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RE: Any Tympani-IV / T-IVa owners? Working on mine, and mods

Here's where I'm at, I have the crossovers in their original phase configuration, but the modifications to the XO should operate with the phase set to midrange driver inverted, bass & tweeter normal polarity. But the stock T-IV crossover should have been Bass inverted, Mid & Tweeter normal polarity.

Overall I'm getting the best sound in with the crossover polarities as 'original' which leads me to believe the stock speaker construction was flawed by a phase/polarity error.

Here is a screenshot of my room measurements. Both channels look nearly the same as this. Keep in mind this is in a room with no treatments, and speakers are not ideally located, they are very close to the front wall in the room. Still less than +/-6dB of error, mostly due to room reflections or cancellations at the top/bottom ends.





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