The woofer has fairly wide dispersion which then narrows above 1k. The waveguide and compression driver combination narrow their pattern gradually towards higher frequencies. A robust compression driver which can run below 1k has been chosen, to allow freedom with the crossover. This makes the smooth handover shown here possible. Some beaming is shown around 15k, meaning there will be some loss of high frequencies radiated to the room. This is not a big issue.
S3 measurements confirm very good dispersion control. Constant directivity has been achieved and pattern control has been maintained down to the Shroeder frequency of typical listening rooms. The - 6 dB line shows the nominal coverage angle - in this case 80 degrees nominal (or 40 degrees from the central axis as shown on the sonogram). The results have been gated and normalised. The floor reflection has been gated out and normalisation adjusts the axial measurement to a flat response. As a result, the sonogram shows dispersion rather than frequency response. One could achieve a similar result by using EQ to get the axial response flat, but this method is much quicker.
The vertical coverage is a little narrower than anticipated and this is a matter for further investigation. My initial supicion is that the dip around 5.5k may skew the result.
What is particularly pleasing with this result is that the beaming often seen before pattern control is lost on the bottom end, has been eliminated.
The bass is handled by 2 10" Woofers per side, custom made by Acoustic
Elegance in the United States. They are aided by a pair of 15" passive radiators
Passive crossovers with low DCR custom made inductors and wirewound
resistors make it all sing, with a rated sensitivity of around 90db 1w/1m and
power handling well in excess of 400 watts they get LOUD.