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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: More posted by Dawnrazor on August 13, 2010 at 19:47:08:
I just finished the battery test. Every damn D & C battery in this house, 10 in series, could not force the tweeter to visibly move. The mid/bass can be observed (slightly) with just 5. Then, I remembered the cordless tool batteries. Bingo! A 18v drill bat, placed on the tweeter, did enough that I was able to see the mid/bass section next to it move. It moves in the opposite direction.
Indeed, I had the names wrong. I was using the correct & proper polarity between drivers but calling them the opposite of what they really are. The factory setup is to have the panel polarity inverted. That is what the blue line in the chart really represents. That is the reason why it is flatter.
Tracing back to the xover boxes, revealed a cable segment set that was inverted there. Theses boxes are not the normal ones used for bi-amp. I dusted them off for the Razoring tests. So, I must have had this in error for a while. The habit of making a frequency scan after setup changes hid the truth from me after the system achieved a "predictable sound". If a scan showed a non-linear response and it was fixed by inverting, that was usually "it", as long as the expected sound balance & imaging returned. Along the way, I lost track of the proper name for "it".
Bummer, I've gotta check and revise descriptions in some of those scans of speaker-level xovers that survived the hard drive crash. Also, I have to edit postings where this type of polarity may have been mentioned ...starting with the chart above.
My apologies to all who may have been mislead by my stupid oversight.
BTW, D, the plate thing only called my attention because -- assuming all MMGs have that same plate -- the speaker wiring shown is at odds with the schematics shown below it. See, the Blue wire on the schematics comes from the (-). Yet, the Blue wire on the speaker wiring comes from the (+) location (at least, where the (+) is in my plates).
Y'r right about the quickie, D! :-))
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Follow Ups
- I called them the wrong names - factory polarity is inverted for MMG panels - JBen 21:26:19 08/13/10 (1)
- RE: I called them the wrong names - factory polarity is inverted for MMG panels - pictureguy 22:59:31 08/13/10 (0)
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