If I´d use the W15gti e.g. the 2256g, 3cubic feet is almost close to Q= 7 in a sealed enclosure. Would there be a benefit in building a larger, sealed enclosure for these drivers?
I will locate the mono-sub very close to the mains, so locating-issues aren´t that dramatic.
I would propably use a lowpass at 80-100hz due to two facts:
- My main speakers (using E-145) start to roll-off gently at ~100hz
- every Filter creates some kind of group-delay and it gets worse the lower the filter is set
A 80hz lowpass-filter generates less group-delay than a 50hz lowpass-filter, resulting in a more time coherent system.
(I´m not using a DSP, so no way to set delays on the mains etc...)