You really are bang out of order mate.
You contacted me asking for advice as to how best to go about driving these batpure super tweeters. I explained that it was not as simple as it may seem and outlined various issues and how best to tackle them and you then left me believing, after further emails and PM's, that you intended to commission me to carry out this work. One of the major points I put forward was that it was maybe less than optimal to put the capacitive reactive load on to your main amp as it could potentially spoil the audible range treble. I suggested a separate amp as it would also allow the volume to the batpures to be adjusted to fit in with the main speakers, and advised that a chip amp of a low power would be appropriate as it should easily handle the job and it should keep it cheap. You asked about a class D Tripath amp you already had and could you use that and I explained that it was not suitable due to it being class D. You then sent me photos of the class D amp you had already had made up by someone and asked me if I could re-use much of it in building you a new chip amp amp for the batpures. So I spent a while studying it, and said yes but the chip amp would need a lower voltage secondary transformer. I even, in good faith of the work coming my way, went on ebay and checked out Chinese made boards with LM3996 amp chips (which I had specifically recommended as most suitable), and found a specific board which seemed ideal for the task.
This amp was to be used via step up auto transformers I was to design and build..(or so I was invited to believe)... There is I believe a version of the batpures, at a much higher price, with suitable transformers built in, these come back into the story later....
Yes I went to great lengths to explain that to the best of my knowledge there were no published examples of previous DIY etc versions of what I was suggesting as the optimal solution and so, as I was having to do everything from scratch, and you cannot hear or reliably measure 30KHz + sound, whilst I would use best possible practice, precisely this solution has probably never been done before and so I couldn't
guarantee 100% success. It would certainly have been infinitely better than any of the methods you were going to try without my advice and
probably as good as the factory version.
And on we go with me led to believe you were assembling all the bits such as the chip amp boards from China... and then,
only 10 days ago or so, asking what transformer to order to go with the boards...(
) and expecting to hear that you've got the bits together to send me so I can build up the chip amp (a "gain clone") with the transformer I recommended and the boards I'd recommended and your old class d amp as a case donor... and then build the auto transformers to match....
Next I hear about is today, this thread. Without further contact, not a thanks, not an "I've found a new solution sorry for the hassle"... you've used my idea of the separate amp with it's own gain control, the boards I recommended, even the transformer you asked about only 10 days ago, and obviously either managed to do the work yourself or get a mate to do it for you, and scored some second hand batpures with the built in transformer so no longer needing me to wind the transformers for you....
All the emails answered and advice given in good faith. Time spent working out how best to do this job. Time spent searching on ebay amongst all the possible chip amp boards in order to suggest which to order, even coming back to ask mains transformer specs etc... Not even a PM or email of thanks or of "sorry I won't be going ahead with the work"
Very shabby, to say the least.