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In Reply to: RE: Foil vs Wire: What difference does it make? posted by triamp on December 27, 2022 at 03:23:49
I think that would be true about delamination, but it really hasn't been a problem since they introduced the new adhesive 20 years ago. (My bass wires are starting to come loose again, though -- #*(@&.)
One thing I haven't seen mentioned is diaphragm damping. There is less diaphragm noise from the foil. Parts of the diaphragm are less likely to go out of phase, too (Mylar dragged behind the conductors).
The main differences in the XO were because they went from higher order parallel to first order series crossovers, not because of the foil.
Follow Ups:
"The main differences in the XO were because they went from higher order parallel to first order series crossovers, not because of the foil."
What I find interesting is that the 1.6 has a very distinct 4dB dip centered at 600Hz, while the 1.7 has a 2dB hump centered at 425Hz. Of course that is the electrical response based on a computer circuit analysis and how that translates to the in room acoustic response I haven't tested. Maybe I'll get a calibrated mic and give it a try.
All the factors discussed in this post could certainly be the reason there is such a different shape to the filter in the ~500Hz (about a 6dB difference) region.
I haven't opened up the 1.7s, but if I did it would be interesting to measure the response of the two different raw bass drivers of wire vs foil for comparison. I'm just not sure how I would do that to get any accurate data below ~300Hz. Using a calibrated mic and something like REW do you have any suggestion on how I would do that with a big dipole driver? Thanks Josh.
-Joe
They're not that big!
Speakers like Magnepan need to be measured at a distance. The response varies a bit over the driver(s). Measuring at a distance will include the room... You will need to measure the two speakers in exactly the same spot and with the microphone in also in the same spot.
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