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Sound distortion - crackles in bass after Dirac filter - advice target curve 4 months 2 weeks ago #58436

  • entripy
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so in such case would you simply straighten up the room curve near the 50-60Hz and go down to -10dB? Or should I keep this dip as it is and compensate with subwoofer? (subwoofer fills up the dip nicely but it introduces other issues)
 

Remember you have 4 presets on the SHD so you can try 4 different calibrations with a different target in each to learn which work better with Dirac.

I would always be tempted to have a nominally flattish target so I would try one preset with the target dropped to the level where it is at the dip so Dirac doesn't need to boost more than 10dB. An alternative that many folk have done is to run the target along the bottom of the lowest dips. Dirac then doesn't have to boost at all so SHD gain can be run up to 0dB with no problem. Ultimately it all works out as the same level because gain is just being moved around from one place to another. All that's changing are things like headroom and dynamic range.

Subs are great but until you have time aligned them with REW they typically don't integrate well.
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Sound distortion - crackles in bass after Dirac filter - advice target curve 4 months 2 weeks ago #58437

  • czupet
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that's exactly what i do. I polished the joint outcome with REW, but it's so time consuming and quite frankly quite unpredictable (at least with my knowledge). My main learning is that any filter (even the DSP filter) messes up with phase. so final result was easiest to predict with minimum filters applied (I bought another MiniDSP HD24, just to adjust the sub). Eventually I ended up with the crossover inbuilt in the Sub (REL T9i). 

But my question is specifically about building such dip in the room curve. If my filters on HD24 changed the phase so much, maybe such dep in Dirac also creates a lot of unwanted distortions. do you have any knowledge on this? Should I rother search on Dirac forums?

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Sound distortion - crackles in bass after Dirac filter - advice target curve 4 months 2 weeks ago #58441

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Most filters affect phase, rooms affect phase, speakers affect phase. Since the Dirac filters are trying to undo the effects of the room and the speakers the phase shifts Dirac causes should undo some of the phase shifts the room and speakers cause. Overall the frequency magnitude and phase response should both be improved.

On a well configured Dirac system phase problems shouldn't be a concern as long as all SHD channels are properly time aligned. Dirac's filters are more advanced than most.

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Sound distortion - crackles in bass after Dirac filter - advice target curve 4 months 2 weeks ago #58456

  • Ultrasonic
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I do not understand the Dirac and SHD behavior regarding boosting and reducing the volume. I would expect that Dirac does this completely automatically. Dirac should know the maximum boost that it applies. So it could reduce the gain by exactly this amount, I think.

Whatever you may expect, the simple fact is that Dirac Live as implemented on miniDSP does not automatically apply attenuation to prevent clipping. It is therefore up to the user to apply this as required.
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