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Thanks for sharing the picture. Looks nice. So do you have one exciter on each of the four floating panels? Are all full range?
Neat. Thanks for claifying. There has been some discussion on multiple smaller panels like this but I haven't heard of anyone tried it before (Or I forgot from the long thread). Often the recommendation is large panels are good for bass, but your set up proves small ones works as well. Did you ever compare the souND from your smaller panels with one larger? I'm curious to hear what your impression is. Not as wide and large would be easier to place in the living room plus it looks better imo when the panels are not too large (like the big ones I have currently)
With all due respect, I really think putting a hole in the panel convolutes the basic NXT technology."Any" plate connected to the exciter will function as a low pass filter to some degree. Now that we're seeing exciters that handle more power, I see nothing wrong with adding a little high frequency EQ. Sooner or later materials used by professionals will trickle down to DIY.I haven't been on here for a while, but I thought I'd share a photo of something I put together a few years ago. It uses low power exciters, mainly because there was nothing higher wattage available at the time. I used corrugated plastic panels floating in four separate frames and EQ'd the high end. Bass was very substantial to 50 hz, and sounded pretty nice on a wide variety of music.
Now that's what I'm talking about! Good looking panels... what are the dimensions??
This is where I plead "guilty"!The panels are 12x12 inches, the frames are made to allow a 13 inch opening per panel. I know.......I know, no golden ratio! Guilty on the first count. Also the exciters are mounted dead center, guilty on the second count.There was nothing all that technical or arbitrary about panel shape or exciter placement. I simply ran pink noise into test panels of various shapes and sizes and tried moving the exciter around until the spectrum analyser showed the flattest response. The center was also the spot that sounded best to my ear.How many loudspeaker "designers" have achieved their goals through empirical means? Plenty, I'm sure!The exciters are freely mounted, no individual or common spines were used.
If you check some of the recently linked technical papers you will find the theory that confirms some of your findings regarding weight and suspension. Perhaps can give you further clues to help optimize your design. Will take a peak this weekend if I can find the particular paper I'm thinking of. I think you can get both low and high frequency with the right design. Efficiency is another matter...
I really like the tall and thin and surprised by the bass response! Imagine they are efficient as well.One of the first panelsi built were square and they sounded very nice. According to one of the papers very close to square is optimal for the most efficient generation of nodes so given that and what I heard with my ears a square panel is not terribly off the mark it appears.In regards to exciter placement Monacor placement is probably best however with my array I do plan on moving excites to different positions on the panel to randomize the freq. response somewhat for what I hope is an overall smoother summed response.Again, thanks for the pics and explanation!
Hey Capin'Yeah, I'm not a proponent of multi exciter panels. 1 exciter per panel is why I want to create a thin tall panel for high output and ability to EQ with the extra available power handling. I mention Monacor as I am planning to distribute the exciters in different positions on each panel to randomize the FR so given the 4 panels the overall FR (I hope) is smoother. That is the thought anyway, we shall see if the theory proves out. Funny your wife doesn't like the thin and tall look... I think that's a really nice look and should provide a focused array at most listening distances I would think. Will probably have mine pulled a bit off the ground so the center of the panel is about at the listening height to maximize the distance that you can listen to them in the focused (line) array... really like listening to them as a line array... always imagined that was one of the contributing factors of why the guys like the bigger panels(!?!).
Yeah, I'm in the same position as you really. The size of my room isn't bad but just no good spot to set up a nice audio system so at the beginning I was interested in these as they are light and could be picked up and moved to a closet or some other spot. Funny, I'm shooting for a MMG or Eagle look as well. We should be able to do this without to many problems I would think!? I'm going to use black ink in the PVA:water treatment, paint the frames black and use grill cloth to cover everything except the sides. Still deciding on whether to use natural wood sides or also stain them black. I like wood but the all black look pretty killa.The Eagle's are also very nice looking.I think where I made my mistake was choosing white for a color, it stands out like a sore thumb. Black would have been the way to go, more dramatic yet understated.I get so wrapped up in the R&D of speaker building that all of my prototypes wind up looking like ,well............"prototypes". For me the best thing about quality DIY is that the guy down the street isn't going to be able to walk into a big box store and buy the same thing you have.
Same... I'm more interested in the next build instead of finishing the existing design. But that is where the fun is... fun to build and try different things.