Hi,
I just finished building a new pair of esl's. The first days they played fined. But one channel now has problems: it's diaphragm sticks to one stator. I can lower the bias voltage to solve this problem, but this costs me 15 dB sensitivity...
Sometimes the diaphragm doesn't stick to the stator and then everything seems fine.
I have to admit that I forgot to put small (1x1 cm) spacers between diaphragm and wire stators: in my previous esl's I put these spacers in the horizontal middle, every 30 cm vertically, to reduce the effective with of the diaphragm, similar to the silicone dots used by Audiostatic. After attaching the first diaphragm I became aware that I forgot to attach these "spacer dots", so I just tested the esl and it worked fine, until today, now one channel sticks to the front stator.
I'm wondering what can be the cause and what would be a solution? My own ideas:
* diaphram too wide in relation to diaphragm - stator distance: according to a Duch book about DIY els building, a max. ratio of 1:100 should be used for diaphragm width: my d/s is 1.7 millimeters, so 1.7 * 100 = 17 cm width is max. allowed width to get good static stability. But the book suggests to be on the safe side and use 1:70 which results in 12 cm width. My diaphragm is 23 cm width. Solution: put the small 1x1 cm spacers which I forgot in the middle of the diaphragm.
* diaphrahm tension: raise tension. I think this will be difficult. I didn't put much tension as I used ducktape to tension.
* too much difference between distance of stators and diaphragm. (asymmetry)
Any advice what to do and what would be the cause? I tend to remove the diaphragm and put the extra 1x1cm "dots" vertically very 20 or 30 cm.
I just finished building a new pair of esl's. The first days they played fined. But one channel now has problems: it's diaphragm sticks to one stator. I can lower the bias voltage to solve this problem, but this costs me 15 dB sensitivity...
Sometimes the diaphragm doesn't stick to the stator and then everything seems fine.
I have to admit that I forgot to put small (1x1 cm) spacers between diaphragm and wire stators: in my previous esl's I put these spacers in the horizontal middle, every 30 cm vertically, to reduce the effective with of the diaphragm, similar to the silicone dots used by Audiostatic. After attaching the first diaphragm I became aware that I forgot to attach these "spacer dots", so I just tested the esl and it worked fine, until today, now one channel sticks to the front stator.
I'm wondering what can be the cause and what would be a solution? My own ideas:
* diaphram too wide in relation to diaphragm - stator distance: according to a Duch book about DIY els building, a max. ratio of 1:100 should be used for diaphragm width: my d/s is 1.7 millimeters, so 1.7 * 100 = 17 cm width is max. allowed width to get good static stability. But the book suggests to be on the safe side and use 1:70 which results in 12 cm width. My diaphragm is 23 cm width. Solution: put the small 1x1 cm spacers which I forgot in the middle of the diaphragm.
* diaphrahm tension: raise tension. I think this will be difficult. I didn't put much tension as I used ducktape to tension.
* too much difference between distance of stators and diaphragm. (asymmetry)
Any advice what to do and what would be the cause? I tend to remove the diaphragm and put the extra 1x1cm "dots" vertically very 20 or 30 cm.
That's awfully close to the stator, no? I have Acoustats and the distance from dia to stator is around 5mm and they play LOUD. Width is 20cm and the 9" is 23cm. Won't the dias buzz against the spacers or are they fastened to dia and stator? How thick are your dias?
Hi, my diaphragms are 6 microns thick. I managed to fix the problem: I put small rectangular (0,5 x 1 cm) double sided foam tape "dots" in the middle of the horizontal aluminium bars that keep the wires of the wire stator together. This makes the diaphragm width to d/s-distance ratio lower: 1:72.
I managed to put more tension the diaphragm as well, resulting in better static stability.
I managed to put more tension the diaphragm as well, resulting in better static stability.