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Racetrack shaped drivers?
I have noticed that many drivers have a useable frequency beyond where you would usually cross them over at due to beaming. For example, a 4 inch driver may have a smooth frequency response up to 5 kHz or higher if the cone breakup is damped effectively. I usually would cross a 4 inch driver at or above 3 kHz in for a high performance loudspeaker design due to beaming – I like wide dispersion for stereo imaging.
I’m thinking about an MTM layout with a Hiquphon OW2 tweeter and a Racetrack shaped driver with an outside frame dimension of 126 x 150mm (W x H). A driver with these dimension would have around 77cm^2 effective cone area with a 28mm Voice coil and phase plug; which is 35-54% more cone area then a typical 4 inch driver. I would like to have a 2.6-3 kHz X-over point which the racetrack driver would have the horizontal dispersion to accomplish but would sacrifice some vertical dispersion and the vertical driver spacing would be more which would effect lobbing. The ideal driver would have a Qts low enough to achieve a closed box Qtc of 0.5 (critically damped). High pass filter 2nd order filtered at about 180 Hz Via electronic or digital means. A larger 8.5-10 inch woofer would be mounted lower on the baffle in a MLTL alignment and powered with a DSP enabled subwoofer plate amplifier. The racetrack drivers would only need about 3.5mm of X-max with 154cm^2 cone area to produce low distortion down to 180 Hz. I would probably mount the tweeter behind the baffle and have a 3.25 inch diameter waveguide to align the dispersion profile between the driver for more even power response and better driver offset time alignment. Except for the custom driver needed for this system to work what do you guys think of this idea?