BobZ
Went to see the Ohm speakers
http://www.sitesandsounds.us/eze/eze5/items/ohm_lined-up-walsh-small.jpg and what can I say? The grids are all square, identical to the new squared ERR grill.
Upon aesthetical comparison, the (RL's) cylinfrical grid wins by far regardless of the base shape and in my view reinforces the
radial concept, but of course our difference here is entirely subjective and purely aesthetic.
I would agree in that the radial's pyrami-ed base shape looks (and pbbly sounds) much better than any Ohm base shape.
On the baffle step question, there are good sources of detailed info. I liked:
http://www.speakerdesign.net/understand.html or
http://www.t-linespeakers.org/tech/bafflestep/And with the risk of going off-topic here, a few guidelines have helped me when judging spkrs enclosures baffle step wise:
-Open air mid-high spkrs are sort of ideal, even better than infinity designs (a driver mounted on a big wall) mainly because additional to the baffle step where there are diffractions that add (and then not) to the original sound waves, the open design does not suffer from surface/size derived diffractions.
-As on a river, different velocities of the water running near and far from its sides, interfere with each other, the actual box edge form is important and thus roundovers or curved angles have been sprouting on leading brands (B&W comes to mind) to reduce cabinet edge diffraction.
-Spkrs boxes are better thin than fat, ideally not thicker than the width of the driver itself. If you want SPL it would be better to build taller rather than fatter boxes.
I assume the IT enclosure theoretically regulate Bass response (increase) so it would compensate BStep.
Nevertheless in the broad perspective, I've always considered the radial driver design a good advance in the quest of better wave radiation.
Radial loudspeakers particularly in the ERRs pyrami-ed cabinet look like a new point of design in this quest... Yes, the waves move vertically here, but this actually helps eliminate the floor as another source of wave interference. (
This is why always thought of Steve's radial drivers as perfect for Low freqs... but this really is off-topic). Hope it helps.
Nacho