Originally Posted by Madaeel
Simply because there isn't a seat on the couch that doesn't have 2-4 drivers behind it. When my bro and I demoed the 8 subs in the same cabs I have now we were both sitting on the same couch roughly 3ft away. When we played each individual sub at a time whatever sub was behind us was felt much more then the one behind the other.:
That’s precisely my point. No matter where you sit, there will only ever be 2-4 driver firing into your back, and the rest just goes past you. With ” the manifold nearfield” design you can have 4-8 firing into your back. You focus the soundbeam.
When i measured my DO sono’s close mic, the dB was the same everywhere within the endplate and driver. Not until i moved the mic outside of the driver surround did it decrease. I seem to remember reading the same about the IB manifold, as long as the mic is inside the manifold, it is practically close mic. Measure a normal sealed sub close mic, and then move the mic 1 inch !! away from the cone, and the dB goes down.
In my case i have a two seat recliner couch with a angled centersection, so only two MLP’s, so if i build a box for each seat with two rows of three drivers in each(6total), the ”pressure wave” will be spread out from an area of ca 3 ft wide by 2 ft high(3x12”wide and 2x12” high)= 6ft2.
If i mount them in a manifold 1 ft wide by 2 ft high by 1 ft deep(2x12” on the left wall, 2x12 on the right wall and 2x12 on the back wall), the ”pressure wave” will now be concentrated in a 1x2 ft area=2 ft2. Place that opening of the enclosure precisely behind each MLP, and you simply focus the beam to each seat.
You know: Shock Wave
Anyway, i’m just speculating here.....