That last bit is important. In fact I avoid A/B testing generally because I think if an improvement is slight enough I need to go back and forth, it isn’t worth spending money on. Any upgrade should be a night-and-day difference for the price of gear.
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Make sure you have optimized your setup and room each time before you upgrade gear and again after any upgrade. Change only one thing at a time, and slowly, so that you can do this properly.
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When you decide you want to buy something, wait six months and see if your priority changes during that time.
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Listen to the music and try not to listen to the equipment. Make improvements only to the extent they help you enjoy the music more and not just because the equipment sounds better.
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Do not buy new gear unless you have auditioned it at home first. Used, different story.
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Umm, no. Every crossover point is actually a range of frequencies over which both drivers are operating. They must operate in phase and in a time alligned manner. The crossover components themselves introduce phase changes that are frequency dependent, so this is anything but simple.
And even if you get all that perfect, the drivers interact with each other as their wavefronts propogate. Those wavefronts have different dispersion patterns, and so their reflected energy is not balanced in the same way as their direct energy.They interact inside the cabinet as well.
The perfect speaker would be a single driver. This is part of the allure of panel speakers, although the PERFECT speaker would be a single, point-source, infinitely small driver.
This sort of problem stopped happening to me after I got s power regenerator.