That will give me wider view on my next approach of future speaker cab in my home outside the states. I just want to use the simplest like 1 cabinet per channel and no subs. In my living room its 625 sq. ft. and I'm using a klipsch 8 inch tower and its just perfect for my listening. I like the speakers to work at its full potential so it works out on low and high volumes.
In my home overseas my listening area is 985 sq ft. its kind of long ways. I'm not so sure if its a toss between a 12 or 15 inch speakers.
The reason why I said 15 inch, because in my younger days, I use to make custom boxes and install car stereo. I have made maybe over 400 boxes. The one that I really like the sound the most is either 8 or a 15".
I was thinking if the the 15 inch is too big for a 1000 sq ft, I might have to design a band pass box or a different order.
I think I remember now the sound of a passive radiator. I just havent made one since the late 80's.
Anyways thank you for the follow-up.
CCG