0 Members and 1 Guest are viewing this topic. Read 639550 times.
I watched that video several times over the past few days. The presenter went to great lengths to illustrate his findings.I started playing with DML's after reading the late Zygadr's original post in 2009.He had such enthusiasm for his new found project, I couldn't help but get involved and became a believer.So, 9 years later and I'm still messing with these things on and off. I still don't have them figured out, but I did accumulate some observations over the years.First of all, one exciter on one panel seems to give the most predictable results.My first pair of working prototypes consisted of cheap, low power exciters I bought in bulk from Parts Express.I constructed frames with 4 sections, the panels were 12x12 inches and mounted into each section with duct tape.So, with one 5 watt exciter per panel, I had a 20 watt power handling speaker.I crossed them over at 150 hz 4th order hp filter and used a subwoofer. If you're hoping to get tactile bass with a very large panel driven by multiple exciters, forget it. It's not going to happen!Getting back to that video.In the second half he shows resonant nodes with suger and how the pattern changes with frequency.I recently ran pink noise through a panel and observed it with a spectrum analyzer.At one meter the spectrum analyzer shows a fairly predictable pattern. What I found interesting was that bringing the test mic within an inch of the panel, and moving it around the surface, showed definate signs of considerable comb filtering.1/6 per octave looked like the teeth on a saw as the mic was moved around.Here's the thing about that. Do the nodes and comb filtering combine in a predictable caos as distance increases?I don't know, I'm not a physics expert.Demonstrations have shown that DML's are nearly immune to feedback and stereo imaging can be heard and appreciated in very large venues.Tonewise they done sound as good as my Magnepans, but they can be very listenable. They seem to shake off inter-aural crosstalk and display a certain headphone kind of separation.As for a sweet spot, it seem to be there the minute you walk in to the room where the DML's are playing.Still, very interesting!
Page created in 0.041 seconds with 27 queries.