For some reason i found that bass reduces highs. Something in clipper. it's something that steep reduces highs form 4-5kHz and up. Also bass does not reduce almost nothing from 1 to 4kHz.
omg, i found huge bug in clipper, atleast i thing it's bug. 2nd bass clipper adjusted to default settings. When i set always clip bellow and dyn clip below to +6 Still all same, but when i set freqs to 0 everything works fine even sound is better and there is no reducing highs because bass. Those freq sliders should do nothing if "always clip bass below" and one under it is to 0 or +6. But they are doing something they should not do.
I'm not sure what you mean. I don't see it here. Tried this:
- RESET ALL, FM on (with RDS/Stereo), Advanced+Composite Clipper on, drive +12 dB
- Test file: Tone at 100 Hz, 1000 Hz, plus hiss above 4 kHz
With that, I see no difference in output between setting both bass thresholds to +6, and keeping them at +6 and setting the frequencies from 80/220 to 0/0.
If I set the levels to -18 dB, more highs and mids get through, and a lot less bass @ 100 Hz, but that makes sense.
Was testing with pink noise.
So all default in clipper, 'always clip deep bass below" to 0 or +6, 'Dynamically reduce' also to 0 or +6. clipper around +10dB
And then when i set both freqs to 0 sound is cleaner and no distortions from noise.
With pink noise at this level I see 0.2 dB *less* bass when the frequencies are set to 0/0 instead of 80/220. Going to 0/220 (instead of 80/220) reduces it by 0.15 dB, going to 0/0 by 0.20. Which lets a similar amount (0.2 dB) more highs through.
Edit: I found the cause of the 0.15 dB. Fixing that (which is roughly similar to setting the start frequency to 0 Hz, but not completely) would affect the mid-bass, I think. But that's probably better than the highs.
Edit 2: Found the remaining 0.06 dB as well. I don't think that changing that is an improvement though (I expect it to create a lot of highs IMD).
Actually, I'm not sure that either is an improvement, but it's impossible to test without having a lot of side effects (by changing the thresholds to +6 dB). So for now I have created 2 extra Legacy checkboxes on the ABDP page, to turn both things off separately for testing.
"TEST VLB 1" might be good. "BAD! VLB 2" should be bad, if it's not then something else must be broken. Or it's just removing too much bass, which would - as a side effect - protect the highs against IMD. But the real IMD protection that's usually working very well seems to be turned off by "BAD! VLB 2".