JL is a better, cleaner amp. Eclipse seems a little tinny to me, but I hear they are finicky. You generally get what you pay for. Eclipse is a good amp. JL is an excellent amp. It's all which you prefer. Go to Tweeter and listen to them - they sell both lines. I have an Eclipse head unit, and it is the best value I have found. For amps and speakers, though, JL all the way.
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