, I’ve run a complete battery of measurements on the player. With a player like the BDP-105, I could even envision a consumer bypassing a preamp all together and utilizing the BDP-105 as not only the Universal Blu-ray player but as the preamp itself. The BDP-105 has a global volume control and both USB and HDMI inputs to stream music and handle HDMI audio and video sources. Many folks in the high end two-channel world actually prefer using the source player as the preamp and they can easily do that with this player too.

Frequency Response

Using a -20dBFs 192kHz/24 bit True HD signal, I ran a 6CH sweep with all channels set to “large” and found the BDP-105 to be ruler flat all the way out to ½ the sampling rate, as expected. Oppo specifies this player’s -1.5dB point of 96kHz and this appeared to be accurate.

192kHz-fullrange.jpg

Oppo BDP-105 Analog Frequency Response (multi-channel outs)

I then proceeded to test the analog balanced outputs with a 0dBFs 2CH 192kHz/24 bit PCM signal and found similarly excellent results.

192kHz-fullrange-bal-0dBfs.jpg

Oppo BDP-105 Analog Frequency Response (balanced outs)

Using the same test signals and player configuration, I measured THD + N in both cases.

Distortion

THD+N_analog.jpg

Oppo BDP-105 Distortion vs Frequency (multi-channel outputs)

THD+N_analog-bal-0dbfs.jpg

Oppo BDP-105 Distortion vs Frequency (balanced outputs)

The BDP-105 exhibited excellent distortion figures for the multi-channel analog outputs (.005% THD + N) across the entire audio bandwidth. This was similar to what I measured on the BDP-95 player.

The balanced analog outputs were just stunningly excellent (.001% THD + N) measuring almost down to the noise floor of my test gear and this was despite the fact I was driving the player at 0dBFs (digital full scale). This is just superb performance.

Oppo specifies distortion as 0.0003% THD + N using a 24 bit signal at 1kHz with a 20kHz LPF. Our measurements were done full bandwidth with no LPF which is why our figures were a bit higher. Oppo confirmed our results using the exact same test equipment, test conditions and signals .

FFT.jpg

Oppo BDP-105 FFT Distortion Analysis (balanced outputs)

At 4.3Vrms output (rated max output of the player), the FFT distortion plot was crystal clean, rivaling what I’ve measured from most dedicated preamps, let alone Blu-ray players.

Crosstalk

Xtalk-analog-dolbytruehd.jpg

Oppo BDP-93 (left) and BDP-95 (right) Channel to Channel Crosstalk

Using a -20dBFS 192kHz / 24 bit Dolby TrueHD test signal, we measured channel-to-channel crosstalk at 10kHz with all channels set to large and 0dB. The Oppo BDP-105 produced stellar results, virtually unmeasurable via the left/right front channels and >113dB on all of the other channels. This is better than you get with most high end preamps, let alone Blu-ray players. Oppo rates crosstalk as > 110 dB but doesn’t specify frequency. Regardless, their player easily met this specified number. The BDP-105 defied all logic and produced numbers that tested the measurable limits of our laboratory gear.

Signal to Noise Ratio

Oppo BDP-105 SNR (1kHz, 44kHz, 0dBFs).jpg

Oppo BPD-105 Signal to Noise Ratio (SNR) with 44kHz/16bit 0dBFs signal

The Oppo BDP-105 produced textbook SNR numbers reaching the 96dB theoretical noise limitation of a 16-bit signal (6dB*16). For higher bitrate signals, the BDP-105 was able to achieve the specified 130db (a-wt, auto muted and 115dB a-wt,non auto-muted). 130dB represents about a 21-bit noise floor resolution, which is as about as good as you can get since Johnson Noise (aka. thermal noise) will always restrict you from doing much lower than this for a 100kHz bandwidth signal.

Bass Management

Setting all speakers to "small" and selecting 80Hz as our choice of crossover point, we measured the analog bass management capabilities of the BDP-105. The BDP-105 does offer variable crossover settings from 40-250Hz (20Hz increments from 40Hz to 80Hz, 10Hz increments from 80Hz to 120Hz, 50Hz increments from 150Hz to 250Hz) just like this model’s predecessor.

BMGMT.jpg

Oppo BDP-93 & BPD-95 Analog Bass Management Measurements

Note: The BDP-105 bass management only affects the analog multi-channel outputs. Balanced outputs and HDMI outputs bypass this feature.

We measured the filter slopes using a -20dBFS 96kHz / 24 bit PCM test signal. For the HPF, we measured a -3dB point of 75Hz, which was slightly lower than the 80Hz setting with a slope just shy of 12dB/octave. For the LPF, we measured a -3dB point of 80Hz with a 12dB/octave rolloff. We personally prefer to see a 24dB/octave slope for the LPF like THX recommends, but Oppo said their goal was to meet the minimum Dolby requirement of at least a 1st order filter (6dB/octave) for the HPF and at least a 2nd order filter (12dB/octave) for the LPF. Considering THX informed us they don't even test the analog outputs of Blu-ray players, we are just picking nits here.

SPK-config.jpg

Oppo BDP-105 OSD for Speaker Configuration

Oppo still allows the end user the option to set other speaker groups to “large” even if the main front channels are set “small”. Personally I’d prefer the player to auto-default to all speakers “small” once the front channels are set to “small”.

 

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Recent Forum Posts:

Mahoney posts on March 23, 2022 09:54
Hi

recently tried using the multichannel analog outs for Blu rays and the sound is far superior than using HDMI to a marantz processor

I connect the Oppo direct to the denon POA-a1hd 10 channel amp

but the subwoofer performance seems anemic

does the Oppo 105 still clip the subwoofer analog outs if you set your 5.1 speakers to Small?

here’s the Oscilloscope readings of the Oppo 105 subwoofer analog out channel

https://www.diyaudio.com/community/threads/oppo-bdp-105-sends-clipped-signal-on-sub-out-for-movies-with-strong-re-directed-bass.270944/

I even set my left , right centre and other speakers to large but the the subwoofer analog outs sound tame

one of the beta testers for the oppo 105 at avs seems to think the issue was solved by Oppo but I’m not convinced

its post 3491 by Bob https://www.avsforum.com/threads/official-oppo-udp-205-uhd-blu-ray-player-owners-thread.2821841/page-175#post-55668716

justvcant see myself moving to a home theatre processor again now cause they don’t sound that good unless you spend crazy money
frans callebaut posts on December 06, 2020 12:25
hello,
i want to buy a used oppo bdp-105 or 105D, but i see that the 105 has 8 picture noise reduction functions and the 105 D only three. what's the difference between 3 and 8 options to eliminate picture noise reduction ?
best regards,
frans callebaut
GIEGAR posts on March 22, 2017 21:43
gene, post: 949128, member: 4348
Correct, the balanced outputs are pure direct, no bass management.

… and from page 4 of the review:
Note: The BDP-105 bass management only affects the analog multi-channel outputs. Balanced outputs and HDMI outputs bypass this feature.

That's the default setting for the balanced outputs. You can in fact configure the unit to use the balanced stereo outputs and implement bass management.

This article steps through how to do it: Oppo | Using the Dedicated Stereo Outputs in a 2.1 Configuration.

You may wish to edit the article accordingly.

(Apologies if this has been covered previously; I only scanned the thread quickly.)
Coris posts on June 12, 2016 14:57
My fully improved Oppo 105…
sterling shoote posts on April 11, 2016 06:10
Using your balanced or unbalanced output from OPPO you are outputting full frequency, including low frequency. This, it appears, is not how you understand it. You believe with balanced or unbalanced stereo output you are not getting output of low frequency. Is that what you think? I believe you may be misinterpreting the manual. Read page 71 to 73. Now, you may have set your OPPO to small speakers, which would direct low frequency to sub output, at what ever crossover point you selected, down to 40Hz. Setting OPPO to large speakers will get all frequency to mains. You could also use L and R stereo balanced or unbalanced and then connect analog surround, center, and sub to get low frequency to sub if you wish.
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