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Old Today, 06:12 AM   #1
diyAudio Member
Join Date: Jul 2013
Default DML woofer questions

G'day DML enthusiasts. I've read nearly all the 'Piezo NXT-type panel' thread pages starting with Ziggy's about a decade ago. There are now some composite aluminium-polyethylene panels available cheaply (eg 2400x1200 Alupanel = AU$40), with thicknesses from 3-10mm, and even some composite aluminium honeycomb panels, commonly used in signage (6 to 25mm thick). Maybe better than panel like Gatorboard which has soft foam core?

Also, for CLS, in Oz you can buy these panels custom roll-curved to your specs, no kinks, for a nominal extra cost.

So, I'm thinking of experimenting with a largish DIY panel that can produce bass somewhat below 100Hz. I expect the answers may be 'try it and see', but maybe you can give me some starters.

Question: Some say 'heavier' panels produce lower bass. But, would aluminium honeycomb panel say 10mm or 20mm thick do so? Or would panel density be too low?

Idea: large panel about 2m x 1m, driven by 1-2 Dayton exciters (e.g. DAEX25SHF-4 Steered High Flux 25mm Exciter 20W) and powered by a plate amplifier (e.g. full range Dayton Audio MCA2250E 2.1 Channel Class D Plate Amplifier, or a subwoofer plate amp). The audio signal to the plate amp can come from the subwoofer audio output of my Yamaha amp, and crossover frequency can be set on either amp. If bass is OK, I might try including extra exciters and mid-high frequencies later, just to see how it sounds.

Questions: To those of you who have experimented, any suggestions about optimum thickness for an aluminium composite panel? E.g. 3mm or thicker? Or would thicker & stiffer honeycomb panel be better for bass? Or should I just use something cheap and dense like MDF board?

I realise someone may say 'just buy a cone speaker and stick it in a box with the amp if you want bass'. It may come to that, but not as much fun...
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