kipman725 Posted May 21, 2019 Report Share Posted May 21, 2019 Long time reader, first time caller. In lots of the reviews the excursion capabilities of the drivers are stated E.G on the 2269H: It is a relatively quiet operating driver with more excursion potential than its looks suggest. It was pushed well past the 19mm Xmax rating and still seemed to be relatively clean at around 50mm peak to peak. How is this measured? I have some low cost drivers (Pyle plpw15d) with a stated xmax of 8mm, however the other T/S parameters were not correctly stated by the manufacturer. They seem to start making bad noises far beyond 16 mm peak to peak, the top plate looks to be about 6-8 mm thick (hard to get calipers in). I would like to have a better idea of the actual excursion capabilities for system optimisation as I am using 12 of these drivers but would like to re-design my system to use 16 of these drivers and need to do some thinking about whether its worthwhile and how much amplification I should apply before diminishing returns. I have attached a picture of one of my current subs, its a quad driver opposed sealed about 250L. My current plans are to use 16 drivers in dual opposed slot loaded magnet out sealed boxes that are sized so that using the quasi continuous full output of a NU6000 (60Vrms) they can reach 8mm excursion at 20Hz when wired as series parallel 4ohm loads (30Vrms per box). This change is mainly because the quad boxes are too heavy, I lose output over time due to driver heating and I keep having to un-bend grills. The main objective of the system is maximum output at 20Hz which for 8mm excursion should be about 120dB/1m/2pi (assuming I could locate the drivers in the same point of physical space). Quote Link to comment Share on other sites More sharing options...
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