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It definitely will because it doesn't know that you boosted the curve! It works on a set table of values. This is probably one of the reasons why some people don't like Dynamic EQ. They try to set up their system manually to near perfection, then turn it on to see what it does. They quickly turn it off because it overcooked the system. This is an incorrect use of Dynamic EQ.Of course if you listen with DEQ you should perform the listening tests to check your curve with DEQ on. What I'm saying that I'm not sure if you set your low frequencies to match your room gain, if that would actually result in excessive bass with DEQ on or not. I suspect it shouldn't.
The vast majority of Audyssey users increase sub levels because it sets them too low.In any case, I don't see which problems you are solving by raising the subwoofer level over modifying the low frequencies by changing the curve. The subwoofer has a crossover filter applied so you are basically raising the low frequencies with a very specific curve when you turn up the subwoofer, and in addition you get that extra level just from the subwoofer and not your speakers. If you create a curve for your speakers and subwoofer so that they match at the crossover you can get a similar or better effect (better because you have more control on the actual curve, so at the very least you can get a very similar result to just raising the subwoofer level).
I find saying DEQ is meant for a flat curve and then raising the subwoofer on top of DEQ to be in contradiction with each other.
Additionally, one would think that raising the whole target curve like the approach taken by Dirac would be ideal, but that is fraught with error, especially if people use the default Dirac or Harman curves. In my experience (nearly a decade playing with this at this point) and that of other reputable members at AVS, you really need to prevent the bass boost from entering into the 100-200 Hz region. Allowing that range to be boosted more than just 1-2 dB above the 1 kHz range will cause your speakers to sound congested and will also increase the level of the redirected bass going to your sub. More of the ugliness in the upper bass will be coming through the sub and it does not sound good. Overall, you will lose clarity.
The takeaway is that your bass boost needs to be done by 100-120 Hz if you want the best sound quality. Boosting the level of the subs only achieves this extremely well. I could try to perfectly craft a curve however it wouldn't change much, and because we're talking about a crossover and not a cliff, it still blends. My slope descends from 20 Hz to 120 Hz to the tune of about 8-10 dB, then drops another 2 dB by 1 kHz, and another 2 dB by 10 kHz. Outside of the bass region, this is the natural slope of neutral speakers in this room without EQ.
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