For those that visited the Fernie room and didn't get what we were trying to do and anyone else who might be interested in what we were trying to do:
We were trying to reduce the 57 beaming and increase the stereo sweet spot. With the added benefit of the increased panel area from the 4 Quads to enable the electrostatics to be used in a large room.
PaulR's concept was to turn the speakers onto their side. This changes the treble panel from being horizontal (cause of treble beaming) to vertical (horizontal beaming). With 4 speakers in a line then there is a continuous treble beam across the room, thereby eliminating the vertical beaming (but likely to cause some comb filter effects). With the signal being processed by Foobar it was possible (Paul wrote a DSP plug in to do this) to output 4 signals, for the 4 speakers, each one having some left and some right signal. The extreme left speaker having mostly left, with the inner left speaker having more left then right. Vice versa for the right hand side. Thereby in theory increasing the size of the stereo window. We also had diffusers / absorbers behind each speaker to disperse / reduce the size of the audio signal that would be reflected around the room and potentially affect the sound adversely.
The painting stands from Screwfix plus some wooden planks got the 57s to an ideal height for the seats, so that the listener's ears would be well within the treble beam. With the distance to the speakers being enough that at the back you could stand and not hear any dullness as you were still well within the treble beam.
There were definitely good seats to sit in and the further back you went, the wider the stereo image became. So based on our listening and comments made it seems to have worked, but it isn't really going to be a practical solution for anyone!
We were trying to reduce the 57 beaming and increase the stereo sweet spot. With the added benefit of the increased panel area from the 4 Quads to enable the electrostatics to be used in a large room.
PaulR's concept was to turn the speakers onto their side. This changes the treble panel from being horizontal (cause of treble beaming) to vertical (horizontal beaming). With 4 speakers in a line then there is a continuous treble beam across the room, thereby eliminating the vertical beaming (but likely to cause some comb filter effects). With the signal being processed by Foobar it was possible (Paul wrote a DSP plug in to do this) to output 4 signals, for the 4 speakers, each one having some left and some right signal. The extreme left speaker having mostly left, with the inner left speaker having more left then right. Vice versa for the right hand side. Thereby in theory increasing the size of the stereo window. We also had diffusers / absorbers behind each speaker to disperse / reduce the size of the audio signal that would be reflected around the room and potentially affect the sound adversely.
The painting stands from Screwfix plus some wooden planks got the 57s to an ideal height for the seats, so that the listener's ears would be well within the treble beam. With the distance to the speakers being enough that at the back you could stand and not hear any dullness as you were still well within the treble beam.
There were definitely good seats to sit in and the further back you went, the wider the stereo image became. So based on our listening and comments made it seems to have worked, but it isn't really going to be a practical solution for anyone!