No, see this thread:
emotivalounge.proboards.com/post/728764/threadMar 30, 2015 17:57:51 GMT -4 KeithL said:
Just to clarify something - Dirac doesn't "handle" crossovers at all.
Dirac Live treats each channel as if it's full range, and corrects it as such (although it may not apply corrections above or below the frequencies which it considers to be the functional limits of the speaker, it doesn't block any frequencies form reaching the speaker). Dirac DOES NOT KNOW OR CARE what the crossovers in the XMC-1 are set to. The crossovers in the XMC-1 then act independently of Dirac Live to do bass management.
There also seems to be some serious misunderstanding about what a crossover does (in the quoted post).
You CANNOT "tell the XMC-1 not to play the test tone over the front speakers"; what you can do is to instruct the XMC-1 to apply an electrical filter that will alter the level of those test tones based on frequency.
For example, you can set the XMC-1 to apply a 24 dB/octave high-pass filter at 100 Hz.
If you do this, then the XMC-1 will leave all frequencies well above 100 Hz alone, apply a cut based on frequency that works out to -3 dB 100 Hz, -27 dB cut at 50 Hz, and approximately -50 dB at 25 Hz.
This is how a 24 dB/octave filter is SUPPOSED to work, and how they all do.
However, there's nothing to prevent the filters created by Dirac Live from applying additional boost or cut at some frequencies.
Likewise, if you're using the manual PEQs in the Speaker Presets instead, there's nothing to prevent them from making additional changes to the frequency response.
And, finally, these changes are applied to the frequency response of the speaker as it already is in your room.
As an extreme example, let's assume that your room and speaker (as a combination) have a nasty resonance that results in a 27 dB peak at 50 Hz.
If you add the response of our 100 Hz 24 dB/octave filter in the crossover to that in-room frequency response, the net result will be that the response will be 0 dB at 50 Hz (the peak in the room will cancel out the action of the crossover at 50 Hz).
This is, again, the way it is supposed to work.
If you want the crossover to cut in more suddenly, and do a more thorough job of blocking sound below its cutoff frequency, then you need a SHARPER FILTER.
Unfortunately, the sharper a filter you use, the more processing power it requires, and the more likely it is to produce audible unpleasant side effects.
For this reason, very few vendors offer filters sharper than the 24 dB/octave ones we use.
nickwin Avatar
Mar 30, 2015 17:21:37 GMT -4 nickwin said:
I'd be interested to see if turning enhanced bass on has any effect at all. What I'm feeling right now is theres no good outcome here. Either the crossover is working as it should and Dirac simply doesn't handle crossovers well, or the crossover is behaving abnormally but its how Emotiva "intended" in which case a fix seems unlikely. Seems to me that a crossover that allows sound well below the set-point to be easily audible is failing at its job but hey what do I know!
