Paul W's 9 driver manifold, and other questions

[ross]

Hi all..

I was going through the gallery and came across Paul W's manifold and I have a question regarding this design.

With drivers on 3 of the 4 sides of the manifold, will this arrangement still cancel mechanical forces? I thought it had to be either 2 or 4 sides.

Also some other interests:

With the IB manifold being a 'hole' in the wall, doesn't this reduce (or even remove) room gain normally associated with dimensions as well as how solid/sealed the room is? Has anyone ever done a comparison of before/after ?

If the sub is crossed with a steep slope ~35hz, would one manifold perform well if placed in the front corner (or near the corner) ? The placement might not be on the floor, but more towards the ceiling.

cheers

[ThomasW]

Only opposition mounting of the drivers provides max cancellation of the mechanical forces.

There is plenty of room-gain from manifold mounted IB's, one only needs to compare nearfield vs listening position plots to see this..

A 35Hz XO point is a little low unless one has massively large main speakers.

Corner (aka boundary) loading boosts some but not all frequencies in the passband.