Based on simulation it seems a 2nd order high-pass filter produce a 4th roll-off, and at the top a true 2nd order low-pass filter can be achieved. More on this from the cumulative spectral decay plots below. Apparently no symmetric driver is incorporated here to reduce impedance rise towards higher frequencies. I’m almost glad I don’t, because it takes a damn lot of work to do so, and we may end up thinking we compare apples and pears. Green is 2nd and blue is 3rd.
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Green is 2nd and blue is 3rd. Above impedance plot displaying a huge peak at Hz. Above frequency response measured at 0. Wouldn’t the ScanSpeak 12MU do just as well? This is a 16 Ohm driver Re How the driver behaves on a narrow baffle I can’t tell.
Above the midrange crossover based on simulation. I tried the Vifa 3″ dome back then and never liked it much. This dome should be well suited down to Hz. This is nidrange huge transition! Would be nice to have two samples, but what I found is well in accordance with other tests of the same dome.
Having a middome adds considerably to cost and crossover complexity.
Above horizontal dispersion 0, 10, 20, 30 and 40 deg, off-axis. Let’s expand this graph some closer scrutiny. I’m almost glad I don’t, because it takes a damn lot of midrannge to do so, and we may end up thinking we compare apples and pears. At least from simulation from the large baffle.
Wonder how it would sound. Now, this is an unusual smooth frequency response, all the way from Hz to around 3.
Soft Dome Mid-Range
More on this from the cumulative spectral decay plots below. Measurements Above frequency response measured at 0. Baffle 60 x cm, driver placed 40 cm from top.
Why they have gone out of fashion is a good question, maybe because 3-ways generally got out of fashion and thanks to D and other excellent dome tweeters, 2-ways took over although never able to deliver the same smooth transition between a 6″ or an 8″ midbass driver and the dome. Hard to do a full test from either added mass or added volume. Above cumulative spectral decay.
Two ways of doing the same thing – and in the end a matter of taste. The lower plot displaying the resonance at Hz, not something that should bother even with a 2nd order point of crossover at 3 kHz.
Large midrange domes are claimed rocking in the magnetic ztc due to the single suspension, but I’ve never seen any proof of this – and it would probably be very difficult to do that test. With an assumed point of crossover around 3 kHz, this is just excellent.
Soft Dome Mid-Range | ATC Loudspeakers
Above impedance plot with a 50 Ohm scale. Probably not as nice as this. Not a trace of unrest midraange to Hz. The good question is what a 3″ dome has to offer against a lot of really good 4″ cone drivers available today? Today we see a couple of 2″ and 3″ domes from China and rather recently reintroduction of 3″ domes from ScanSpeak.
I’ve always found it strange to combine two 15″ drivers with a single 3″ dome as done by ATC in their larger studio monitors. Piece of cake really! Apparently no symmetric driver is incorporated here to reduce impedance rise towards higher frequencies. Distortion measured at 2.