Man I had no idea the difference they would make. I installed them as part of a store speaker build using the leftover 3.5" and 4" speakers with external mids and bass. This ensures the speakers aren't wasting energy creating those low tones that other speakers are processing. Namely as an unregulated high-pass filter. They are essential and I will use them when I upgrade the 3.5 inch speakers in my car.
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