By having it tuned around 30Hz, you create an out of phase response from around 33hz-70Hz, but this can be adjusted by putting the port on the side and sub to the back or on the top. So, I will not argue that a lower tuning will still work with this driver, but I want to show you something.
This first image is the phase of the [email protected]
Everything is explained in the pictures. This is to compare my recommendation with the others.
The second one is the phase of my [email protected]
lower tuning preference.
This third one, is your [email protected]
Notice the out of phase band. This will effect low end but you will not notice it due to tuning. In this example, tuning is a "fix" for lost output. Not something I want to deal with when designing. I do not hide output loss. I correct it.
The one above shows the responses of my [email protected]
, and your [email protected]
You do get output increase below 35Hz with your tuning, but this will change with acoustical loss from phase output, and also my response is an average of 2-3dB higher in the rest of the response.
This last one adds my [email protected]
to show the output comparison to your [email protected]
Also, the Group Delay is decreased by 14% by going from [email protected]
to [email protected]
It goes from 70 msec peak to below a 60msec peak. Also, it gets rid of the peak just above 120Hz.
This is just to show the given against my recommended. Not to start any preference wars. I just need to show you that there is a reason for my recommendations, and I do not disagree with any other of your guys' recommendations either. If they work for you, they work. That is perfectly ok. :D