External Crossover


On the advice of SVS I changed my setting on my subwoofers from 50 hertz to 63 hertz. In addition, I turned the volume up. The change opened up the soundstage, more detail, better /more defined bass. Not a night and day difference, but easily heard. Now I'm looking into purchasing a JL Audio CD-1.
Two questions:
1. Are there other external crossover units that I should consider?
2. Should I expect similar results as when I changed the low pass filter from 50 hertz to 63 hertz with the external crossover?
ricred1

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