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The main thing I hope to discuss, is to understand how an active crossover is better / worse than a passive crossover. The biggest question I have is about whether an active crossover has better phase coherence - or not - than a well designed passive crossover.
My thinking is that the 2x4 HD is an ADC/DAC - which obviously has its affects - but once the music signal is zeros and ones - it would seem that filtering can be done without affecting the phase of the output on the other side of the DAC. Can someone enlighten me on this, please?
The ability that an active crossover has to make fine tuned changes like shifting the crossover points by 5-10 Hz at a time, until things gel. I should mention that the Linaeum TLS tweeter is crossed in at 440Hz, and I have the Dayton Audio RS225P-8A crossed out at 400Hz. I had it at 410Hz for a while, and vocals were just a bit too congested. I will live with 400Hz for a while, and then maybe try it at 390Hz.
And the driver filters are amazing - you can aim for perfectly flat response, if you want to. The TLS tweeters are about 10dB louder than the woofer, so even though it rolls off a lot above 10-12kHz, it can be made nearly perfectly smooth. I have gone with a "house curve" which is a mild Harman curve. Flat between 200Hz and 1kHz - below 200 rises 1dB/octave (so +3dB at 20Hz) and it drops by 0.5dB/octave above 1kHz )so that is -3dB at 20kHz).
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