Sure. Basically one of the biggest contributors to quality bass is a smooth frequency response. Meaning there are no severe peaks or valleys in the measured response. If it’s not smooth, certain notes, or frequencies will be more pronounced while others will be lessened.
Here’s a basically flat frequency response showing that for the most part, everything played on this system should sound very even and smooth. These are generated by playing a “sweep” of frequencies starting very low(10hz) and going up to 200hz in this case.
This is another one showing an uneven response. For example look at the green line. That’s right at 50hz and every note, or sound at that frequency will be exaggerated while everything below about 45hz will be very low in comparison.
The biggest advantage of multiple subs is the ability to even the in room response.