Hello,
Same thing happened to me. Had my Pi4s for 10 plus years. I recently replaced my horn with the new Wayne horn (H90C and add the 16 ohm resistor) and forgot that in the B&C DE250 driver "red" binding post is the "-". I was listening and seemed that the sound and stage were out of focus. I knew something was wrong.
I use an "AudioTool" program from StudioSix called speaker polarity detector to detect polarity while playing a "speaker pop wav file". This tool sends pop-like sound to your speakers and using an iPhone, you can post the iPhone mic to each driver and it will tell you the driver's polarity.
Corrected, everything sounded very, very good. The improvement from the old to the newer horn is outstanding! Hard to explain but my speakers sounded like a much better pair. Thanks Wayne.
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