See my latest design in the PA forum. That uses a TPU rim that I glue the plate onto. Seems like results are much better than my efforts at clamping. They sound tighter than my clamped plates, probably since I reduced the dimension of the plate, and the TPU frame seems to dampen quite well but if feels like the plates struggle less and have better response down to 100Hz. Should have measurements and more details on the design soon.
I have a question for builders here. Have any of you experimented with modifying any of the Dayton Audio exciters which use either the triple outrigger feet or the quad out rigger feet and have cut the feet off mounting them using only the adhesive on the lip of the voice coil? If so could you comment on you findings, better worse or just different? I am guessing but it would seem these feet will provide an increase of coupling area between the driver and the panel. A similar effect could be to use a standard coin type exciter and mounting it to a reinforced section of the panel say a 2-3 inch circle coated with a full strength coat of PVA adhesive. While not exactly the same thing it is similar in that this helps the driver to push and pull more efficiently on a larger area of the diaphragm. thought and comments both pro or con are most welcome. Thanks.
Not tested but what I recall from my (full) reading of this thread and of the audio circle one is a general recommendation to not use the exciters with legs. I am not able to give a link to a post showing why...I think somewhere Steve explained how he dismantled his exciters.
The legs are linked to the exciter body so they create in my opinion a kind of a fix point closed to the voice coil. It is a solution to the problem of the magnet fixation but it probably changes a lot the panel behavior with as additional parameter the local mass added and the legs stiffness.
Hello moray.
All of my exciters I purchased over 15 years ago had the frogs feet( as they called them) which I had to cut off, including the casing.
They produced too much noise and was transferring that noise to the panel material.
I have had bad experiences with plastic encased exciters such as the hdn8, the exciter body should be as silent as possible and not be attached to the panel material, including the plastic or metal spider suspension which is attached to the coil former.
The 10watt Xcite xt19-4 has a plastic casing, which I am a little unsure of, but I am intrigued by it's long term power rating of 20watts ?
Has anyone had experience of this exciter and does it live up to its specification?
Steve.
All of my exciters I purchased over 15 years ago had the frogs feet( as they called them) which I had to cut off, including the casing.
They produced too much noise and was transferring that noise to the panel material.
I have had bad experiences with plastic encased exciters such as the hdn8, the exciter body should be as silent as possible and not be attached to the panel material, including the plastic or metal spider suspension which is attached to the coil former.
The 10watt Xcite xt19-4 has a plastic casing, which I am a little unsure of, but I am intrigued by it's long term power rating of 20watts ?
Has anyone had experience of this exciter and does it live up to its specification?
Steve.
I ahve a pair of theese DML like speakers in the basement. They sound horrible beacause of the styrofoam frame amd bracing on the back. I will dig them up an cut the frame and brace off and see how they sound.
If I remember correctly the panel is EPS with a centerdome made of some plastic metal foil mix.
Hello Pepe.
I have never seen this type of antique panel before.
It looks like a collectors item to me.
If you cut off the frame and brace that is supporting the large magnet, the heavy magnet will probably just fall off.
The eps looks like it is a very high density that has been moulded , similar to a chiller box.
Not the best of sounding materials I believe , from my experience with using chiller boxes.
Steve.
I have never seen this type of antique panel before.
It looks like a collectors item to me.
If you cut off the frame and brace that is supporting the large magnet, the heavy magnet will probably just fall off.
The eps looks like it is a very high density that has been moulded , similar to a chiller box.
Not the best of sounding materials I believe , from my experience with using chiller boxes.
Steve.