I cant reach above 15Khz on my planars

[WrineX]

Here bolserst


my cal file of the new mic

 

[RogerGustavsson]

Thanks for sharing your experience. I've often wondered about this aspect of planar magentics where there is often a significant portion of undriven diaphragm area that is just "along for the ride".

For lower frequences, there is a elasticity needed to allow for larger deflections. If the plastic film is largely overed with aluminum foil, it will reduce the ability to excursion for a non-pleated diaphragm.

 

[lowmass]

For lower frequences, there is a elasticity needed to allow for larger deflections. If the plastic film is largely overed with aluminum foil, it will reduce the ability to excursion for a non-pleated diaphragm.

Good point. In general though a panel doing lower freqs will be quite large so this potential problem doesnt seem to be an issue.

I have built a number of basic panels with the foil traces running BOTH ways. The results were the same.

Another case in point, the Apogee base panel has its foil traces running horizontally AND they are under tension in that direction. Meaning across its width there really is no breaks in the foil. Similar to no traces at all, yet it works.

 

[WrineX]

Also a magnepan foil is tensioned REALLY really hard. to the brink of destruction. if not tensioned you get the comb filter i showed. so as much tension is needed as possible , enlarge the panel to get lower res.

 

[bolserst]

my cal file of the new mic

Thanks! 🙂
Wow, that is impressively flat.
Almost don't need to use the Cal file at all.

 

[WrineX]

Thanks! 🙂
Wow, that is impressively flat.
Almost don't need to use the Cal file at all.

Indeed just max 1 dB or so from 20-20khz 🙂 nothing much happening there 🙂