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EQ Anomaly in DSP Studio

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dmitch77:
A few more observations.

1. Adding max boost at 60 Hz in Audacity to the same source does not result in the anomaly.
2. Adding max bass boost in an analog EQ (post DAC) does not result in the anomaly.
3. JRiver's EQ only exhibits the anomaly when the volume of JRiver itself is fairly high (at least 40% or -30dB).

Thanks again for the folks who looked into this.

Matt:
I'm trying to reproduce this, but not sure I'm having much luck.

I'm playing the 96k file to my Mytek DAC.

When I enable the Equalizer DSP and boost 60 Hz, it still seems pretty good on my HD 650 headphones.

Maybe try reducing the level with the "Pre Amp" slider (or internal volume) so you're not prone to clipping?

Thanks.

dmitch77:

--- Quote from: Matt on August 19, 2019, 09:11:11 am ---Maybe try reducing the level with the "Pre Amp" slider (or internal volume) so you're not prone to clipping?

--- End quote ---

I'm 100% sure that the problem I'm hearing is not clipping. I know what digital clipping sounds like, and this ain't that. Plus, the source signal is so quiet when this happens that clipping can't possibly be an issue.

mattkhan:

--- Quote from: Matt on August 19, 2019, 09:11:11 am ---I'm trying to reproduce this, but not sure I'm having much luck.

I'm playing the 96k file to my Mytek DAC.

When I enable the Equalizer DSP and boost 60 Hz, it still seems pretty good on my HD 650 headphones.

Maybe try reducing the level with the "Pre Amp" slider (or internal volume) so you're not prone to clipping?

Thanks.

--- End quote ---
I did the following

- turn off all DSP in MC inc output format
- turn on the equaliser
- set to flat
- move 60Hz to +4dB
- reduce internal volume to -32dB
- play the supplied test track
- check analyser, no distortion around 60Hz
- change internal volume to -31dB
- large 60Hz spike appears

this is nothing to do with the output device, it is purely inside MC so you don't even need to listen to anything (just monitor the content coming out of MC)
spectral analysis of the track shows it is at about -100dB in the 60Hz range, i.e. no content
there is no clipping in the waveform of the source track with an equivalent +4dB PEQ applied

if you still can't reproduce using the above approach then I have no idea what is going on.

same behaviour on linux (and when outputting to a null device)

blgentry:
That's really bizarre.  With internal volume at 0dB I can just barely see a blip at 60Hz on one or two of the impulses.  But sure enough, when you get in the range of -20 to -31 it shows up in spades.  It's much more pronounced with internal volume reduced.  How strange.

When I did my listening tests a few days ago, I had internal volume at 0dB and had Volume Leveling and Adaptive Volume both engaged.  So I know MC was applying some amount of volume reduction in that case.  I guess that's how I heard it.

Very strange stuff!

Brian.

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