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I currently have them on 2.5 x 5ft birch panels. One has thickness of 1/8, which doesn't sound too good, and the other has 1/4 thickness. BTW: Here are some measurements of the XPS panels. Shows similar fall-off on the LF as the ones you posted - birch panels shows a much smoother LF, but the XPS has better and tighter high end. Mic at 3 ft (used the umik-1) - the lines shows the same panel but just with different smoothing applied. Probably can't read too much into the chart because it is measured in my unfinsihed basement with concret floor, misc stuff and other reflective things.
Since you asked...here are some comparisons between 2.5 x 5 birch panels with thruster exciter (purple) and 2 x 4 XPS panels (green) (re-coated with cheap exciter). Same measurement, just different smoothing. Panels measured at the exact same location, stand and volume settings. It's pretty obvious which area each panel excels. Exciters attached with VHB tape since I didn't have any good glue at home. Birch panels sanded down to 200 and as an experiment I put some diluted pva glue about 5" diameter around the attachment point for the exciter. This and the fine sanding helped smooth out the mids, added the bump between 3-4k, and the two smaller peaks over 10k. The unsanded/treated birch panels barely moved the needle above 8k. Next step is to round and taper the edges a bit more, which I hope will help smooth out the 10k dips. It made a lot of impact on my smaller birch boards. May also re-skin the whole front. If you compare the XPS line in these charts vs the one I posted before (which only had the pva applied to the backside), you can see the difference in HF around 20k Hz. Since I have little clue what I'm doing when measuring, and my basement is not the best measurement place, one has to be careful to not draw too detailed conclusions from it.OB_Newbie - play around with dampening on your panels either by tape, Sedge pva/shellac method, cedar rings, moongel or whatever you have at home, where you lean/attach suspension points. It makes a huge difference regardless if you suspend the panels or have them standing. It will help smooth out the response especially in the LF but also in some other regions. You may be able to eliminate or move the dips/peak around 62.5Hz.
How small?
The one thing that makes this so rewarding is that it is so easy to experiment and then immediately knowing the result.
Oral3I only used one exciter per panel and they could get too hot to touch ,are you still using four exciters ,if so what positions?Steve