Thanks Shady. I don't recall seeing and dips in that area but will check again.
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We get a lot of posts like this. Shady is right. There is a huge misconception that all bass comes from the sub. Actually very little comes from the sub. The bass decade reaches to around 500 Hz. I know it is now fashionable to call 200 to 500 Hz lower mid range, but that is semantic nonsense. If you play a speaker with a low pass filter rolling off sharply at 500 Hz, everybody who hears says it is bass, which in actuality it is. In fact the major bass power band is 80 Hz to 500 Hz well above where people cross their subs.
So slam requires superb integration of sub and all speakers. It requires adequate power bandwidth actually throughout the audio range. A big issue is damping. If the damping is not high enough you will not have slam. That means low Q alignments. If all those criteria are met then you have slam. To get what you want is not as easy as you think.
If you look at this lower trace, you will see the type of impulse response required for slam. This is a 2 meter response.
Now you can get two greedy with subs, as if you look at the response at the main listening position, this is what you get.
So you can see the bass was actually properly balanced, as there is in fact now a slight rise in response below 30 Hz. Even at the listening position the impulse response is still well preserved.
So yes, that has slam.
The point is you don't get what you want by adding more and bigger subs. You have to look at total system design and properly integrate all speakers. That gets progressively more complex as you add speakers. That latter response by the way was with all speakers driven except the ceiling speakers. So no aspect of a design can be considered in isolation.