Samsung TV Optical Output - Low Audio Level?
Hi everyone,
I have two different DACs: Canary Daart and Muse Audio DAC6X. I connected both to my Samsung TV's optical output and played a 0dBFS test signal from the YouTube app on the TV.They both gives 300mV pp on 0Dbfs named 1khz 60 minute video and gave 500mV pp max on another 1khz videos.I read everybody tells 2V rms should be get from dac RCA outputs. But mine is much smaller than this.
I also tried adjusting the PCM output settings on the TV, including setting it to the maximum available output level, but nothing changed. The audio level remains the same.
Possible reasons I can think of:
Does Samsung TV’s optical output reduce the audio level?
Is the YouTube app on the TV not outputting a full-scale (0dBFS) signal?
Is there an adjustable digital output volume setting on the TV that I might be missing?
Has anyone tested or measured the optical output of Samsung TVs? Any insights would be appreciated.
Thanks!
Hi everyone,
I have two different DACs: Canary Daart and Muse Audio DAC6X. I connected both to my Samsung TV's optical output and played a 0dBFS test signal from the YouTube app on the TV.They both gives 300mV pp on 0Dbfs named 1khz 60 minute video and gave 500mV pp max on another 1khz videos.I read everybody tells 2V rms should be get from dac RCA outputs. But mine is much smaller than this.
I also tried adjusting the PCM output settings on the TV, including setting it to the maximum available output level, but nothing changed. The audio level remains the same.
Possible reasons I can think of:
Does Samsung TV’s optical output reduce the audio level?
Is the YouTube app on the TV not outputting a full-scale (0dBFS) signal?
Is there an adjustable digital output volume setting on the TV that I might be missing?
Has anyone tested or measured the optical output of Samsung TVs? Any insights would be appreciated.
Thanks!
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Oddly I have noticed exactly the same on both my TV and on the satellite box. I've always assumed it was because the TV has EQ capability and they attenuate the signal so it doesn't overload if you add a boost. Easy to test by boosting each band by 10dB and seeing what happens to the signal. I've been seriously considering sticking my miniDSP in the feed in order to boost the digital signal.
I recently learned that Youtube limits the amplitude of any upload to -14 LUFS. LUFS = Loudness Units relative to Full Scale. (Never heard of the before but it is a real unit)
Even if you were able to measure the amplitude of the digitally coded signal you still wouldn't know if Youtube outputs -14 LUFS or that you TV has insufficient gain.
On my PC if I generate 0 dB (as showed by PulseAudio) and measure the analog output, I measure -0.2 dBm (almost 0.775 V RMS). Then I use a USB-to-SPDIF converter, and this low cost DAC, I also measure -0.2 dBm at the output.
I haven't used a Youtube test signal yet. It might be unreliable.
Even if you were able to measure the amplitude of the digitally coded signal you still wouldn't know if Youtube outputs -14 LUFS or that you TV has insufficient gain.
On my PC if I generate 0 dB (as showed by PulseAudio) and measure the analog output, I measure -0.2 dBm (almost 0.775 V RMS). Then I use a USB-to-SPDIF converter, and this low cost DAC, I also measure -0.2 dBm at the output.
I haven't used a Youtube test signal yet. It might be unreliable.
