Brent71
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- Nov 22, 2019
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D'Appolito design requires 3rd or 4th-order crossovers.I was quite interested in the Dunlavy speakers, back in the day. They used cheapish VIFA drivers that I used in a couple of designs I was working on at the time. They were using the D"appolito configuration (Dome tweeter in the middle, a midrange both above and below as well as woofers above and below the midranges. The crossovers were first order, so measurements would be poor in some locations but superb in others. Used in a large room so you could be a good distance from them, they blended well and sounded good. Luckily the drivers were a mineral filled polypropylene that rolled off smoothly so the first order crossovers were adequate
John Dunlavy used only 1st-order crossovers, stepped baffles, and sealed enclosures, because it's the only way to get near-perfect step and impulse response; 2nd-order and steeper crossovers store energy and cause poor step and impulse response; ports cause the Q to go sky-high.
Dunlavy SC-VI step response. This shows how nearly perfectly time-aligned they are at a listening position of 10 feet, and it's a 7-driver speaker; really impressive!