Originally Posted by bigzee3
Forgot to ask do I need to rerun Audyssey if I change modes. Also I know you mentioned using the Music preset for movies. When using the music preset do you need to back off your sub volume or adjust the gain in AVR or is that just an add on to your normal settings.
Let me start with the first question, which is actually more complicated than it sounds. The correct answer is yes, you should rerun Audyssey if you change modes. But, there are circumstances where I wouldn't do that. Audyssey's goal is to produce a flat frequency response, down to the point where your bass frequency response rolls-off by 3db. Below that F3 point, Audyssey will no longer set control points to correct dips or peaks.
But, in-room, there really shouldn't be any dips below about 20Hz, even in a fairly large room. By the time your frequency response is below 20Hz, in most rooms, you should no longer be dealing with room modes, and you should only be getting pressure vessel gain. You can read more about that, including how to calculate room modes in your room, in Section VII-B of the Guide linked below.
What is more likely, depending on the size of the room, of course, is that Audyssey will be pulling-down room-induced peaks below 20Hz, rather than trying to pull-up dips. So, if you want a low-bass rising house curve (like a Harman Curve) Audyssey may actually be working against you a little in that respect. A way to get around that is to run Audyssey in the Standard 20Hz mode, and then without rerunning Audyssey, switch to the 16Hz Extended mode.
Being able to actually measure your frequency response would be beneficial and if you did, what you should see and hear, is that you have more <20Hz SPL when you do this. The reason that this works better in a smaller room than it does in a large one is because the smaller room has quite a bit more room gain to contribute <20Hz than the large room does. So, room size is definitely a factor in determining how well this method works, but it is certainly something you can try.
I didn't actually like the 2.2db boost, centered on 63Hz, baked into the Music preset. Instead, I use a technique called cascading crossovers that I like much better. That also provides a little more emphasis to the <80Hz frequencies, but it is a broader, more global emphasis that I think is much smoother and clearer. Section III-C explains cascading crossovers in detail, if you are interested.
If I were using the Music preset, though, I would just be governed by what I heard. If I felt that the bass were a little too loud, I would back-off the trim level a little. Understanding where in the frequency range you want to add bass emphasis is important, because that helps you to understand what techniques or settings you need to use to achieve your personal goals. And, those goals may vary, depending on the specific program material you are listening to, or depending on your own bass preferences in that particular listening session.
The very best advice, in my opinion, is to be willing to experiment to discover what works best for your room, your audio system, and your personal preferences. And, for some people at least, it's not just program material that can vary. So can our bass preferences, depending on our moods, or circadian rhythms, or phases of the moon, or whatever.