Hi TCARCIO, all
Go ahead and assemble the kit as per the instructions.
If you wish to add more absorption as a couple people are experimenting with, wait to see what the outcome is and if you choose to add more, it goes where it is most effective, in the area in front and behind the drivers radiator and at the mouth if desired.
What would be of more concern is properly equalizing the system in your room.
In larger scale rooms where most of our products go, eqing the system is a normal part of the system alignment.
In a living room, one is dealing with the lowest strongest modes and so what one measures at the listening position is the speakers response added to the rooms transfer function.
The REW software that has been mentioned here is close to a miracle tool for home bass eqing. I can derive an eq curve or peq settings with a program I use for crossovers but I need the response curve file as input.
The REW program seems to combine these steps so it makes sense to use or at least investigate.
In the commercial sound / recording industry, there are a couple useful rules about eq to keep in mind. When a system is minimum phase (has a phase response which changes according to changes in amplitude response), then either a peak or a dip in response can be flattened with proper (complimentary) eq.
In this case, the fix is total, one complimentary curve can off set another perfectly, consider the old RIAA curve applied to records covered most of the bandwidth.
If you measure a woofer's response outdoors, this is what you see, a minimum phase response.
Anything you see here if fixed in amplitude will also be fixed in phase.
For designing the crossovers for the speakers at work, I raise them up on a tower in addition to a TEF machine to minimize the sound, which did not originate at the speaker.
I don't want / can't have anything other than the first arrival direct signal, what the speaker is doing.
Add a room and now one has a mixed system. A notch, in fact most notches are caused by a reflected signal returning and arriving out of phase (a delay corresponding to 180 degrees of phase), which cancels out the source.
These aberrations CAN NOT be fixed with eq and if your try to fix the amplitude response with a boost, you will be screwing up the phase response.
Thus, in room or live, one should not try to lift up obvious nulls even if an RTA says it's working.
Notice in some rooms, there is another way to get a null which is a resonant absorber such as a diaphragmatic wall or un-intended Helmholtz resonator.
Once your below the lowest room mode, then it is ok to apply lift, you are out of the range where you get reflections etc. The only down side of boosting is that say a +6dB lift at some point means that with a flat spectrum signal, that boosted range will reach amp limiting at 1 / 4 th the power of everywhere else.
Hope that helps,