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. Above cumulative spectral decay. Above frequency response measured at 0. This is a 16 Ohm driver Re Above horizontal dispersion 0, 10, 20, 30 and 40 deg, off-axis. Dynaudio had the D52 and mid-domes and used them extensively in their commercial products. Unfortunately I do not have two of this to test in a classic 3-way and evaluate against e.
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As can be seen, double suspensions secure stable positioning of voice coil in magnet gap. The lower plot displaying the resonance at Hz, not something that should bother even with a 2nd order point of crossover at 3 kHz. Today we see a couple of 2″ and 3″ domes from China and rather recently reintroduction of 3″ domes from ScanSpeak.
Apparently no symmetric driver is incorporated here to reduce impedance rise towards higher frequencies. With an assumed point of crossover around 3 kHz, this is just excellent.
Green is 2nd and blue is 3rd. Above impedance plot with a 50 Ohm scale. Now, this is an unusual smooth frequency response, all the way from Hz to around 3. Not a trace of unrest from to Hz. Above horizontal dispersion 0, 10, midranve, 30 and 40 deg, off-axis. Probably not as nice as this. Based on simulation it seems a 2nd order afc filter produce a 4th roll-off, and at the top a true 2nd order low-pass filter can be achieved.
Above the midrange crossover based on simulation. Measurements Above frequency response measured at 0.
Used atc midrange for Sale |
Dynaudio had the D52 and mid-domes and used them extensively in their commercial products. Maybe double laser interferometry could shed light on the issue, but until now it remains unsubstantiated claims.
Not cheap at all.
I think the claim has come due to ATC introducing double suspensions for their 3″ dome and people thinking this is good and all other single-suspension domes must be bad. Two ways of doing the same thing – and in the end a matter of taste.
Would be nice to have two samples, but what I found is well in accordance with other tests of the same dome.
I tried the Vifa 3″ dome back then and never liked it much. This dome should be well suited down to Hz. Let’s expand this graph some closer scrutiny.
Unfortunately I do not have two of this to test in a classic midrwnge and evaluate against e. How the driver behaves on a narrow baffle I can’t tell.
Soft Dome Mid-Range | ATC Loudspeakers
Hard to do a full test from either added mass or imdrange volume. Wonder how it would sound. Large midrange domes are claimed rocking in the magnetic gap 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.
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. Mdrange a middome adds considerably to cost and crossover complexity.
Soft Dome Mid-Range
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. Above impedance plot displaying a huge mifrange at Hz. TS data retrieved from the impedance plot. Some break-up modes appear around 4. Piece of cake really!