I think we're on the same page. To me, the larger scale items seem interesting from a perceived frequency balance standpoint. I.e., the wide depression from roughly 200 to 1500 Hz, followed by the peak from 1500 to 3500 Hz (frequencies open to interpretation depending on how you look at them). Their magnitude isn't huge, but combined with their width they're likely making the speaker sound detailed, but lacking warmth/guts in the lower vocal range.
Do you have a means of measuring electrical impedance and phase? If you do, that data can be used in typical crossover simulators if you want to model the low voltage side of the transformer interface. Combined with the acoustic measurements, that should get you to a usable simulation without being able to fully model the transformer and high voltage side. At least I think it will. I've done some basic sims like that, but haven't done enough real work with them to guarantee it.
Sorry it took so long to reply, I completely forgot I was going to look into this. It appears that the damping screen is 200 mesh (200 line/inch). Here's a picture, it's a little hard to see because the millimeter rule is out of focus and I'm taking the picture through one eyepiece of my stereo-microscope. 200 mesh is nearly 8 lines per mm.
Sheldon
Sheldon
Just another update:
I'm in the process of acquiring a CLIO Pocket system for performing more thorough measurements at home. This is how I tried to justify getting a CLIO Pocket system (though it's quite reasonably priced already, at a few hundreds USD--more affordable than many audiophile accessories):
Given that we already have the powerful free software tools such as VituixCAD, Xsim, XMachina, etc. (huge thanks to the brilliant and generous creators!), and also the possibility of configuring a poor man's Klippel system (thanks to that thread), figuring out a crossover on the primary side of the Acorn's step-up transformers that addresses most of the issues encountered is likely just a matter of time.
As for placing the crossover on the secondary side of the step-up transformers, per Quad, I would still need to figure out how to properly measure and model the diaphragm of electrostatics. Wondering if anyone has already studied or done it and could shed some light on the subject?
I'm in the process of acquiring a CLIO Pocket system for performing more thorough measurements at home. This is how I tried to justify getting a CLIO Pocket system (though it's quite reasonably priced already, at a few hundreds USD--more affordable than many audiophile accessories):
- An analog microphone (vs. the miniDSP USB microphone I have been using) will be needed to use REW for certain measurements (where latency matters) anyway. The CLIO Pocket comes with one.
- The CLIO Pocket workflow appears to be pretty streamlined and is well organized/documented. Measuring RLC components is also a handy feature.
Given that we already have the powerful free software tools such as VituixCAD, Xsim, XMachina, etc. (huge thanks to the brilliant and generous creators!), and also the possibility of configuring a poor man's Klippel system (thanks to that thread), figuring out a crossover on the primary side of the Acorn's step-up transformers that addresses most of the issues encountered is likely just a matter of time.
As for placing the crossover on the secondary side of the step-up transformers, per Quad, I would still need to figure out how to properly measure and model the diaphragm of electrostatics. Wondering if anyone has already studied or done it and could shed some light on the subject?
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