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σε γενικες γραμμες το αποτελεσμα μπορει να ειναι απο πολυ καλο εως εξαιρετικο, αλλα χρειαζεται προσοχη και πολυ καλο διαβασμα του πως δουλευει το συστημα...What is the difference between Crossover and Cutoff as they apply to ARC implementation?
A: Bob Pariseau says "For a main speaker, the Cutoff is the lowest frequency where ARC applies resources for correction. Think of it as the other end of Max EQ Frequency. I'm not sure, but I suspect there's actually at least an octave of slop in there rather than it being a hard stopping point. I.e., application of correction resources sort of rolls-off below that frequency.
The Crossover is where ARC imposes a roll-off -- an attenuation -- of the bass output of a main speaker -- i.e., because the bass is being steered to the subwoofer. The roll-off is 12dB per octave as I recall. That is at half the Crossover frequency the speaker output will be 12dB below the basic volume level of the ARC solution (with possible adjustment for Room Gain).
In the current ARC version, the Cutoff and Crossover for the main speakers are ALWAYS set the same. Which makes sense. If ARC isn't going to correct that speaker very far below the Cutoff frequency, then you want the output of the speaker below that point to be attenuated. Which is just what the Crossover does. So if you alter the Cutoff for a main speaker in the Targets window, you are ALSO altering its Crossover. This will be readily visible in the shape of the new Targets curve.
The same sort of thing happens for the Subwoofer, but at the HIGH frequency end of its output. Think of the Cutoff of the Subwoofer as kind of like Max EQ Frequency for the sub.
One big difference is that the current version of ARC allows the sub Cutoff and sub Crossover to be DIFFERENT. ARC controls the Crossover (since allowing you to alter it would over-constrain the solution -- i.e., the Crossover needs to be set in a way that works with what's going on with the main speakers). But you can tweak the Cutoff.
ARC itself often uses this freedom to improve the solution. Typically the sub's Crossover will be set at a lower frequency than the Cutoff. This attenuates the high end output of the sub, but still allows correction resources to be applied above that point."